Amon

Amon stands among the most storied sons of the Thousand Sons, a warrior whose life was interwoven with the fate of his primarch from the very beginning. When Magnus the Red first came to Prospero, it was Amon who served as his tutor and guide, and in later years he rose to command the Ninth Fellowship of the Legion and to hold the honoured office of the primarch's equerry. He was, moreover, a precognitive psyker of rare power, the first to master the art of divining the future, and thus the founder and first Magister Templi of the sorcerous school that would come to be called the Corvidae.

For much of his life Amon was entrusted with a particular and fateful charge, the guardianship of Ahzek Ahriman, whom Magnus favoured above almost all his sons. Amon watched over the younger sorcerer through the golden years of the Great Crusade and the catastrophe that followed, when the treachery that saw Prospero burned drove the Legion into the arms of Tzeentch and away into the Eye of Terror. Through the Horus Heresy and the ruin of all they had been, Amon endured, one of the few constants of a Legion unmoored from everything it had once believed itself to be.

The breaking came with the Rubric. When Ahriman conceived his great ritual to halt the flesh-change that was devouring their brothers, Amon was drawn into the cabal that enacted it, and shared in the guilt when the working reduced the bulk of the Legion to lifeless dust. For that crime Magnus banished the conspirators, Amon among them, and in exile the old seer set himself to undo what had been done. He gathered a warband of the lost and the renegade, the Brotherhood of Dust, and sought out the one mind he believed capable of reversing the Rubric's horror: Ahriman himself.

That reunion proved his end. In their final meeting Ahriman, grown vast in power and pitiless in purpose, unmade his former guardian, stripping from him his knowledge, his armour and his followers, and reforging the Brotherhood of Dust into the warband thereafter known as the Prodigal Sons. So passed Amon from the histories, the tutor consumed by his pupil, the keeper undone by the very thing he had kept. His fate is a fitting parable of the Thousand Sons themselves, a Legion forever devoured by the knowledge it could not resist and the ambitions it could never master.