I went in to Doom with a Demon slayer book for a bit of fun. I noticed that the devourer of souls there aren't vulnerable to demon slayer as claimed in their UO Guide entry
That seems to be it. I never would have thought to try a different spell since I thought all direct-damage spells applied slayer vulnerabilitiesIm not sure if that was not bcs of "mind blast" its affect by int and magery skill of caster-dunno if slayer apply with this spell