Finally finished this dungeon over the weekend. I must say it's one of the better ones.

Got Yxunomei using my "Web 'em then Fireball 'em" (TM) or WETFE :D tactic. Here's a cool observation - although webbed, Yxunomei stil cast Cloudkill, which also affected the rest of the yuan-ti! :D

Those who could, shot missile weapons at her. Arrows+2 worked, as did the throwing axe (curiously, it did cause damage although it was listed as a +2 axe. I thought you needed +3 or better?)

The rest took care of the underlings.

On to the Severed Hand! :D