Astartes launch major assault on New Cerberex

In the recent history of the Zadoc Subsector, the xenos empire of the Tau proved a tenacious and calculating foe. Entrenched within the dense stellar shoals of the Mabb Nebula, their forces maintained defensive supremacy across multiple theatres, most notably upon the contested worlds of Hylas and New Cerberex. There, Imperial offensives faltered, grinding into prolonged stalemate as supply lines strained and attrition mounted.

Upon Hylas, Lord General Van Dorn marshalled his regiments for a renewed assault, seeking to break the deadlock through overwhelming force. Yet while the Astra Militarum prepared for war in the open, the Adeptus Astartes enacted a more decisive stratagem upon New Cerberex.

The Fall of New Grasx

By 0204.026.M42, the arrival of the Sky Lords Chapter bolstered Imperial strength, and a coordinated strike was authorised. The Dark Angels, ever secretive in purpose, led the assault upon the city of New Grasx—an urban stronghold believed to be lightly defended.

Initial reports confirmed minimal resistance. The Astartes advanced with disciplined precision, securing districts with alarming ease. Yet this absence of opposition was no boon—it was design.

New Grasx had been abandoned as bait.

The true objective of the campaign soon became apparent: the encirclement and subsequent siege of New Feducia, a heavily fortified Tau bastion of strategic and logistical significance. The Dark Angels’ advance had drawn them into position—but also into peril.

From hidden vectors emerged the Kel Sandros Aeldari, xenos allies of the Tau. Striking with speed and lethal grace, they sought to disrupt the encroaching Astartes before the noose around New Feducia could tighten.

What followed was a brutal clash of doctrines—Aeldari finesse against the implacable might of the Adeptus Astartes.

The Dark Angels responded with characteristic ruthlessness. Terminator squads were deployed into the heart of the engagement, their tactical dreadnought armour rendering them all but impervious to the Aeldari’s initial volleys. The confined urban terrain negated much of the Eldar’s mobility, forcing them into a grinding confrontation they could not sustain.

It was, by all accounts, a slaughter.

Yet the Aeldari did not break entirely. In a final act of defiance, a lone Fire Prism grav-tank executed a daring rearguard action. Plunging through withering bolter and plasma fire, it struck directly into an advancing Space Marine squad, scattering their formation and buying precious moments.

That sacrifice allowed the remaining Aeldari forces to withdraw into their webway portal, vanishing from realspace before annihilation could be completed.

By 0404.026.M42, New Grasx was firmly in Imperial hands.

The Assault on Suter

While the Dark Angels secured their foothold, the Sky Lords enacted a rapid strike operation upon the world of Suter—an engagement defined by speed, precision, and calculated risk.

Critical to the operation were a number of sacred Adeptus Mechanicus devices deployed from orbit. These artefacts—designed to disrupt and override Tau automated defence networks—had been scattered across hostile territory, their landing zones compromised by enemy proximity.

The Sky Lords did not hesitate.

Executing high-velocity insertion assaults, they struck deep behind Tau lines, engaging in swift and violent skirmishes to reclaim the Mechanicus assets before the enemy could react. Despite taking notable casualties in these engagements, the Chapter’s relentless tempo denied the Tau any opportunity to consolidate or counterattack effectively.

Within hours, the devices were secured and activated.

The effect was immediate and catastrophic for the Tau defenders. Automated drone networks faltered, defensive emplacements were silenced, and coordinated resistance collapsed into fragmentation.

With their technological advantage nullified, Tau forces on Suter were unable to maintain cohesion against the advancing Astartes.

By 0504.026.M42, Suter had fallen.

The Encirclement of New Feducia

In the wake of these twin victories, the strategic situation shifted decisively in favour of the Imperium.

With New Grasx secured and Suter neutralised, Astartes forces converged upon New Feducia, sealing its approaches and severing its supply routes. The Tau stronghold, once a lynchpin of their control within the Zadoc Subsector, now stood isolated—encircled by the Emperor’s finest.

Thus began the Siege of New Feducia, a campaign that would determine the fate of the Mabb Nebula and the wider war for the subsector.

Hadron Expanse 03.026M42

By 03.026.M42, the Tyranid threat within the Hadron Expanse had escalated to catastrophic levels. What had once been a creeping infestation had now become a full-scale planetary consumption effort, as elements of Hive Fleet Poseidon expanded their grip across multiple warzones simultaneously.

The Fall of the World Eaters on Haven

On the war-torn world of Haven, the Tyranids encountered a substantial warband of the World Eaters, whose presence had previously complicated both Imperial and Ork operations. The resulting engagement was savage and unrelenting, even by the brutal standards of the XII Legion.

Yet for all their fury, the World Eaters were no match for the sheer scale and adaptability of the swarm. The Tyranids annihilated the warband entirely, leaving no survivors and conclusively establishing their presence on Haven as a permanent infestation. From that point onward, the world ceased to be merely contested—it became a feeding ground.

Crisis on Helos Majoris

Simultaneously, the situation on Helos Majoris deteriorated rapidly. Tyranid forces launched a major offensive, breaching deep into Imperial defensive lines that had already been weakened by months of attrition.

The Astra Militarum bore the brunt of the assault. Entire formations were destroyed in the fighting, with one regiment reportedly reduced to a single surviving Rough Rider, an anecdote that spread rapidly through Imperial channels as both a symbol of heroism and of impending disaster.

Despite inflicting heavy casualties on the Tyranid horde, the Imperium found little comfort in the toll exacted. The swarm absorbed the losses without hesitation, its numbers seemingly inexhaustible.

By mid 03.026.M42, Imperial forces had been driven back across multiple defensive zones, and the strategic situation on Helos Majoris was described in official reports as critical.

The Intervention of the Dark Angels

Relief came only with the arrival of the Dark Angels, who were redeployed to the front lines in a desperate attempt to stabilise the collapsing defence. In an exceptionally bloody series of engagements, the Chapter brought its formidable discipline and firepower to bear against the Tyranid advance.

The fighting reached its climax in the closing days of the month. In a hard-fought defensive action, the Dark Angels succeeded in halting the Tyranid offensive, inflicting enough damage to force the swarm into temporary withdrawal and stabilising the Imperial line.

Strategic Collapse Looming

Yet even this victory could not mask the grim reality:

• By the end of 03.026.M42, the Tyranids controlled approximately half of Helos Majoris.

• Hive Fleet elements had begun appearing within the Hecate Gap, threatening Imperial positions from the rear.

• Supply lines were under increasing pressure, and Imperial forces were stretched to breaking point.

The question of strategy now came to the forefront. Increasingly, senior Imperial officers and sector authorities began to question General Maximus’s refusal to withdraw from the Rifts of Hecate. What had once been a bold forward strategy was now being seen by many as a potential overextension—one that risked encirclement and total collapse.

By the end of 03.026.M42, the Imperium still held Helos Majoris—but only just. The Tyranids had not been defeated. They had merely been delayed. And in the Hadron Expanse, delay was rarely enough.

Imperium grind to victory on Mordecai Prinaris

In the opening months of 026.M42, the war for Mordecai Primaris entered a decisive phase. The grinding attrition that had defined the previous year began to shift in favour of the Imperium, as General Kutuzov leveraged not only numerical superiority, but the direct intervention of some of the Emperor’s most elite warriors.

The Grey Knights and the Fall of the World Eaters

The first major turning point came with the deployment of the Grey Knights into the northern hive sprawl. Tasked with eliminating particularly dangerous Chaos elements, they engaged a warband of the World Eaters entrenched within the shattered hab-zones.

The battle was ferocious even by Astartes standards. At its height, a towering Khorne Lord of Skulls carved a bloody path through the Grey Knights’ ranks, annihilating multiple squads and threatening to break the Imperial assault. Yet the daemon engine’s rampage was ultimately halted by a determined counterattack from a formation of Grey Knight Paladins, who brought it down in a brutal close-range engagement.

With their war engine destroyed, the World Eaters force collapsed, their berserk fury insufficient against the disciplined might of the Emperor’s daemon-hunters.

Custodian Intervention

Following this victory, the Adeptus Custodes were committed to further offensives within the hive sprawl. Their engagement with a Chaos Space Marine force proved no less costly. The fighting devolved into savage, close-quarters combat within the ruins, where even the golden warriors of Terra were forced to pay in blood.

Despite the intensity of the resistance, the Custodes prevailed, breaking the Chaos line and forcing yet another withdrawal. Each such victory tightened the noose around the remaining Chaos strongholds.

The Fracturing of Chaos

As defeats mounted, the already tenuous alliance between the various Chaos factions began to unravel. Rivalries, long suppressed by necessity, erupted into open conflict.

The most dramatic rupture came from the Night Lords, who turned against their supposed allies, denouncing their leadership as weak and incompetent. What followed was a series of brutal internecine clashes:

• Night Lords forces struck first against the Death Guard, defeating them in a vicious engagement.

• Emboldened, they then turned on the World Eaters, overcoming them in another savage confrontation.

These internal conflicts further weakened Chaos resistance across Mordecai Primaris, accelerating Imperial gains.

Strategic Concerns

Yet the situation was not without its dangers.

While the collapse of Chaos unity benefited the Imperium in the short term, Kutuzov and his high command recognised a growing threat. The Night Lords, through their victories, risked emerging as the dominant Chaos force on the world—one capable of imposing order where previously there had been only disunity.

Such an outcome would transform a fractured enemy into a more coordinated and dangerous opponent.

By early 026.M42, the Imperium held the initiative on Mordecai Primaris. The forces of Chaos were in retreat, divided, and weakened.

But as history had often shown, the servants of the Dark Gods were never more dangerous than when forged anew from the fires of their own destruction.

Excerpt from the Caitlen Station Conflict Ledger, Aleph Sector Strategic Archive

Recorded: Mid 026.M42

As 026.M42 progressed, the war within the sprawling void-ruins of Caitlen Station showed no sign of resolution. The installation remained a fractured battlefield of shifting front lines, where gains were measured in corridors and docking bays, and no single faction could maintain dominance for long.

Chaos Advances and Ork Resistance

Among the most aggressive actors were the Nemesis Claws, a Night Lords warband devoted to terror and opportunistic warfare. Through a series of calculated strikes, they succeeded in seizing additional territory from entrenched Ork warbands, carving out a temporary foothold in one of the station’s mid-tier industrial sectors.

Yet, as was increasingly common on Caitlen Station, no victory went uncontested.

The Four-Way Engagement

In what would become one of the most chaotic engagements of the campaign, a four-way battle erupted in the contested sector. Imperial Deathwatch kill-teams, Ork forces, the Nemesis Claws, and a small Votann Hearthkyn squad—seeking to exploit the instability for Federacy interests—collided in a brutal and confused firefight.

The engagement rapidly devolved into close-quarters carnage. The Orks surged forward with characteristic aggression, the Night Lords struck from shadowed flanks, and the Votann attempted to hold disciplined firing lines amidst the chaos. Into this maelstrom, the Deathwatch brought their specialist training and xenos-hunting expertise to bear.

Despite being outnumbered and surrounded by multiple hostile forces, the Deathwatch systematically eliminated their enemies. Through disciplined fire, coordinated strikes, and superior battlefield awareness, they emerged as the victors of the engagement, securing the sector in the aftermath.

Tyranid Incursion

The victory, however, proved fleeting.

Within hours, bio-signatures began to spike across the area. Elements of Hive Fleet Poseidon, already deeply embedded within Caitlen Station’s lower decks, surged upward in overwhelming numbers. The Tyranids fell upon the weakened Deathwatch force with relentless ferocity.

Even the elite Astartes of the Deathwatch could not withstand the sheer mass of the swarm. The position was overrun, and the sector fell swiftly into Tyranid control.

⸻

Strategic Assessment

By mid 026.M42, Caitlen Station remained firmly contested:

• Chaos warbands continued to expand opportunistically but could not hold ground against sustained opposition.

• Ork forces remained numerous and disruptive but lacked cohesion.

• The Imperium achieved tactical successes but failed to convert them into lasting control.

• The Tau–Federacy alliance operated cautiously, seeking advantage but suffering from limited presence.

• The Tyranids, however, continued to grow in strength with minimal strategic cost.

Of all the factions present, it was the Tyranid infestation that caused the greatest concern. Unlike their rivals, the swarm did not require supply lines, coordination, or strategic restraint—only biomass.

No force appeared close to securing Caitlen Station.

But increasingly, it seemed that if any power would ultimately claim it, it would not be by conquest — but by consumption.

Excerpt from the Zadoc Subsector War Annals, Segmentum Obscurus Command Archive Recorded: Early 026.M42

The opening months of 026.M42 brought no respite to the embattled Zadoc Subsector. Though large-scale offensives had temporarily abated, the region remained far from quiet. Beneath the surface, a shadow war of raids, sabotage, and probing assaults continued unabated, as each faction sought advantage while preparing for the next major phase of the conflict.

Imperial Consolidation

At the centre of Imperial operations, General Van Dorn spent the preceding six months consolidating his gains. Reinforcements had been steadily deployed, supply lines reinforced, and new staging grounds established across contested worlds such as New Cerberex and Hylas. Though no major offensive had yet been launched, it was clear to observers that the Imperium was preparing for a decisive campaign.

Chaos Raids from Fort Sparcos

While the Imperium gathered strength, the forces of Chaos—particularly those entrenched at Fort Sparcos—remained highly active. Two major raids launched from the fortress demonstrated both the reach and volatility of the traitor warbands.

The first, carried out by the Thousand Sons in concert with large numbers of Tzaangor war-beasts, struck the T’au outpost on Tyndareous. The assault came without warning, emerging from warp-distorted vectors that bypassed conventional detection. The T’au defenders were caught completely unprepared. The resulting engagement was brief and devastating: the garrison was massacred, supply depots were obliterated, and critical infrastructure was left in ruins. By all accounts, it was a highly successful raid, dealing a significant logistical blow to the T’au presence in the region.

The second raid, however, proved far less effective.

A strike force of Night Lords attempted to infiltrate the Ork-held world of Bothorion, likely intending to destabilise the greenskin presence or carve out a foothold amidst the chaos. Yet the VIII Legion’s reliance on terror and stealth faltered against the crude but brutally effective vigilance of the Orks. The greenskins detected the infiltration earlier than anticipated, and what followed was not a calculated strike—but a slaughter.

The Night Lords were overwhelmed by sheer Ork aggression, their tactics rendered ineffective in the face of relentless close-quarters combat. Only a handful of the traitor Astartes escaped the disaster, fleeing into the void with their numbers shattered.

By early 026.M42, the situation in the Zadoc Subsector remained finely balanced. The Imperium prepared for a renewed push, the T’au struggled to recover from sustained disruption, and Chaos continued to lash out unpredictably from its strongholds.

The war had not paused—it had merely shifted into the shadows, where each strike, each raid, and each failure would shape the battles yet to come.

Caitlen station 12.025M42

Excerpt from the Caitlen Station War Record, Aleph Sector Archive

Recorded: 12.025.M42

In the final month of 025.M42, violence continued unabated across the vast, labyrinthine corridors, docks, and sub-structures of Caitlen Station. The shattered megastructure, already fractured by years of neglect and infestation, had become a shifting mosaic of short-lived victories and brutal reversals, where no faction could hold territory for long.

Skirmishes in the Inner Decks

Imperial Astartes strike elements—operating without heavy support and cut off from sustained reinforcement—launched a successful purge against a Death Guard patrol in the station’s inner maintenance levels. The engagement was swift and brutal, with the Plague Marines annihilated in close-quarters combat and their corrupted war-gear destroyed.

For a brief time, the Space Marines secured a series of strategic junctions and access corridors, marking one of the few clear Imperial victories within the station’s interior zones. The victory, however, proved fleeting.

Within days, a roving Ork warband surged through the same sector. Overwhelming the depleted Astartes force through sheer numbers and ferocity, the greenskins drove the Space Marines from their newly claimed objectives. The Orks seized the area in a storm of violence, looting equipment, fortifying scrap barricades, and transforming the corridors into crude strongpoints.

The Federacy Consolidates

Elsewhere on Caitlen Station, the Tau–Federal Alliance adopted a markedly different posture. Rather than committing to direct confrontation, Federacy forces—primarily Votann Hearthkyn elements—conducted organised training exercises within their secured zones. These drills focused on void-combat manoeuvres, corridor clearing, and rapid redeployment tactics, suggesting long-term strategic intent rather than short-term opportunism.

Imperial intelligence interpreted this as a sign that the Federacy was preparing for sustained operations on the station, rather than mere raiding or looting.

⸻

By the end of 12.025.M42, Caitlen Station remained a fragmented and contested battlefield. Control shifted constantly between factions, with victories measured in corridors and junction nodes rather than sectors or decks. No single power dominated the installation, and every gain was temporary.

The station had become not a prize to be seized—but a permanent warzone, where conflict itself was the only constant.

Tyranids breach Imperial defences

Excerpt from the Chronicles of the Rifts of Hecate, Segmentum Tempestus Archives

Late 025.M42

In the closing months of 025.M42, the Tyranid menace surged once more in intensity, marking a new and dangerous phase in the war for the Hadron Expanse. Confirmed elements of Hive Fleet Poseidon were detected within the Hecate Gap itself, signalling that the extragalactic invasion had breached what many Imperial strategists had believed to be a natural strategic barrier.

The Fall of the Plague Gambit on Haven

On Haven, the Death Guard had established a presence with a singular purpose: to unleash warp-tainted plagues in the hope of both halting the Tyranid advance and disrupting Imperial and Ork operations in the region. True to the nature of the XIV Legion and their patron god, the campaign was as much ritualistic as strategic, driven by Nurgle’s creed as much as by military logic. Yet the gambit failed.

Hive Fleet Poseidon proved utterly resistant to the latest pathogen unleashed by the Plague Marines. The Tyranids adapted with terrifying speed, their bioforms showing no measurable degradation. Despite a stubborn and disciplined defence, the Death Guard were eventually overwhelmed and forced into withdrawal. In their wake, the Tyranids established a new infestation zone on Haven, marking the world as another node in the ever-expanding Tyranid biosphere.

The Breaking Point at Helos Majoris

At Helos Majoris, the situation grew even more dire. For months, General Maximus had defied strategic logic and repeated counsel, holding the world through sheer will, attrition warfare, and the sacrifice of Imperial manpower. Again and again, his forces had repelled Tyranid landings, preserving the planet as the central operational hub of the Rifts of Hecate Crusade. But the cost was becoming unsustainable.

By the final days of 025.M42, the pressure from Hive Fleet Poseidon had become relentless. Imperial formations were exhausted, depleted, and stretched thin across multiple defensive zones. In a rare and desperate escalation, the Adeptus Custodes were deployed to Helos Majoris—an unmistakable sign of the gravity of the situation.

The golden warriors fought with legendary ferocity, cutting down vast numbers of bioforms and holding key landing zones far longer than any conventional force could have managed. Yet even their intervention proved insufficient.

For the first time, Hive Fleet Poseidon successfully established a permanent foothold on Helos Majoris.

This moment marked a strategic turning point. The Tyranids were no longer merely assaulting the world—they were rooting into it. The primary base of operations for Maximus’s entire Rifts of Hecate campaign now stood under direct existential threat.

Strategic Implications

By the end of 025.M42, the situation was clear:

• The Hecate Gap was no longer secure.

• The Tyranids were immune to Chaos plagues and increasingly resistant to all forms of conventional containment.

• Helos Majoris, once the anchor of Imperial resistance in the Rifts, had become a frontline world.

• General Maximus’s refusal to withdraw had transformed a strategic stronghold into a potential Tyranid beachhead.

What had once been a campaign of containment had become a fight for survival.

The Rifts of Hecate were no longer a buffer zone.

They were becoming a Tyranid domain.

Helos Majoris defended again from Tyranid Menace

In the Hadron Expanse, the closing months of 011.025.M42 brought renewed turmoil as the Tyranid threat continued to swell unchecked across the Rifts of Hecate. Most factions had already begun a hasty and disorganised withdrawal from the region, abandoning worlds to the shadow of Hive Fleet Poseidon. In this chaotic vacuum, the Imperium stood out as the only power still mounting coherent resistance.

The Defence of Heloris Majoris

The strategic bastion of Heloris Majoris, long a lynchpin of Imperial operations deep within the Rifts, once again found itself targeted by Tyranid bio-fleets probing for weakness. A fresh landing of xenos organisms made planetfall in an attempt to overwhelm the fortress-world’s outer defences.

However, this time the Imperium reacted with decisive speed. A rapid strike by the Space Wolves intercepted the Tyranid vanguard. The Sons of Russ tore into the alien swarms with characteristic ferocity, their counter-assault shattering the landing force before it could take root. Within hours, the bioforms were purged, and Heloris Majoris stood secure once more.

Strategic Dispute Within Imperial Command

Yet the defence of the world reignited long-standing divisions within Imperial High Command regarding the future of the campaign in the Expanse.

The Lord Sector Commander argued for a controlled withdrawal, abandoning exposed holdings and consolidating the Imperium’s strength at the critical choke point of the Hecate Gap. He insisted that worlds such as Haven and Ergura’s Fall could form a defensible redoubt should the Tyranids surge further outward.

General Maximus, by contrast, urged continued expansion and exploitation within the Rifts. He insisted that controlling worlds like Heloris Majoris provided not only valuable resources but strategic depth. His critics, however, suspected his motives. Rumours whispered through command chambers that Maximus sought personal glory more than sound military outcomes.

For now, Maximus’ argument prevailed. Heloris Majoris remained in Imperial hands, held through Space Wolf valour and political inertia—but the question of whether the Imperium should stand or fall back in the Expanse remained bitterly unresolved.

The Tyranid threat was growing, and every passing month narrowed the margin for error.

Xenos infestation worsens at Caitlen Station

The fighting across Caitlen Station escalated sharply in 11.025.M42, as multiple factions continued their attempts to secure or plunder the sprawling, half-derelict installation. What had begun as scattered skirmishes had by now become a full-scale free-for-all, with every major power in the Aleph Sector committing elite teams to gain even a sliver of control.

Kasrkin Insertion Efforts Collapse

The Imperium’s most significant commitment came in the form of several Kasrkin insertion teams, dispatched by General Van Dorn in a desperate attempt to stabilise the situation. However, these elite shock troops found themselves ambushed repeatedly across the fractured decks and drifting hab-moons of Caitlen.

One team was overrun by orks, whose ferocity and sheer weight of numbers smashed the Guardsmen before they could consolidate their landing zone. Another squad was intercepted by kroot mercenaries operating under the Federal–Tau Alliance. The kroot’s ambush tactics and unmatched close-quarters lethality shredded the Kasrkin before extraction could be attempted.

The worst blow came when yet another insertion team was destroyed by the Nemesis Claws, a warband of the Night Lords active throughout the station’s darkened hulls. The traitor marines cut down the storm-troopers with clinical brutality. Their bodies were never recovered.

By the end of the month, the entire Kasrkin operation was deemed an unmitigated disaster, with near-total losses and no territorial gains. It was a catastrophic waste of Imperial special-forces assets.

Tyranids Push Back the Federacy

Elsewhere, the Tyranid infestation—long entrenched within the station’s labyrinthine structure—erupted into renewed activity. Two separate engagements saw the bioforms overwhelming Votann Hearthkyn teams of the Federacy. The Votann had made modest early gains, but the sudden counter-surge of ravenous organisms forced them back, costing them both ground and personnel.

Despite inflicting heavy casualties on the xenos creatures, the Votann position became increasingly precarious.

Chaos and Tyranids Ascendant

By the end of 11.025.M42, a grim strategic picture had emerged:

• The Tyranids controlled large sections of the industrial belts and waste caverns, with minimal expenditure.
• The forces of Chaos—primarily the Night Lords and Death Guard—held the second-largest share of the station, having achieved their gains with ruthless efficiency.
• The Tau–Federal alliance had secured a foothold, but only after paying a steep price in troops and matériel.
• The remaining factions, from the Imperium to various xenos raiding forces, had failed to secure meaningful control of any major installation.

For the Imperium in particular, the outcome was disastrous. Elite troops had been sacrificed in failed insertions, and no strategic advantage had been achieved. The month ended with Caitlen Station more contested than ever—yet increasingly dominated by those who expended the least to claim it: the Tyranids and the servants of Chaos.

Mordecai offensives bolstered by Space Wolves

After a brief lull in frontline activity across Mordecai Primaris, the Imperium resumed its advance in the latter months of 025.M42, driving deeper into the shattered expanse of the planet’s northern hive cities. The oppressive heat of the long Mordecai summer had finally begun to break, and with it came renewed pressure from Segmentum Command for General Kutuzov to maintain operational momentum.

At the forefront of this renewed offensive were the Space Wolves, unleashed by Kutuzov to fracture the Chaos defensive line and create the necessary breach for the Imperial Guard to follow. Their assault was brutal and direct, cutting into plague-choked avenues and fortified hab-blocks with characteristic ferocity.

The Imperium’s sudden resurgence forced the Thousand Sons into a reluctant intervention. The sorcerous legion had long maintained their principal citadel deep within the northern hives, and its fall would represent a catastrophic loss for the Chaos forces on Mordecai Primaris. Thus, they moved to check the Wolves’ advance.

The Thousand Sons deployed their elite Scarab Occult Terminators, phalanxes of warp-armoured warriors whose inexorable advance had crushed many previous Imperial offensives. Their arrival threatened to halt the Space Wolves’ momentum entirely. Yet this time the blow fell not upon unprepared mortal troops but upon the Vlka Fenryka themselves.

The Space Wolves absorbed the initial psychic and bolter barrage with sheer tenacity, anchoring their line around their pack leaders and countering with devastating charges. What should have been a surgical counter-attack by the Scarab Occult turned into a grinding melee that failed to deliver the decisive breakthrough the Thousand Sons required.

Realising too late that the Imperium’s encircling manoeuvres were already in motion, the Thousand Sons were faced with a dire choice: continue the attack and risk the annihilation of their elite terminator formations, or abandon the field. The Thousand Sons withdrew under a shroud of sorcerous misdirection, preserving their forces but conceding valuable ground.

By the end of late 025.M42, the Imperium had driven significantly closer to the main Thousand Sons citadel, and the Chaos line in the northern hives was beginning to bend under the weight of sustained Imperial pressure. The long campaign for Mordecai Primaris was far from over, but the tide—slowly, inexorably—was beginning to seem indicate inevitable victory for the Imperium.

Caitlen Station: Imperium fightback

+++Excerpt from the Aleph Sector Strategic Annals, Vol. MMXLII Segmentum Obscurus Archive Record: 11.025M42+++

By 11.025M42, the Imperium could no longer disregard the escalating violence consuming the labyrinthine expanse of Caitlen Station. Long neglected and strategically vital, the station’s sudden eruption into a multi-faction battleground threatened to upset the already-fragile balance of power in the Aleph Sector. Recognising the looming danger of Chaos, xenos, or renegades securing the installation, General Van Dorn authorised an emergency deployment of Imperial insertion teams.

Krieg and the Ecclesiarchy Respond

In the absence of seasoned Astartes or elite kill-teams, Van Dorn assembled a makeshift force primarily composed of Krieg Grenadier squads, bolstered by a number of Ecclesiarchy Sanctifier teams—zealous warrior-clerics whose enthusiasm far exceeded their formal military training.

The Krieg detachment, operating with characteristic precision, made planetfall across the battered docking causeways of Caitlen Station’s outer rings. Their first major contact was with a splintered band of Necron constructs, likely tomb-theta maintenance drones left active from prior incursions. The Krieg forces executed a disciplined assault, neutralising the Necrons with methodical volleys of plasma and demolition charges. With the xenos threat pacified, they established a rudimentary forward command post—one of the first stable Imperial footholds on the station in years.

The Fate of the Sanctifiers

The Sanctifiers, dispatched on a parallel route to secure an adjoining cargo vault, met a less fortunate fate. Moving without the discipline or equipment of the Death Korps, the Ecclesiarchy-led force blundered into a hunting party of Kroot operating under the wider T’au Alliance presence.

The resulting clash was short, brutal, and chaotic. The Sanctifiers’ fervour was no match for Kroot pack tactics, and contact with the team was lost less than thirty minutes after their initial engagement. None returned. Imperial analysts grimly noted that Kroot dietary practices made their ultimate fate all too clear—the Sanctifiers were presumed killed and consumed.

Tyranid Infestation Persists

Even as Imperial forces attempted to regroup, the infestation that had plagued Caitlen Station for months continued to manifest. A small but elite team of Aeldari Corsairs, seeking to retrieve artefacts from a derelict armoury node, found itself ambushed by Tyranid bioforms lurking in the ventilation stacks. Although the Eldar cut down scores of the beasts with elegant precision, the swarm’s numbers were overwhelming. Vox-intercepts recorded their final moments—psionic static, splinter fire, and shrieks of chitin.

None of the Corsairs escaped.

Thus, by late 11.025M42, Caitlen Station had become an active warzone. The Imperium had secured a foothold, yet every corridor remained contested. Tyranids, Necrons, Kroot mercenaries, Chaos warbands, and more all stalked the shattered super-structure. The station’s fate—and the strategic future of the Aleph Sector—hung precariously in the balance.

Early gains for chaos at Caitlen Station

 +++Excerpt from the Chronicle of the Caitlen Reclamation, Segmentum Obscurus Archives, 025.M42+++

In the months of 10–11.025M42, the long-dormant void-colossus of Caitlen Station once again became the stage upon which the rival powers of the Aleph Sector declared their competing ambitions. Of these, the forces of Chaos were the first to make their intentions unmistakably clear. The arrival of several small but elite warbands—primarily elements of the Night Lords and Death Guard—marked the beginning of a renewed and methodical Chaos attempt to assert dominance over the fractured installation.

Night Lords Incursions

The Night Lords, ever preferring terror over subtlety, announced their presence with a vicious strike against a T’au scouting element. A lightly armed cadre of T’au Pathfinders, attempting to map one of the station’s derelict container warrens, was ambushed and eradicated. Despite the full application of T’au ranged discipline—markerlights, pulse volleys, and supporting drones—the VIII Legion warriors pressed through the fusillade with murderous purpose. The Pathfinders were annihilated in close combat, their final transmissions little more than screams and static.

Death Guard Advances

Elsewhere, a contingent of Leagues of Votann Hearthkyn, operating under Federacy sanction, attempted to probe deeper into the station’s lower armoury tiers. They encountered entrenched Death Guard elements, whose noxious resilience and inexorable advance quickly turned the engagement into a mire of attrition. The Votann, though well-equipped and disciplined, were eventually overrun, their position choked with corrosive fumes and plague-ridden munitions.

Tyranid Predation

At roughly the same time, General Van Dorn, seeking to reassess Imperial claims to the station, dispatched a small fireteam of Krieg Guardsmen. They progressed no further than the outer vent-shafts before the resident Tyranid infestation descended upon them. The Guardsmen fought with characteristic stoicism, but were swiftly overwhelmed and consumed. Their vox-logs ended abruptly, offering one more grim reminder that the biomass corruption of Caitlen Station remained very much alive.

Dark Eldar Misfortune

A separate Drukhari raiding party—believed to be a strike cell of Kabalite agents supported by Mandrake shadow-killers—attempted to exploit the chaos and plunder an abandoned weapons store. They instead crossed paths with a Night Lords kill-clade. The VIII Legion warriors surged into melee with savage delight, cutting down the Mandrakes before their shadow-tricks could avail them. The Drukhari force was destroyed almost to the last, their souls added to the terror-legion’s grim trophies.

Harlequins and the Votann

On the far side of Caitlen Station Primary, a Hearthkyn expeditionary team stumbled into an enclave of Aeldari Harlequins. Any attempt at diplomacy proved futile; the Harlequins dismissed the Votann with uncanny laughter and drew weapons in the same gesture. What followed was a bewildering whirlwind of motion. Even the formidable firepower of Votann auto-missile arrays could not pin down the capering xenos. A single Death Jester, dancing through the storm of rockets, accounted for multiple Hearthkyn casualties before the survivors disengaged.

By the end of 11.025M42, the status of Caitlen Station had deteriorated into a shadow war of unending skirmishes. No faction held clear control; all sought advantage. Yet the sudden, coordinated aggression of Chaos warbands had made one fact clear: Caitlen Station would soon become the next major battleground of the Aleph Sector’s ever-expanding wars.

Caitlen Station erupts in violence

By the latter half of 025.M42, as the wars of the Aleph Sector ground on without decisive resolution, the attention of many competing factions once more drifted toward the colossal void installation known as Caitlen Station. Once the pride of the Imperial Navy and the lynchpin of the strategic defence grid of the Zadoc Subsector, the station had—over decades of warfare, xenos incursion, and Imperial retreat—fallen far from its former glory. What had been a monumental fortress system had degraded into a lawless sprawl of shattered infrastructure, adrift in a system marred by neglect and predation.

Caitlen Station was never a single edifice but an immense conglomeration of void-facilities:

• Titanic drydocks capable of servicing battleships and grand cruisers.

• Vast container fields holding centuries' worth of matériel, much of it lost to record.

• Forgotten weapons vaults, some dating to the Great Crusade.

• An immense starfort, still half-functional despite millennia of piecemeal repairs.

These structures were spread across drifting planetoids, orbital rings, scattered platforms, and a dense mass of debris-fields that had once formed part of a coherent defence network.

In the wake of the Imperium's loss of much of the Zadoc Subsector, Caitlen Station had been abandoned to its fate, left to decay at the edge of civilised space. In the years that followed, it became a haven for scavengers, pirate enclaves, and warbands of every persuasion. By the time Imperial tacticians once again took an interest in 025.M42, the station was a morass of infestation and internecine violence. Tyranid bioforms, spawned from drifting spores and derelict bio-ships, nested in the internal superstructure; Ork freebootas prowled the docking caverns; and innumerable smaller bands—Traitor Astartes kill-clades, human renegades, and unknown xenos—vied for whatever spoils they could carve out.

Yet even in this state of ruin, Caitlen Station remained a prize too valuable to ignore. Its weapons caches contained relics of forgotten wars. Its hulked vessels could be stripped, reconstructed, or cannibalised. Its remaining infrastructure, if secured, offered unmatched strategic advantage.

Thus, across 025.M42, the factions of the Aleph Sector dispatched small, elite infiltration teams into the labyrinthine depths of the station and its outlying facilities. Each sought a different objective:

• The Imperium, hoping to reclaim or at least deny crucial matériel.

• The T’au, seeking technology or safe harbour for future expansions.

• The Orks, eager simply for loot and a good fight.

• The Chaos warbands, drawn by both opportunity and the echoes of ancient corruption.

• Rogue Traders, pirates, and mercenary groups, each with their own ambitions.

These expeditions rarely encountered one another directly, for the station’s immensity allowed teams to vanish into the dark between bulkheads. But their actions—sabotage, scavenging, purges, and skirmishes—echoed through the station’s fractured ecosystems, creating a shifting battlefield of deception and opportunity.

Though no faction would claim full control of Caitlen Station by year’s end, the conflicts of 025.M42 ensured it remained a site of vital strategic interest—and a nexus of future confrontation. For in the Aleph Sector, ruins are never truly abandoned, and the shadows of Caitlen Station still promise wealth, power, and death in equal measure.

Chaos consolidate forces around Calliden

In the closing months of 025.M42, the forces of Chaos enacted a deliberate and coordinated withdrawal from the Hadron Expanse, consolidating their strength in the more defensible fastnesses of the Perseus Deeps. This manoeuvre, long anticipated by Imperial strategos but executed with characteristic unpredictability, marked a significant shift in the strategic balance of the region.

On Calliden, recently ravaged by conflict on multiple fronts, the Death Guard began a systematic purge of lingering Necron resistance. These automaton legions, reawakening in scattered pockets across the planetary crust, were methodically hunted down and eradicated by the Plague Marines. The Death Guard’s implacable advance left behind fields of virulent corruption, denying the Necrons any opportunity to reconstitute their forces.

Simultaneously, the Night Lords conducted a brutal counter-operation against an Aeldari strike force that had descended upon the system. The Eldar, likely attempting to sabotage the Chaos withdrawal and disrupt whatever darker schemes lay beneath it, were met with surgical and sadistic precision. The VIII Legion remnants successfully repelled the xenos intervention, preserving the wider strategic plan of the Chaos coalition.

With their route secured, the Night Lords then turned their efforts toward delaying the relentless Tyranid swarms advancing through the Rifts of Hecate. Though far from a true stand, their brutal holding actions bought precious time. Amidst this carnage, the Night Lords orchestrated their escape through an unexpected and grotesque vector: the Nurgle plague world Fecus Major.

Witnesses—few who survived with mind intact—reported that Fecus Major itself translated into the Calliden system after an arcane warp-ritual of prodigious scale. The diseased planet’s sudden appearance unleashed waves of empyric contamination and reality distortion, providing the perfect screen for the Night Lords’ withdrawal while further unbalancing the already volatile region.

By year’s end, the forces of Chaos stood entrenched across the Perseus Deeps, strengthened by their grim successes. The Hadron Expanse, meanwhile, was left in a state of catastrophic ruin, with Imperial, xenos, and Tyranid forces struggling amidst worlds made desolate by war, plague, and warp-born abominations.

The long-term consequences of this manoeuvre remain unclear—yet all Imperial tacticae agree: the Deeps grow darker still.

Welcome to the Aleph Sector

 

Welcome to the Aleph Sector 40k (universe) campaign. This is a sector wide "pick up and play" campaign which is largely narrative, but now has a number of specific theatres to cater for different campaign styles.

Sweeping conflict between Chaos and the Imperium in the Perseus Deeps is an ongoing and apparently endless struggle between the warriors of the Emperor and their hated traitors. The campaign theatre supports all 40k universe games including 40k, Kill Team, Battlefleet Gothic, AI and Epic. The main "campaign system" allows players to simply find an opponent, play the game then record the results with the GM - this generates "points", which the overall faction commander (or the GM if there isn't one), can spend on territory, strategic raids, fortifications or anything else feasible within the campaign. The larger the game - the more points, but the better your faction is doing gives you a bonus to your win. The Perseus Deeps is the main theatre of war in the sector, as it is close to the Cicatrix Maledictum and is key to the control of the sector.

More information on the "system" can be found here (you don't need to know any of this at all, but the GM (Duncan) works with faction commanders to make best use of their wins, and acts as an advisor, warning against strategically "unwise" moves - though is often ignored!)

In the Perseus Deeps and Zadoc subsectors the Tau, Imperium, Necrons, Orks and Chaos forces are battling one another for control over the region as the Tau launch their Perseus and Zadoc expansion sphere campaigns.

Meanwhile in the Hadron Expanse, the Tyranids, Orks and Necrons are seeking to pour through the Hecate Gap - a passageway through a set of warp storms that once sealed them off from the rest of the sector - while the imperium, chaos and Tau forces try to stop them, and the eldar try to seal off the region once and for all.

The whole map is however "live" and players who want to get into the narrative can drive their own plots and perhaps even trigger the next major theatre of war. Any and all games from matched play to one off narratives can be played - its as much as you personally want to make of it.

More information 

The Imperium

The Forces of Chaos

The Tau & Federacy

The Orks

The Necrons

The Tyranids

The Aeldari and Drukhari

And if you want background - there is a ton on this blog to delve into. The campaign has been running now since 2001, and the blog since 2006. In this campaign - there really is only war...

For a "current state" of the campaign check back to this blog. Autumn 2025 starts here: The Aleph Sector

The Aleph Sector 10.025M42

 Strategic Summary: The Aleph Sector in 025.M42
Segmentum Ultima – A Study of the Wars of Attrition and Expansion

By 025.M42, the wars raging across the Aleph Sector had entered a new and bloody phase. The conflict spanned dozens of systems, from the blighted worlds of the Perseus Deeps to the war-ravaged nebulae of the Zadoc Subsector and the monstrous horrors of the Hadron Expanse. No single faction held the advantage; every victory came at a ruinous cost, and every advance drew a counterstroke from one of the many enemies vying for supremacy in the region.

The Mordecai Campaign – The Steady Hand of General Kutuzov

On Mordecai Primaris, General Kutuzov continued his slow but inexorable advance into the corrupted hive cities of the Chaos-held world. Drawing on the Imperium’s strategic and logistical superiority, Kutuzov’s campaign had achieved a series of deliberate, grinding gains, supported by the combined arms of the Imperial Guard, Adeptus Astartes, and Imperial Knights.

Despite these victories, the resistance from Nurgle’s followers, particularly the Death Guard, remained formidable. The plague-ridden defenders fought with the tenacity of the damned, contesting every street and ruin, forcing the Imperium into a campaign of attrition that sapped men and materiel. Even as the Imperium secured major objectives such as Hamen Spaceport, it was clear that the liberation of Mordecai would be neither swift nor bloodless.

The Perseus Deeps – Veers’ Crusade and the War Against the Necrons

To the galactic north of the Mordecai system, in the Perseus Deeps, General Veers’ Crusade pushed ahead in a separate but equally critical theatre. Having successfully secured Enaloth, Veers now turned his attention to the Necron-infested worlds of Gamordal and Gamador. There, his Imperial forces clashed with the ancient dynasties of the Necrontyr, their tombs slowly stirring to full wakefulness after aeons of slumber.

The battles across these desolate worlds were defined by sudden ambushes, attritional engagements, and the slow wearing down of both sides. The Tau Empire, meanwhile, advanced from the galactic east as part of their so-called Perseus Expansion Sphere, bringing them perilously close to Veers’ line of operations. While both empires sought to expand, their ambitions risked colliding in the near future—a confrontation that could decide the balance of power in the Deeps.

The Zadoc Subsector – Imperial Resurgence and Tau Setbacks

Further spinward, in the Zadoc Subsector, the Tau Empire suffered a string of reversals following their earlier dominance. Under the leadership of General Van Dorn, Imperial forces had rallied and were now conducting a determined counteroffensive. The Dark Angels, who had long defended their bastion-fortress on New Cerberex, broke out in force, reclaiming large swathes of territory and threatening to roll back the Tau occupation entirely.

Meanwhile, the Federal Alliance—including contingents from the Leagues of Votann—remained bogged down on Hylas, locked in protracted battles against the Imperium and the unpredictable Ork incursions that plagued the region. Around the Mabb Nebula, a patchwork of smaller conflicts, covert raids, and sabotage operations continued to destabilise every front, ensuring that even minor victories were paid for in blood

The Hadron Expanse – The Tyranid Menace of Hive Fleet Poseidon

Beyond the Perseus front, in the distant reaches of the Hadron Expanse, a far greater terror was unfolding. Hive Fleet Poseidon continued its relentless consumption of worlds within the Rifts of Hecate, reducing once-thriving planets to barren husks. Neither the Imperium, nor the Tau, nor even the forces of Chaos had been able to halt the xenos advance.

Each world consumed by the Tyranids added to the swarm’s strength, and despite growing alarm across the sector, few powers could spare the resources to respond. Appeals for reinforcements were made across the Aleph Sector, but the great powers were stretched thin—locked in too many wars to adequately face the extragalactic horror that now threatened them all.

Conclusion – A Sector on the Brink

By the end of 025.M42, the Aleph Sector stood at a knife’s edge. The Imperium had regained ground in the Perseus Deeps and the Zadoc Subsector, yet its enemies multiplied and evolved. The Tau Empire still held much of the galactic east, the Necrons stirred to full wakefulness, and the Tyranids devoured the Hadron Expanse unchecked.

As the Emperor’s armies dug in across dozens of worlds, the question remained whether the Imperium’s divided strength could withstand the gathering storm—or whether the sector would fall, consumed by war, xenos, and the long decay of endless conflict.

— Extract from the “Tactica Alepha: A Strategic Analysis of the 025.M42 Campaigns” compiled by the Office of Imperial Command, Aleph Sector.

The Battle of Gamma-Omega-2571D – The Hammers of the Emperor, 09.025.M42

In the aftermath of the disastrous failure of the Aleph Wardens Mechanised Regiment, General Kutuzov faced mounting pressure to regain momentum in the northern hive sprawl of Mordecai Primaris. The costly defeat at Gamma-Omega-2571D had left Imperial morale shaken, and the district remained a critical bastion of the Death Guard line. Unwilling to commit more Guard formations to what was becoming a meat grinder of attrition, Kutuzov turned to the Adeptus Astartes.

The Hammers of the Emperor, a Chapter famed for its unyielding determination and willingness to wage prolonged campaigns of urban annihilation, answered the call. In early 09.025.M42, the Chapter committed significant forces to a direct assault on Gamma-Omega-2571D, aiming to break the Chaos hold where the Guard had faltered.

The opening phase of the battle saw the Hammers make gains on their left flank, where their elite melee shock troops – heavily armoured assault brethren – cut a swathe through the diseased cultists and plague marines guarding the ruins. On the right flank, however, progress was far slower. The Death Guard, entrenched in collapsed hab-blocks and fortified manufactoria, resisted with their usual inhuman endurance, forcing the Astartes to clear every structure at enormous cost.

The battle reached its climax when a formation of Death Guard Terminators arrived in the centre of the battlefield. These bloated monstrosities of corrupted ceramite dominated the fighting, shrugging off bolter fire and cutting through squads of Space Marines in brutal hand-to-hand combat. The Hammers’ advance stalled under their relentless assault, and the engagement devolved into a grinding struggle of attrition.

Yet the Hammers of the Emperor proved as stubborn as their foes. Refusing to yield ground, they locked the Terminators in a vicious stalemate, their resilience and faith in the Emperor preventing the collapse of their line. By 04.09.025.M42, the wider strategic situation forced the Death Guard to withdraw; Kutuzov’s Guard regiments had begun pushing into the flanks of the Chaos salient, threatening to cut off the defenders entirely.

The battle was officially judged a tactical draw, yet for the Imperium it was enough. Though the cost in Astartes lives was grievous, the Death Guard had been forced to abandon Gamma-Omega-2571D, and Imperial forces now pressed into the shattered streets.

The victory, however, carried its own grim warning. Progress would be slow and punishing – every street, every hab, every room in the ruins would have to be seized from plague-ridden hands. The road ahead for Kutuzov’s campaign on Mordecai Primaris promised only more attrition, more sacrifice, and more blood paid for every crumbling sector of the hive sprawl.

The Failure at Gamma-Omega-2571D – Mordecai Primaris, 07.025.M42

By the high summer of 025.M42, the war on Mordecai Primaris had slowed to a grinding stalemate. The northern hemisphere of the daemon-tainted world endured the full force of its red dwarf sun, which hung in the skies for over sixteen hours a day, irradiating the surface and baking the already desolate wastelands in a merciless heat. Conditions were brutal, yet Imperial High Command pressed for continued advances, fearing that any pause would give Chaos time to reorganise and reinforce.

The most intense fighting during this period took place amidst the sprawling ruins of the northern hives, where shattered hab-blocks and collapsed manufactoria provided natural choke points and strongholds for the defenders. In 07.025.M42, General Kutuzov committed the Aleph Wardens Mechanised Regiment to spearhead an assault on the ruined district of Gamma-Omega-2571D, a key sector whose control would have opened up new approaches towards the hive sprawls further north.

The Aleph Wardens, veterans of numerous campaigns across the Aleph Sector, deployed in strength. Their Chimeras and Leman Russ tanks advanced under heavy covering fire, their armour shielding them from the intense heat and radiation. However, their progress soon ground to a halt. Waiting for them in the shattered cityscape were the Death Guard, entrenched in the ruins with their usual doggedness. The corrupted legionnaires showed no signs of fatigue under the blistering sun, their rotting ceramite plate impervious to both the climate and much of the Guard’s firepower.

Worse still were the Death Guard Terminators, whose relentless counter-attacks and brutal close-range firepower repeatedly shattered the Imperial spearheads. The terrain of Gamma-Omega-2571D favoured the traitor elite; narrow avenues and crumbling ruins denied the Wardens the manoeuvrability of their armour, forcing them into grinding, attritional combat for which they were ill-suited.

Despite repeated attempts, the Imperial mechanised formations could make no meaningful progress. Casualties mounted, with dozens of tanks destroyed in ambushes or bogged down and abandoned in the rubble. Infantry losses were even higher, whole companies reduced to nothing in close-quarter battles against plague-ridden warriors who simply refused to die.

By the closing days of 07.025.M42, the assault was called off. The Aleph Wardens had suffered crippling casualties, losing a substantial portion of both men and materiel, while the ruins of Gamma-Omega-2571D remained firmly in Chaos hands. The effort had achieved nothing, save to demonstrate once again the immovable resilience of the Death Guard when entrenched in their chosen ground.

For Kutuzov, the failure at Gamma-Omega was a sobering reminder: while momentum had been with the Imperium earlier in the year, the path to total victory on Mordecai would be long and costly. Every ruined sector, every ash-choked hive, would have to be paid for in the blood and armour of the Astra Militarum.

The Western Breakout – Tau Gains on Zadoc, 05–06.025.M42

After suffering a number of tactical setbacks in 04.025.M42, including the costly chaos offensives at Chettalo and the northern plains of Zadoc, the Tau Empire reassessed and reinforced its positions around its established bridgehead on the world’s central continent. The importance of Zadoc—once a loyal Imperial world, now a chaotic battleground of competing factions—meant the Tau were unwilling to relinquish their claim in what they had designated a key node in their Perseus Expansion Sphere.

In 05.025.M42, Commander Malkaor launched a bold and sweeping westward breakout from the Tau-held bridgehead, aiming to change the tempo of the campaign and seize the initiative. The offensive was meticulously planned and executed with typical Tau precision, incorporating Hunter Cadres supported by mobile armour and air assets. The Biordeosta region, a critical logistical hub for the traitor forces, fell after a short but intense engagement.

The offensive then rolled into the rugged Appenine highlands, a heavily fortified and naturally defensible region. Expecting a prolonged and grinding conflict, the Tau commanders were surprised when the resistance—composed largely of chaos cultists and scattered traitor PDF—collapsed under sustained drone strikes, pulse fire, and flanking manoeuvres by mobile stealth units.

This manoeuvre proved decisive. With the Appenine highlands lost, chaos forces in northern Zadoc found themselves isolated and in danger of encirclement. Recognising the untenable position, the Chaos commanders ordered a hasty evacuation of Andiselie, abandoning valuable materiel and infrastructure to avoid annihilation.

By 06.025.M42, the Tau Empire had gained control of the majority of the central continent of Zadoc, establishing a network of forward operating bases and expanding their sphere of influence westward and north. This campaign marked the first significant strategic reversal for the Chaos forces on Zadoc since their initial invasion, and morale among the traitor ranks visibly faltered.

The success of the western breakout significantly altered the balance of power on the world. With their forces now in a strong operational position, and the chaos front lines crumbling, the Tau appeared poised to complete the conquest of Zadoc before the end of 025.M42—if they could maintain momentum and avoid retaliation from either Chaos reinforcements or the ever-watchful Imperium.

The war for Zadoc had entered a new phase—one where Tau dominance was no longer theoretical, but material, visible in the fire-lit skies above burning hive spires.

Mordecai: Imperium take Hamen

Following the costly victory at Hamen Spaceport, General Kutuzov wasted no time in pressing the advantage. With the Imperium’s foothold in the hive sprawl secured and the supply lines running through the wastelands behind him stabilised, the next strategic target was clear: the city of Hamen Hive itself. Intelligence suggested that the hive was now heavily fortified and garrisoned by elite elements of the Emperor’s Children, the corrupted III Legion, whose cruelty and martial prowess had already bled several Guard regiments dry in earlier phases of the campaign.

Recognising the need for overwhelming force to breach such a formidable objective, Kutuzov petitioned for Adeptus Astartes support. The call was answered swiftly by the Space Wolves, long-time enemies of the Traitor Legions, whose ferocity and disdain for static warfare made them an ideal tool for the task.

The assault began in the final days of 05.025.M42, heralded by a coordinated drop pod and Thunderhawk strike into the upper spires and mid-hive levels of Hamen. The 13th Great Company, led by Wolf Lord Brynjolf Stormfang mounted on his thunderwolf Greyhowl, spearheaded the assault. In a characteristic show of Fenrisian savagery, Stormfang led his pack from the front, shrugging off fire that would have crippled lesser warriors, and personally slaying multiple noise marines in brutal hand-to-hand combat.

The impact of the Space Wolves’ assault was immediate and devastating. The Emperor’s Children, for all their twisted devotion to excess and sensation, found themselves completely unprepared for the sheer physicality and unrelenting aggression of their loyalist cousins. Demoralisation spread quickly through the traitor lines as entire units were routed, their cohesion shattered by the Space Wolves’ shock assault.

Despite stiff resistance in some hab-blocks and underhive zones, by the early days of 06.025.M42, Hamen Hive had been brought under Imperial control. The few remaining Chaos defenders were either driven into the wastes or slaughtered without quarter.

With Hamen Hive fallen, the strategic doctrine of the campaign began to crystallise. Kutuzov, now with the advantage of numbers and a steady stream of reinforcements, would direct the Adeptus Astartes to break the hardest, most entrenched targets—elite formations, command centres, and key fortresses—while the massive Guard formations under his command would follow up to consolidate territory, cleanse the wider sprawl, and push into the surrounding wastelands.

The campaign for Mordecai Primaris was far from over, but the fall of Hamen marked a turning point. Chaos resistance had proven resilient, but the momentum was now firmly with the Imperium, and the full weight of the Imperial war machine was only just beginning to roll forward.

Van Dorn recaptures Laurier

By the end of 05.025.M42, the war for New Cerberex had shifted decisively against the T’au Empire. Following the initial setbacks and surprise defeats inflicted by the T’au during their counteroffensive in early 025.M42, the Imperium had rallied, exploiting the momentum provided by the Dark Angels’ brutal breakout to the south and now bringing the full weight of their military machine to bear.

The most significant reversal came with the recapture of the city of Laurier, a vital northern settlement and strategic node that had previously fallen to the T’au in a lightning assault. Now, under the direct command of General Van Dorn, multiple newly arrived Astra Militarum regiments were deployed to the front lines. These included hardened veterans of the Cadian 143rd and the brutal siege specialists of the Vornheim 66th, bolstered by PDF auxiliaries and artillery detachments.

The assault on Laurier was relentless. Over the course of four days, the T’au Hunter Cadre defending the city fought with typical xenos precision, executing textbook withdrawal manoeuvres and fire-and-fade tactics. However, the sheer volume of Guardsmen, combined with armoured spearheads and sustained aerial and orbital support, eventually overwhelmed the T’au defences. The city’s evacuation route was cut off by Scion drop forces, and by the end of the engagement, the entire Hunter Cadre was annihilated—either slain in battle or hunted down in the ruins.

With Laurier retaken, the Imperium now held the entire southern and central belts of New Cerberex, forming a secure front line and allowing for more efficient deployment of reinforcements via drop landers and bulk landers. This territorial control was critical: within weeks, dozens of additional Guard regiments were expected to deploy, further tipping the strategic balance.

Compounding the T’au dilemma was their deteriorating space superiority. Though the T’au fleet in the region remained intact and technically capable of contesting orbit, its commanders remained conspicuously passive. Intelligence reports suggested the reason was clear: Imperial Navy battlegroups—backed by known Space Wolves and Dark Angels fleet assets—were prowling the Mabb Nebula. The threat of a sudden and catastrophic fleet engagement loomed over any T’au attempt to assert dominance in orbit.

The T’au high command on New Cerberex now found itself isolated, outnumbered, and increasingly outmanoeuvred. The dream of converting New Cerberex into a bastion of the Perseus Expansion Sphere was fading fast, and the question was no longer how much ground the T’au could take—but how much they could possibly hold.

The Vespae Encounter

As the relentless advance of Hive Fleet Poseidon continued unabated through the fragmented region known as the Rifts of Hecate in 05.025.M42, the long-ignored xenos menace began to draw the attention of the Aeldari. For millennia, the Vespae system—an isolated world held in secret by the craftworlds and their outlying allies—had been warded and watched, considered a quiet node in the ever-changing tapestry of fate. That assumption would not survive the month.

When auguries detected subtle disturbances in the biosphere and anomalous psychic echoes from Vespae’s surface, the Farseers of Alaitoc dispatched a swift reconnaissance force via the webway. Comprised of elite Aspect Warriors and guided by a seer council, the group was reinforced by the deathless might of a Wraithlord and a unit of Wraithguard—an indication of the seriousness with which the Craftworld viewed the threat.

Upon arrival, the Aeldari forces encountered the unmistakable spoor and psychic shadow of the Tyranid hive mind. The planet was not yet overrun, but vast mycetic spores had already seeded the wilds, and the leading edges of the swarm had begun to manifest. The ensuing battle was short and brutal. The Aspect Warriors were torn apart by monstrous bioforms, and the webway ingress was almost overrun in minutes. Only the Wraith units, their necrodermis bodies resisting the corrosive tides of biomass and acid, managed to retreat to the safety of the portal—battered, silent, and grievously damaged.

The survivors brought with them fragments of alien tissue and data impressions—enough for the Farseers to confirm their worst fears. The Tyranid swarm on Vespae bore the genetic hallmarks of Hive Fleet Poseidon. Somehow, impossibly, tendrils of the fleet had slipped through the Hecate Gap undetected, bypassing major Imperial and Chaos positions and establishing an advanced beachhead in a region thought to be secure.

The implications were dire. Vespae lay within an area the Aeldari had long deemed strategically vital. If Poseidon was already present beyond the Rifts, then the entire Hecate Gap could collapse in a matter of months, with the hive fleet potentially striking deep into the coreward sectors of the Hadron Expanse.

The Aeldari councils fell into urgent and bitter debate. Should they intervene directly to halt the spread? Or, more dangerously, should they reveal what they had learned to the crude and squabbling factions of the Mon-Keigh, risking their own secrecy in exchange for a broader coalition against the xenos tide?

For now, the Craftworlds remained silent. But the shadow of the Great Devourer had fallen upon Vespae—and perhaps far beyond.

The Battle of Nepheru – Gamador Campaign, 05.025.M42

As the Perseus Deeps campaign dragged into the height of 05.025.M42, the Tau Empire escalated its efforts to secure the strategic world of Gamador. With the Imperium’s Crusade under General Veers advancing steadily and threatening to undermine the Tau’s Perseus Expansion Sphere, the Ethereal Caste demanded a decisive victory. The target was the Necron-held city of Nepheru—an ancient and heavily fortified urban bastion deep within the desert wastes, reachable only from the tenuous Tau bridgehead established at Hasmaker.

The offensive was led by elements of the Dal’yth and Vior’la septs, combining highly mobile Hunter Cadres with precision orbital support. The strategy was clear: strike swiftly, bypass Necron strongpoints, and collapse their defensive network from the inside out. However, what followed was anything but swift.

The approach through the plains of Nepheru was immediately hampered by hidden monoliths, burrowing Canoptek constructs, and sudden counter-assaults by phased-in Necron units. Tau supply lines were harassed relentlessly, while Necron forces, displaying uncharacteristic tactical unpredictability, launched suicidal charges and teleportation ambushes.

As the fighting reached Nepheru’s outer walls, the campaign descended into a brutal and methodical grind. The Tau achieved numerous local victories, deploying Stormsurge units and Battlesuit Enclaves to devastating effect, but every advance was met with withering gauss fire and the uncanny resilience of Necron reanimation protocols. The sky turned to ash with the heat of plasma fire and the shimmer of shielding technology flickering under siege conditions.

After weeks of attrition, the Tau managed to breach Hasmaker and establish full control over its ancient industrial platforms. Yet the cost was enormous. Several cadres had to be withdrawn due to unsustainable losses. Crisis Suit commanders were lost in action, and even the elite Stealth Teams suffered disproportionately as Necron counter-adaptations blunted their technological edge.

Despite their tactical victory, the Tau were left bloodied, overstretched, and burdened with a pyrrhic gain. The capture of Hasmaker solidified their presence on Gamador, but the Necron grip on Nepheru itself remained unbroken.

The battle proved a grim reminder that the Gamador campaign would not be won by rapid manoeuvre or clean battles. It was a war of ancient attrition, fought in forgotten cities and silent tombs where even the Tau’s vaunted efficiency struggled against the timeless endurance of the Necron menace. And all the while, the shadow of the Crusade under General Veers loomed ever closer.

Rising Greenskin Momentum

Segmentum Ultima – Aleph Sector Archives

Compiled by the Ordo Xenos, Watch Station Altaris

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Background: Rising Greenskin Momentum

By 05.025M42, the Mabb Nebula had become a cauldron of conflict. The Imperium, Tau Empire, and Chaos warbands had turned the region into a patchwork of overlapping warzones. Amid this chaos, the Orks, long considered background noise in the wider struggle, began to stir with terrifying energy. Drawn by the sound of battle and scent of bloodshed, Waaagh! energy surged, and the greenskins began to unify under a loose network of warlords across the nebula.

Two worlds would bear the brunt of this resurgence: Bothorion and Fort Sparcos.

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The Fall of Bothorion: Tau Dislodged

The world of Bothorion, a hostile, Ork-infested planet deep within the Mabb Nebula, had long hosted a covert Tau outpost. For several years, Tau operatives of the Fire Caste had used it as a staging ground for a slow infiltration and eventual full invasion. Their hope had been to one day bring Bothorion into the T’au Empire, cleansed of its feral Ork infestation.

However, with major elements of the Tau military diverted to critical battles on New Cerberex and Hylas, the garrison on Bothorion was left dangerously understrength.

In 05.025M42, the Orks struck. An unexpected mass assault, led by a coalition of warbands loosely aligned under the banner of a rising Warlord known only as Big Mek Kradzuk, overwhelmed the Tau installations. Fire Warrior cadres were torn apart in savage assaults, stealth drones neutralised by sheer weight of numbers, and even Crisis Suits were dragged down and dismantled by mobs of enraged Orks.

Within a matter of days, the Tau presence on Bothorion was eradicated. The carefully prepared outpost was razed, and the Ork Waaagh! momentum grew as warbands began to look outward from their long-ignored world.

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Brutality on Fort Sparcos: Orks versus Chaos

Meanwhile, on Fort Sparcos, a world already buckling under the strain of a multi-faction war, the Orks launched another brutal offensive. Previously fragmented into roving bands, the greenskins had recently coalesced in response to incursions by the Death Guard. The Chaos forces had been attempting to seize strategic locations across the ruined fortress-world, including the vital spaceport complex.

In a shock counterattack, the Orks not only defended their territory but launched a devastating assault on the Chaos-held spaceport. What followed was a pitched battle of horrific attrition, as plague-infested Death Guard clashed with rampaging Orks in brutal close combat.

Despite the resilience of the Plague Marines and their unnatural endurance, the ferocity and sheer weight of Ork numbers proved too much. Several Death Guard squads were overrun and hacked to pieces, while a full detachment of plague marines was wiped out during a final charge by Nobz and a heavily modified Deff Dread mob.

By the end of the conflict, the spaceport was entirely under Ork control, and Chaos forces were driven into the labyrinthine ruins, harried at every turn by roaring greenskins.

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Strategic Outlook

The Ork resurgence in the Mabb Nebula represents a critical new threat to all factions operating in the region. Their success on Bothorion and Fort Sparcos demonstrates a growing degree of cohesion and purpose—hallmarks of a Waaagh! approaching critical mass.

For the Imperium, the T’au Empire, and the Chaos warbands, this development poses a grim dilemma: continue to bleed one another in internecine wars, or divert resources to stem the rising green tide. For now, however, the Orks rampage unchecked, fed by war, and driven by nothing but the joy of battle.