Mafia keeps getting me beaten up by casting Deep Dark Visions in order to burn off mp. Without spooky resist, that just wastes mp and hp. I think mafia should skip trying to balance Visions of the Deep Dark Deeps.
r13574 blacklists Deep Dark Vision from mana burning when not using Moods.
Personally, I use moods to avoid this sort of stuff, and you can also configure things to not use particular skills, but this one will get you killed a lot.