Umbra Malygris was one of the worse traitors in the history of Adeptus Mechanicus. His twisted imagination knew no bound and centuries after his alleged death his blasphemous creations still plague the Calixis Sector.
History
As a loyal Archmagos in the Adeptus Mechanicus exploration fleets during the 39th millennium, Umbra Malygris travelled far beyond the Emperor’s light. His travels brought back an immeasurable fortune of technology from humanity’s forgotten colonies, but eventually the lure of forbidden knowledge became too much for Malygris and he turned his back on the Imperium. Many of his junior tech-priests followed him into darkness, and the following mass defection caused civil war within the Cult Mechanicus of the Calixis Sector. Many heretic fractions tried to enlist Malygris in their own dark machinations, but the renegade Magos answered all such propositions with extreme violence. A sect of traitor inquisitors, known as the Phaenonites, was nearly destroyed for having bothered Malygris with their offers of an alliance.
Inventions
For centuries Umbra Malygris plagued the imperiums fringes with his foul creations. He is among other things believed to have rediscovered the Sarcosan wave generator, which had been forgotten since the Age of strife. This infernal contraption allows the user to raise and control hordes of undead and it can even be used to create a perverse resemblance of intelligent life in the necrotic tissue. Another of Malygris inventions, the Apostasic Matrix, can forever destroy a person’s capability to true faith, love and all other absolute convictions.
Legacy
In the end Umbra Malygris disappeared and he is by most presumed dead. According to legend, the templates to all his creations and artefacts are hidden on some remote planet, in the so-called Altar of Genocide. To this day the major heretek fractions of the Calix sector fight among themselves over the right to this arcane treasure.
Sources
Dark Heresy: The Radical’s Handbook (RPG) p. 120-122, 190
Dark Heresy: Disciples of the Dark Gods (RPG) p. 62