Amanu Ensis

Amanu Ensis is a powerful Chaos Sorcerer of Tzeentch. Once, he was the Chief Librarian of the Emperor's Basilisks chapter, but the chapter was purged when an unstable psychic mutation broke out among the chapter's initiates. After the purge, Amanu was the only known survivor of the chapter, as he had pledged his soul to the Changer of Ways, Tzeentch. After this, he created a one way portal to the Warp, which served as his ticket to survival.

History
Since then, Amanu has offered his services to powerful Champion of Chaos in exchange for whatever knowledge he wishes to know, and leaves once it has been acquired. On some occasions, once he learns what he wants, Amanu turns on the warband he once served and destroys them, before fleeing. However, he has not done this for ages because of a dark secret that still haunts him to this day.

The Crystal Labyrinth
Many centuries ago, Amanu Ensis was able to journey to the Crystal Labyrinth, the Realm of Tzeentch. While at first, Amanu thought this to be the perfect place to discover knowledge, he quickly regretted his decision, for once he had entered the Labyrinth Amanu was driven insane in a matter of, what seemed to him, days. Constantly on the move, Ensis met challenge after challenge, danger after danger, and quickly fell into the palm of madness.

(More to follow)

Personality
Amanu was once a brilliant Librarian and psyker, knowledgeable in many fronts when it came to the Warp. However, after his chapter was purged, and he bargained his soul away to Tzeentch, Amanu became less knowledgeable and became shrewd and self-righteous, only caring about himself and the knowledge he so craved. Again his personality would take a dramatic change when he journeyed into the Crystal Labyrinth. After this, what sanity remained of Amanu Ensis quickly evaporated into nothingness, and Amanu was, quite plainly, insane.

Making tactical judgements that even the most dazed of orks would laugh at, the once proud and acute Amanu was but a shadow of his former self.