Khorion IX was a planet deep within the Halo Zone. Little was known about the planet, beyond having a mysterious network of pre-Imperial barrows, as it had barely been charted before the planet was taken by Chaos.
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Khorion IX became a place where cultists of the Daemon Prince Ghargatuloth gathered and were sacrificed. With the lives and the suffering offered up by the willing cultists, the world became saturated with the power of Chaos and become a massive staging ground for the daemonic hoard under Ghargatuloth's command. The Daemon Prince took control of the planet as he prepared to manifest itself in realspace as part of his plan to destroy the Imperium in the name of his master Tzeentch.
Unwilling to commit an immediate Exterminatus, the Inquisition pre-opted for a ground assault, as they needed to confirmation of the banishment of Ghargatuloth. The Ordo Malleus gathered a full three Brotherhoods, a force of three hundred Grey Knights, led by three Grand Masters, including Grand Master Mandulis who had been the sole member of the assault force who survived just long enough to banish the daemon. After the Grey Knights recovered the scant surviving resources on the surface, (notably, only the body of Mandulis was recovered) the world was later subjected to Exterminatus.