We'll need to get a closer look when we see him in person, then.
By now if he's been keeping up with the Westerosi adventurers he should be at minimum a Cleric of the Sixth Circle, though he could easily be of the Seventh Circle. Pair that up with the Father investing a lot of power in him up to and including a potential Ring of Mind Blank, and regular fights with monsters in Westeros. Yeah, I can see it.
The angels are the real problem, though. As others have noted before, that antimagic field is a massive problem.
@Goldfish, has Lya got the Tattoo Guardians made for her yet?