[SixOfSpades]

My method for that fight (apart from the usual summoning some stuff and casting buffing spells, of course) was simply to take the right-hand guys out first. They're mostly stong-offense, weak-defense guys: An Archer, a Kensai, and a Druid, whereas the guys on the left cast things like Stoneskin and Protection from Magical Weapons. So if you can take out their right flank FAST and HARD, you've pretty much won.
Just watch out for the Hive Mother and that damn Succubus (or whatever she was.....)