Hexxat quest problem (ToB)

i cant catch what i have to do after i defeat wooman in tomb with lich. there is no way or secret doors... mb i need to use those helmet? but i cant use ou wear it...
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Please help! I'm really frustrated right now. :L
I have another problem in that tomb. I have found the first necromantic field (where only Hexxat can get through). I have disconected it already, but all doors are closed. What the f*** should I do now?!
Edit: I'm disappointed. At the end Korkorrant ended up being a very easy enemy. The demilich in SoA was a much more challenging enemy. How sad
Hope this image will help someone
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....found it, fifteen minutes later