User:IllumiNini/Sandbox 2

Hailing from the Death Guard Legion following the Horus Heresy, the Bilious Defilers have a reputation for being among the most fearsome warbands to call themselves sons of Mortarion. Despite their reputation, they have been know to manipulate fear tactics as well as shadows and illusions, thus making them an oddity among their plagued brothers.

During the times they have been seen across the millennia, it has been noted that they have targeted both heavily populated worlds and mortuary worlds to the near-exclusion of all others from their sights.

The Great Defilement (Unknown Date.M33)
During their first major campaign into imperial space, the warband made their way into a system with both a hive world and a mortuary world. Their goal remained a mystery to the Imperium, though it was speculated that the warband intended to sacrifice the living and defile the memorials to the dead for equally grim purposes.

Having wreaked havoc across the hive world and utterly poisoning the surface of the mortuary world, imperial forces finally arrived to find a world beyond saving and a hive world on the verge of sharing said fate. Though the imperial forces prevailed, it was very much a pyrrhic victory having lost the hive world to gain victory.