I apologize for not including the spoiler warning. I followed the link and, sure enough, found a way to kill Firkraag.
It was not easy, but I came up with a method: Have Anomen sic a pit fiend on Ol' Scaly, have Nalia cast lower magic resistance, have Aerie turn the critter into a flying squirrel, and--ta daaaaaa!--Firkraag was toast.
It took quite a few reloads and frustration, but I finally managed to do it!
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