I would agree with adding a non-bladed weapon to the list of "things that can hurt Karoug", as I prefer to play Priests. However, I don't think adding a +1 minimum would be a good idea even though he's got +30/round regeneration. He's a bonus boss in a low-level game, I'd say a +2 minimum would be better than a +1... though that would put him on par with Aec. It would also allow the majority of solos to meaningfully damage him without resorting to cheese, between Varscona, Ashideena, and the +3 Zerksword.
(Personally, I think the Demonknight is the worst of the three major bonus bosses in BG1, as Aec is a one-trick pony and Karoug doesn't spam AoE mezzes)
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(Personally, I think the Demonknight is the worst of the three major bonus bosses in BG1, as Aec is a one-trick pony and Karoug doesn't spam AoE mezzes)