Ghosar Quintus

Ghosar Quintus is a world described by Inquisitor J. Chaegryn as a "naked orb" with underneath a vast complexe of mines "noisy and productive". Since 111.M41 the dynasty Trysst were in charge of the mining operations for sixteen generations until the Chaplain Ortan Cassius unrevealed that they had fallen under the influence of a Genestealer Cult influence. During this dynasty's reign, Ghosarians were presented as an exemple to follow for citizens of the Imperium all through the Ultima Sector and beyond. Only three incidents were reported during those centuries and no uprising, there production of adamantium were a model of efficiency and purity unseen anywhere else.

The  Cleansing  of  680.M41
The first confirmed Imperial engagement with a Genestealer Cult occurred upon the mining colony of Ghosar Quintus in 680.M41. Investigating what appeared to be a perversion of the Imperial Creed, Inquisitor Chaegryn led a team of Tempestus Scions to Ghosar Quintus and ventured into the depths of the Great Pit. The deeper Chaegryn ventured, the more evidence of deviance he found. Strangely, his last communiqué stated that all was well, and that the Trysst Dynasty that ruled Ghosar Quintus should be left to its own devices.

It was a full standard year before Chaegryn's fellows in the Holy Ordos of the Inquisition noticed that something was deeply wrong. A five-man Kill-team of Deathwatch Space Marines was sent on a follow-up mission of lethal investigation, yet they too were swallowed by the mysteries of the Great Pit. Only when the steel-willed ChaplainOrtan Cassius mustered his own hand-picked Kill-team was the vile truth unearthed -- Ghosar Quintus was home to a xenos infestation.

Kill-team Cassius fought through hundreds of Genestealer Cultists as they plumbed the depths of the Trysst Dynasty's corrupted world. Though they made it out alive, the Space Marines were changed forever by the gruesome ordeal. Most shocking of all was not the Genestealer Patriarch that lurked at the heart of the cult, but the damning evidence in the mining cult's shipping holographs. Under the guise of industry, the xenos-tainted Trysst Dynasty had spread its curse across not only the Ghosar System, but throughout the sector. The implications were staggering.