Vagrant, kensai, ranger 7-cleric, sorcerer, conjurer, blade: levels 15-19. I have 3 potions of freedom and 3 potions of clarity.
PLEASE, DO NOT READ THE SPOILER IF YOU HAVE NOT ENCOUNTERED THIS FIGHT.
SPOILER!
My big problem in this battle is an anti-magic field. All my buffs are dispelled - even through SI:A and even if I am nearer the Kuo-toa bridge with only one poor soul triggering the spawn. The improved web and whispers are a problem without buffs. I typically have the misfortune of 2 or more poor saps getting stuck in the web before the team moves out.