Ygethmor
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Ygethmor the Deceiver is the Sorcerer Lord of the Black Legion and Chosen of Abaddon. He has been a bane to the Imperium for hundreds of years and was last seen during the Medusa V campaign. He also took part in the Eye of Terror campaign, Abaddon's 13th Black Crusade. He is a high priority threat to the Imperium due to his mastery of warp powers. He is known to have caused two systems, Corrialis and Galafonte, and almost the totality of the population, to rebel against the Imperium and declare allegiance to Chaos. It has since been decided that these two systems were both experiments for Ygethmor in preparation for Medusa V.
During the 13th Black Crusade, at least seven Assassinorum agents were dispatched to destroy Ygethmor but none succeeded. In surveillance images, Ygethmor appears to have four eyes arranged in a rather daemonic-like way. He appears also to have a permanent ship named the Blade of Damnation, known since before the Karkass incident. The Blade of Damnation is a Repulsive Class Grand Cruiser but boasts colossal fire power and much greater accuracy than a ship of its size should have. One Admiral Helsten claims that The Blade of Damnation is possessed by some form of Daemonic entity, although this is almost impossible to prove. Given Abaddon's past history with machine/daemonic integration, the possibility should not be discounted. The ship also took part in the Battle of Horen's Belt, where a pict-capture was successfully acquired.
Inquisitor Baptiste made a quote with regard to Ygethmor:
"This is not the first world that Ygethmor has destroyed, and unless we can halt him now it will not be the last. Should we fail, millions will die and we shall not be found blameless."
Ygethmor is believed to have been slain on Medusa V before its destruction by the Eldar Autarch Elarique Swiftblade of Alaitoc. Elarique cut through hundreds of lackeys to finally kill Ygethmor by removing his head, armed only with her ancestral power sword. She was killed almost instantly by Ygethmor's men, although her actions have no doubt saved countless lives.
In a final show of the nature of chaos, the commanders of the Black Companies sent by Abaddon had very specific orders concerning the fate of Ygethmor: he was to be given any assistance needed, but if he failed, they were not to bring the sorcerer back with them.
