User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-190.92.7.204-20150612220839/@comment-3045936-20150614173925

CROWLEY I mean he became the deadliest demon to walk the face of the earth. Killed thousands. The best at being the worst. And then he just... Disappeared. Everyone thought he was dead or, at least, hoped he was.

From the transcript.