M'kay, OP'ed is actually a new term on me. I'm guessing you mean either Omnipitent or Overpowered (the former of course naturally covers the latter. Lol) Well, the siren dude is pretty powerful, but his magic comes at a very inconvienient price which makes him loath to use even the weakest of his abilities, and he's really far from invincible (especially if you know just where to pick) he'd really be the only one you might be concerned about. Despite the vast and odd heritage of the other, his skillset mostly covers "everyday use" magic. Minor first aid, boiling a cup of water for tea, etc. His only heavy skill is in glamour, which is necessary for his research.
Ah, but I am saying too much. Better to fix up a couple of apps to better explain. ~wink~