Child of Chaos (Warhammer 40,000)

"Whisper the name Erebus, for it is a curse and a beseechment to the dark gods. It is perhaps true that evil does not start out as such. Some tragedy, some error of judgement... Not so with Erebus. His evil has ever been ingrained. On Colchis, his story begins, the arch-heretic who turned his face from the Emperor to embrace the pantheon of Chaos."
Child of Chaos is a short story by Chris Wraight in the Horus Heresy Series. It was first published in 2018 as part of the 2018/19 Events Anthology