I play in a weekly Dark Heresy campaign and we're developing some personnel problems. One of our group plays a psyker and has been dumping all of his experience into building up his psychic abilities. Now, he's an extremely unbalancing force. Last game, he killed a partially-bound daemonhost with a single half action, unaided, and used his other half action to completely heal three of his fellow Acolytes, all while regularly passing Fear-3 tests. He's a force of Nature and our (usually capable) GM doesn't know how to handle him, other than to give us an opponent specially-designed to kill the psyker (i.e. no-hope TPK scenario). The rest of us have more well-rounded characters and simply can't keep up with psi-boy. Does anybody have advice I could forward to my GM before my cell encounters a doomsday opponent?