ToME: the Tales of Maj'Eyal

How do you get the quest The Fall of Zigur? I have completed with another character but with my current character when I go the the Mark of the Spellblaze the grand corrupter is hostile.

He always starts hostile.

When you beat him up real good, he may turn friendly, if you are a spellcaster.

Ahh, that makes sense. I have been playing mostly spellcasters recently and didn't remember exactly when I got the quest. It is a shame because my skeleton berserker really wanted to take down those magic haters!