Cholercaust Blood Crusade - Initial Assault: The Keeler Comet was no longer an ordinary astronomical body, a simple amalgam of ice, rock and metal plummeting through the void, enslaved to an orbit and the long chain of gravity. It had punched through the Eye of Terror and into the Warp and had been changed by this transgression, its nature abnormal, its purpose twisted. Like a claw tearing at the very fabric of reality, the blood comet had opened rents in time and space, tainting the darkness of realspace and creating an immaterial breach through which the raw essence of the Empyrean could bleed through wherever it went.Looking towards the unnatural flux of the sky, the comet's tail was such a rift, and the unfiltered insanity of the Warp was pouring out into the void before falling towards Certus-Minor with gravitational certainty to streak down through the Cemetery World's atmosphere. It is hypothesised that weak Daemonic entities and Warpforms might burn up on descent, and that the grip other such creatures had on reality might be weakened by such a scorching. What horrified Corpus-Captain Zachariah Kersh was his Librarian's belief that anything resilient enough to survive planetfall and impact would be equally difficult to kill.Much to the 5th Company's dismay, Corpus-Captain Kersh ordered them to make a defiant last stand against the invaders, and stranded his forces on the doomed world by sending their Apothecary and their crippled strike cruiser, the Angelica Mortis, to a nearby Forge World out of the comet and the Blood Crusade's path. The strike cruiser took the 5th Company's precious gene-seed with it to be used to create future generations of Excoriators after the Astartes remaining behind had been slain.Kersh commanded less than half of a full company of Space Marines as well as an Astra Militarum regiment of Certusian Charnel Guard against a legion of Chaos Traitors, Daemonic Bloodletters and Khornate Berserkers. Despite the odds, Kersh formulated a plan worthy of the Chapter's ancestors who had defended the Imperial Palace during the Siege of Terra, leading a bold last stand by the Imperial defenders at Certus-Minor's capital necropolis of Obsequa City.The weight of the initial Khornate assault far exceeded even Kersh's estimates, and things began to look grim for the Imperial forces. The first wave was composed of hordes of chitinous, foul Warp spawn and Daemons. The valiant Imperial defenders managed to hold back the first assault after fighting continuously for over 20 solar hours of hard combat. But Kersh understood that what they had seen was merely the beginning of what the Blood Crusade could throw at them. The comet's malign influence had turned the Certusian people against themselves and further bolstered the enemy's number. The horrors they had witnessed thus far were merely immaterial overspill, the detritus of the Warp, bleeding through into material existence.The main body of the Cholercaust had yet even to arrive. When it did, it would make what they had seen so far seem like nothing. An invasion made up of countless Chaos Cultists, the Blood God's Daemons and, worst of all, the Heretic Astartes of the World Eaters Legion. The Khornate Traitor Marines were insatiable in their thirst for slaughter and unparalleled in their desire for wanton carnage. They spearheaded a Blood Crusade that had never known defeat and that had consumed hundreds of Imperial worlds -- and they would kill everything living on the surface of Certus-Minor.