Tyranids reach Mezria VI

While a large and confused conflict was escalating in the Lodax system, the tyranid menace was continuing to pursue its own alien agenda. Having consumed Candic Minor the first small hive ships had already been constructed, or birthed, and the hive mind began sending out vanguard forces to link up with its pre-seeded spores on other worlds within the Rifts of Hecate. The next world to fall under the hive mind's influence was Mezria VI, where the Imperium and orks were already fighting for control of the world.

two distinct strains of the tyranid genome arrived on the world at the same time, named by the Imperium as Poseidon and R'Lyeh. The former was relatively new, and it came as a surprise to the Imperium that the two strains of the tyranid creatures immediately began fighting with one another. Initially this gave observers cause for hope. Perhaps the hive mind wasn't unified at all, and would fall into infighting as with other alien enemies such as the orks. However, as the warriors of Poseidon overcame their brethren in R'lyeh, the biomass of the latter was added to the former, leading to an even more evolved next generation of creatures. The tyranids had not been infighting to their detriment, but to determine the best combination of genetics to perfect their living weapons.

And so when Hive Fleet Poseidon fell upon the orks on Mezria VI, the Imperium looked on in horror and dread as the greenskin army that moved to meet the alien invaders was swiftly massacred by the xenos creatures. Carnifexes charged into a mighty Stompa, ripping it apart in mere minutes, while the rest of the orks were overwhelmed as their own charge faltered. Few greenskins escaped the massacre and the tyranids were now entrenched and staring down on the imperial garrisons as well.