Unfortunately for you, that 10,000 year old corpse IS denying the powers of chaos. As are the Iron Hands who are undeniably awesome. Oh, and malfunction? Pah, never.
Anyway, this is all a moot point since i've just remembered the Grey Knights. So yeah, i'll be a psyker, one who causes physical pain to daemons just by my mere presence. Suck on that, chaos boy!