It's not even funny any more, I've got 4 arcane magic users (fighter/mage PC, Jan, Edwin, Nalia) , 1 cleric (Anomen) and 1 druid (Jaheira) in my party, and it seems nothing can take him down... just when I think I'm getting near, he tosses out another Greater Command and half my party lies down for a nap.
My party scripts check resistances before casting spells, so I know he's resistant to pretty much everything, and he's only taking 9 damage per hit from a Cleric Staff +3 wielded by someone with 19 Str... when he can actually be hit...
Any hints or tips would be appreciated.