[andrewas]

This battle is one of the toughest in the game.

I got past it by lame cheesy tactics - running through the portal between kills and resting up.

Concentrate on the easy meat first - the humanoids to the right. The marilith (six armed naked lady) requires breaching before it becomes vulnerable - so ignore it till last. The elder orb is a major pain but also rquires breaching. Try and get it to target a character with a shield of balduran or a cloak of mirroring - unfortunatly elder orbs have the unique ability to get rays past these items, so your still not safe.

The huntress will hurt you with arrows but the two close combatants do more damage and are easier kills, although one of them requires breaching as well.