Ygethmor the Deceiver - Fall of Medusa V: Ygethmor was later gifted a vision by the Warp, a glimpse of a future that might be. He saw himself exalted upon a mountain of corpses as the undiluted power of the Empyrean writhed about him. He saw a planet scoured by the power of Chaos, transmuted into a Daemon World and himself as its master. To achieve his aims, Ygethmor gathered about him a mighty force, a conglomeration of Chaos Space Marine warbands, each of which was an army in its own right, and each led by a Chaos Lord hungry to share in the glory. Fulgrim's Champion, Lucius the Eternal, stood ready to fight beside Ygethmor's warriors, and two Great Companies of Iron Warriors readied their wargear to support the Deceiver. The Dark Apostles of the Word Bearers roused the masses against the False Emperor and the Alpha Legion's spies stirred rebellion in the great hive cities throughout the sector. Renegades from within the Maelstrom flocked to the cause as well. Even Ignatius Grulgor, beloved of Nurgle, and a warhost of Death Guard under his command stood ready to go to war at the Black Legion's side. Abaddon granted the Chaos Sorcerer four Black  Legion companies, to be chosen by the Deceiver himself. Thousands of Chaos Space Marines from the Traitor Legions rallied to his cause, their numbers swollen by Renegade Space Marines from around the Imperium. Every warrior in Ygethmor's army fought to honour the Dark Gods and for the bounteous blessings of Chaos should they succeed.Following the 13th Black Crusade's end, Ygethmor was responsible for the destruction of the population of the worlds of Corrialis and Galafonte. Ordo Hereticus agents in the Galafonte System failed to learn the lesson of what Ygethmor was capable of following the Corrialis Massacres. In almost identical circumstances to what had happened on Corrialis, the population of Galafonte turned upon itself, worshipping the Dark Gods of Chaos in a frenzied slaughter of all life in the heavily populated star system. The Inquisition later speculated that the extermination of both Corrialis and Galafonte were little more than "experiments" in damnation, paving the way for Ygethmor's attempt to transform himself into a Daemon Prince on Medusa V. Ygethmor commanded the powerful Repulsive-class Grand Cruiser Blade of Damnation, which boasted firepower and accuracy far above other vessels of its class. The Blade of Damnation was known to be possessed by a daemonic spirit, which was consistent with the many infernal war engines used by Ygethmor's Black Legion warband of Chaos Space Marines.During the campaign later named the Fall of Medusa V by the Imperium, Ygethmor knew what must be done if he was to realise the future the Ruinous Powers had promised him -- the planet had to die. Atop a pillar of cadavers heaped upon the ruins of the Imperial Cathedral in the planet's capital city of Hive Euryales, a sorcerous ritual of inconceivable power had to be enacted. At the very moment that an approaching Warp Storm engulfed the planet, Ygethmor would be required to call upon the unlimited power of the Warp. Yet, for this ritual to succeed, it required millions of lives to be sacrificed to the Dark Gods and the glorious victory of the Forces of Chaos over the world's Imperial defenders. For Ygethmor, the prize was the power of the Warp unleashed and dominion over what might become his Daemon World of Medusa V. Despite his promises to Abaddon, Ygethmor fought for more than the glory of the Warmaster and Chaos; every victory brought him one step closer to daemonhood.Ultimately, Ygethmor's plans to ascend to daemonhood were foiled; while many aspiring Chaos Champions were able to achieve battlefield glory during the campaign on Medusa V, they were unable to claim the planet for the Ruinous Powers due to the heroic resistance of the Imperial forces.Ygethmor was slain by the blade of the Asuryani Autarch Elarique Swiftblade of Craftworld Alaitoc, and those Champions of the Dark Gods who had followed him were left to their fates on the dying world as the Warp consumed them.