I had a very high level party when I tried this encounter (it was after I emerged from the underdark) The key here is to *NOT* fight him, do the peaceful encounter, go upstairs, whack his mage, then go back downstairs, set up, prep, then *FORCE* attack him. This will allow your Thief to get in a vital backstab as well as keep your mages out of range. I had a level 12 (I think) archer with Grand Mastery in longbow, she pretty much just stood out of range and hit him with cold arrows. I did 2 or 3 called shots on him, and I had Minsc and Anomen whack on him. ARCHERS ARE KEY! 4 attack per round pretty much make it so nothing can cast a spell, as long as protection from missle shields aren't up! Minsc used his Lilacor sword (I love that thing! Great damage and funny as heck!) and pretty much wiped up with him. Doesn't hurt to cast chromatic orb and magic missle as well, maybe a few breach spells to make sure that the archer can get through
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