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Ghosar Quintus is a world of the Imperium.
Ruled by the Trysst Dynasty for several centuries, in 680.M41 a major Genestealer Cult infestation was discovered by Inquisitor Chaegryn upon the world. It was discovered that the Trysst Dynasty had come under the control of a Genestealer Patriarch, and the family was purged by a Deathwatch Kill-Team led by Ortan Cassius in the first major Imperial encounter with Genestealers.
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 communique stated that all was well, and that the Trysst Dynasty should be left to its own devices. It was a full year before Chaegryn’s fellows noticed that something was deeply wrong. A five-man Kill Team of Deathwatch Space Marines (Kill Team Excis) was sent on a follow-up mission of lethal investigation, yet they too were swallowed by the mysteries of the Great Pit and hadn't survived the initial ambush. Only when Chaplain 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.