The Tavern

Because it has been always awful tedium

I'm grinding abyss for !mutation to cure bad mutations.
Curing mutations definitely induces !mut grinding because no one would bear awful mutations if they want to win game.
So enemy Malmutate spell is just cancer in this game that should be removed asap

Sounds to me like Abyss grinding is the real problem here.

(I'd be happy if enemies couldn't cast certain spells like Malmutate, Banishment etc. on the first turn they see the player. Certain places are real autoexplore traps as they are now.)