casting frenzy and bloodlust on your main fighters helps alot to kill him. I also had about 5 differt storm spells htting him at the same time. Having wicked weapons and taking out his other tree friends makes it easier. Once all are gone it doesn't kill you as much and healing spells should keep you alive.
For killing him you get heaps of XP. LIKE 1,000,000 or something!. All characters get like a 5 level boost!. The only problem with this is you cant get the upgrades for guilds for all five levels gained
------------------
ShadowMaster of the Theives of Darkness. I'm also an ice cream man!