About what Maze put inside Flint. I think it'll have this kind of effect. Flint will now be able to sense Maze as good as Maze can sense Flint, though Flint will be practically helpless when Maze gets close. People like Brianna might sense some of Maze's evil hanging around Flint.
As for the other changes, Flint will be able to use low (really low) forms of Maze's shadow magic, something like the fear-sending thing. Further, his destruction skill will rise to the point where it is actually useful in battle. I was thinking of including a Fireburst spell: Lots of little fireballs shooting out of his hands at high speed. rapid-fire.
Over time though (fast-forward), Maze's influence on Flint will weaken, though Flint's skill with shadow spells won't. He'll see it as just another school of Magicka.
We're talking here about a Breton after all. Resistance to Magicka. No matter how powerful Maze's Magicka is, over time Flint will slowly get rid of it. And since Maze will be locked up for a while and messed up himself, Maze won't be able to renew it.
Good enough, or does anyone think this is too uber?