There is a skill book on the floor at the top of the stairs between the short entrance hallway and the main room. If you don't already have the Healing spell or spare skill points to put into it or Regenerate, or maybe Summon Ghost or Summon Demon, Hide in Shadows, etc, that may help a bit (there were also a few skill points available in the arena from mindreads).
D2:ED topics with suggestions for the fight itself:
