What I was thinking of specifically is that by, say, performing a healing act (or anything that "grows") the one using the magic gets an equivalent urge to destroy something. A small act of growth causes a small urge to destroy. A big act of healing causes a big urge to hurt.

So it's less a fact of debatable/questionable morality of good v. evil I'm looking for, than an actual *twisting* of one's personality due to one's magic use, as in magic use *directly* affecting mental state and/or spiritual state, to the opposite effect of one's using magic.

I would love book recs of stuff that explores this! ::bounces:: It's tricksy stuff but I'm not sure that I happened upon it in any appreciable form.