One of the things I like about the CofD games like Mage is it has a mechanical tracker for doing vile stuff. "Sure, you can curse him to vomit forever but that's going to call for a Wisdom check." Losing wisdom means you're worse at containing spell miscasts. Uncontained spell paradoxes will ruin your day. And hitting wisdom 0 means the character is unplayable.

I've stopped a lot of nonsense with "that'll be a wisdom check, if you're sure you want to do that"