I might be mistaken about what you're asking but unlike Baldurs Gate YOU have to create all your characters at the start - there are no recruitable NPC's in Icewind Dale.
And maybe I'm not that good but to get to Dorn's Deep with one Character only is very impressive!
I'm sure you need to find the Phylacterie( Or something ) to capture the Lich's spirit and I thought it was in the first room on the left as you enter.
If i'm wrong don't worry..I'm sure someone will give you a more indepth answer than mine.
Oh, and welcome to the forum!
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