Hadron Expanse - Lysis system, Percival raids Moon of Hexis

In the Hadron Expanse, while the Imperium had made great advances on the world of Hexis itself, the chaos presence on the Moon of Hexis was a constant thorn in the side of General Konev. In 11.021M42 the Imperium didn't really understand what the Death Guard were even doing on the moon, and decided to send a strong force, led by the Stroganoff house of Imperial Knights, to find the chaos forces and destroy them.

Konev and his force expected the Death Guard base on the Hexis moon to be far less organised and well equipped than the one they encountered. In addition, they noted that the moon itself had started to change. Not only were the Death Guard well entrenched, but the very surface of the moon was clearly undergoing a daemonic transformation. Tentacles writhed from rocky outcrops and pools of hydrocarbons had morphed into lakes of puss and bile. Too late, the forces of the Imperium realised they had landed on an emerging daemon world.

The Knights, driven by their honour, charged into the Death Guard lines anyway. They found themselves continually battered by accurate and overwhelming firepower from Plagueburst Crawlers, as well as assaulted by the deamon prince Gavinus of House Eschar. Empowered by the daemonic energies the devotees of nurgle had unleashed on the moon, the Death Guard concentrated their fire on each knight one by one, overwhelming their shields and melting through armour.

The defeat of the knights precipitated an immediate withdrawal of all their supporting forces, who fled back to Hexis itself. Expecting the worst, Konev watched from the major planet as the moon took on a sickly green hue. On 0112.021M42 Fecus Major was born, a new daemon world dedicated to the worship of the god of decay. Then, without warning, the world blinked out of existence - disappearing from the skies of Hexis into the warp. Where it had gone, the Imperium did not yet know, but the threat of chaos invasion of Hexis now seemed to be over.