I played it about 15 years ago, during my last summer before going to college. I remember 2 things about it:
- When we got to the spherical chamber with Drelnza, I had a flash of inspiration. We opened the door just wide enough for me to put my hand through. I then cast
lightning bolt and quickly closed the door (remember that in 1e, the bolt would extend to its full length and rebound on stone). The DM ruled that she got hit a few times. After that, she was easy pickings for the ranger and cavalier