Deluge is a world of the Galaxy.
During the Horus Heresy, Deluge was assailed by the crazed Daemon Prince Angron and his World Eaters. As the fleet led by the Conqueror hung in orbit, Deluge's population was butchered. The slaughter was interrupted by Perturabo's small fleet, which arrived to bring orders that Horus has called for a muster on Ullanor in preparation for the drive on Terra. Kharn appeared before Perturabo and his escort and urged them to leave before it was too late, but soon enough the World Eaters and accompanying Khornate Daemons threw themselves at the Iron Warriors. Several thousand Iron Warriors endured the onslaught with a shield wall and using their own tanks as barriers. Perturabo constantly redeployed the formation, eventually boxing the World Eaters into small pockets. However the situation changed when Angron himself appeared from the stormy sky, viciously attacking Perturabo. The Daemon Primarch was subdued by Perturabo, Volk, the Iron Circle, and other nearby Iron Warriors, and as Angron lay on the ground regenerating an Ultramarines fleet arrived in orbit to kill all upon Deluge's surface. Angron was eventually convinced by Perturabo to come with him, and the Daemon Primarch created a Warp Storm that swallowed the Iron Warriors and World Eaters fleets and allowed them to travel to Ullanor.