Last night a 65th cleric, 65th enchanter, and myself tried this thing.
I'm a 54th ranger with 1101ac, 3694hp and over 1200 atk.
If the dark eleves don't like you, make sure to kill the guard that walks around ther cleric guild, he will heal him.
I'd just like to add that he has a metic butt load of hp. By then end of the fight the cleric was manastoning. Took us about 30 minutes to drop him after we pulled, monk pulling brought only him up, and a couple other people said that is how they've done it.
Best of luck on him