Anyone got suggestions for insanity rules? Thinking of running a horror themed campaign that might benefit from them. I suppose the players could do wisdom checks or will checks, take a point when they fail, and have various maladies associated with different levels of points or something. Points would be cumulative on a short-term basis, but wear off over time. Maybe the check's more difficult at night, when the moon's full, in a dungeon or confined space, or when friends are hurt or dead.
Any ideas or systems already out there?
Any ideas or systems already out there?