-[X] All. He would reveal everything that had happened to him, and his new state of existence.
--[X] Write in: Start at the beginning, be factual, be truthful. When it comes to the battle with the Tyrant, he's pretty sure that was a psychic duel of some kind and that he beat it with memories of human experience, need, and the doctrine of the God-Machine. How its mind is gone, and the flesh now under his control like some servitor or similar device. He's probably some kind of psyker, and he's not ignorant to the fact they probably knew that, but an opportunity to do the right thing, to protect Covyria, his friends, and to advance the Quest for Knowledge has effectively landed in his lap and he needs help to make use of it. Present this as an opportunity, if a terrifying and disturbing one.