[Morgeruat]

This area is extremely difficult if you don't cheese and use the shield of balduran, my first time through I decided the cost outweighed the benefits, for something i would likely only use once or twice.

I had Yoshi hide in shadows with celestial fury, and girdle of hill giant str, walk behind and attack, then i discovered black isle had done their homework and you couldn't backstab beholders, so many reloads later, the area was completed.
Basically just hit them hard and fast, and heal constantly