Exorcism has limited use especially at the later stages of the game where there is a lot of demon and undead. If you look at the damage modifier, it actually stacks quite a bit with all the items added but yes, it's a weak spell and should be an AOE/DOT instead of one direct hit.
I think by far, the worst spell is still Book of Evil. Never use it and never invest and crystal in even getting the spell.
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