(Spoilers below)
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OK, I've got the dagger from the demonknight in Durlag's Tower (whopped 'im all by meself, without resorting to the mirror

), went back to Ulgoth's Beard, had the said dagger stolen from me and a heck of a fight with the cultists.
Now I'm tryign to finish Hurgan's quest & retrive the dagger, but the $#&@%#&@ demon is tough!
Any general tips on what works, and what doesn't in this final fight?
BTW, those cultists by the side - they stay immobile. What's up with
*them*?