[quote=MonsieurShade]
If the issue is about power, might I suggest giving the guy's most powerful ability a prep time while turning it into a bit of a double edged sword? Like say, he could, with enough time to prepare [i.e. a time that would make it highly impractical in single combat] level a small town, but at the same time that move could put him extremely close to death?
[/quote]

I quite like this idea. I will approve of this power. Each time you use this massively powerful magic, it's going to require a large amount of prep time, and it's going to leave you drained.