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The public execution of 666 heretics on the planet of Horvar III has terrible consequences. Through the pageantry and extravagance of the event the nearsighted planetary governor unwittingly completes an ancient daemonic ritual. As the last heretic dies with a curse upon his lips, the circle of sorcery is complete and a gateway to the Warp is opened. The Chaos well yawns wide and Daemons spill out, gibbering, howling and spitting lurid fire into the mass of terrified citizens. In a matter of hours Horvar III is turned into a daemonic playground of madness and death. The unfortunate planetary governor is possessed by the Slaaneshi Daemon Prince Laesydra and the Golden Host is released upon the world.
The Grey Knights arrive in force to discover Laesydra hosting blood games with the surviving citizens, the Daemon forcing them to commit unspeakable acts of violence against each other or be hurled into the Warp-well. Turning its attention to this new foe, Laesydra crafts a series of tests for the Space Marines, shaping tangled labyrinths of living, screaming flesh around them and sending Seekers of Slaanesh to hunt them down. The hunters soon become the hunted, however, and the Grey Knights fight their way to the Warp-well where the Daemon Prince is holding court over the mutilated remains of Horvar’s citizens, wearing the skin of their governor. At the cost of the lives of a score of Grey Knights the Daemon is cast back into the Warp. Before the battle-brothers depart they pile the citizens’ tortured bodies onto of the corpses of the executed heretics, sealing the Warp-well with the blood of innocents.