No, you just need to hit them REALLY fast
Sorry, but that's all there is to it
Of course better weapons make it easier to kill them, but you can only bypass their high regeneration rate by hitting them fast enough.
Try having your tanks beating him with their best weapons and have a mage fire Magic Missiles at it.
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Melusine, High Queen of Fluffies, Archbabe of the Order of the Holy Flame and the Laughing Hyenas, &
Official Entertainer Elf of the BG2 Bar
Your voice is ambrosia