Board Thread:Warhammer 40k General Discussion/@comment-24.177.35.35-20141102013602/@comment-5880884-20141103132443

Even when his psychic abilities are nulled by the culexus, Magnus is still a son of the Emperor, with near supernatural abilities. I am quite sure he could put a bullet through the culexus' head even before it can fire its anti-psychic energies.

And of course Magnus is a super powerful psyker, more powerful than even Malcador. He can predict the coming of the assasin, and is powerful enough to simply overload the culexus with so much warp energy that he is killed.