Yet, in the 10,000 standard years of Imperial history, no Grey Knight has ever been corrupted by the Ruinous Powers of Chaos. Unlike other Astartes, every Grey Knight is a potent psyker. The existence of the Chapter is virtually unknown outside of the Inquisition and the highest echelons of the Imperial Adepta, and is a well-guarded secret enforced by mind-wipes and even assassination of Imperial citizens if necessary. It is kept as a private preserve of the Inquisition. The Grey Knights' fortress-monastery, the Citadel of Titan, is based on Titan, the largest of the moons of the gas giant Saturn in the Sol System. The Grey Knights act as the military arm or ' Chamber Militant' of the Ordo Malleus, the Daemonhunters who form the oldest branch of the virtually omnipotent Inquisition. They have the honour of being implanted with gene-seed engineered directly from the genome of the Emperor Himself. They were created by the Emperor Himself with the aid of Malcador the Sigillite at the time of the Horus Heresy to serve as Humanity's greatest weapon against the threat posed by the existence of Chaos. The Grey Knights are a secret and mysterious Chapter of Space Marines specifically tasked with combating the dangerous daemonic entities of the Warp and all those who wield the corrupt power of the Chaos Gods.

Corruption of champions golden seed