Hmmmm well that's a bit hard as it's still all coming together but I think I like the elemental corruption aspect, where you have to use it in small amounts to get used to it but it will still change you, just in small ways instead of larger dramatic ways. So when younger you use it in small amounts and eventually that allows you to build up a tolerance, lets say to your powers. Thus allowing you to do greater feats and for longer. Like a young child might only be able to summon a small flame, but someone older might be able to form it into a whip or a suit of armor. Another example would be that a blacksmith would refine his fire (lets say he has fire) so that he can burn it hot and increase the heat at irregular intervals like bellows. Or a less experienced one might ask for the aid of someone born with air to blow air into it to act like bellows for him.
Uh...hmmm probably something I wrote a long time ago I think.
Also another hard one, hmmmmmmm I can't remember but I do know I've eggregiously misspelled some things before...like just now xD