Abaddon. The community clowned on him so hard as armless 12 time loser Failbbadon. But really he's one of the biggest threats to the Imperium, whose black crusades have all caused innumerable deaths and devastation and now he has broken Cadia and split the Imperium in half with the Great Rift.
Every single Primach to start with. But in all honesty I'm going to throw my hat into the ring for Trazyn the Infinite. A soulless, deathless husk of a once great scholar trying to maintain his sense of self but taking his old duties to a galactic scale and catalogue all of creation with zero ethics
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