But what we do know is, Tom did get a huge supercharging out of if and repaired his mana body on Astlan and had enough power to reverse a Holy Artifact of Tiernon (which will also be a subject of much consternation). Again, because this is IMPOSSIBLE to do. Yes, Tiernon or one of his Avatars could in theory do it, but no Demon should even be able to touch the thing.
Did it permanently change him somewhat? Like he registers more on an non demon spectrum?
This seems like a question that would be answered in the next book to some extent. At least I completely see the preists of Tiernon and those demons who saw what happened scrambling everywhere to figure out what happened.