I simply killed him with lvl 4 or 5 spiritual hammer, was lvl 38 and then 39 after this fight (on tactical difficutly level). I did this in single mode BTW, as I didn't want to endanger my DK.
Amulet: Go to the dream imp one level deeper (you're in the end level)and ask him about the amulet.- Have you been there yet? He will tell you, he has hidden it very well and you need fairy dust.
Do you remember the dungeon with all teleporters? There was a sapphire key, this opened the key in the NE room in the main level, containing fairy dust.
http://beyond.divinedivinity.net/help/act4_test3.htmNr 4 is the location of the key, I'm talking about.
Then find the key for the fairy dust cupboard. Place the dust into the water pool in the SW room.
http://beyond.divinedivinity.net/help/act4_academy_l3.htmNr 7 is the cupboard containing the dust. And the SW room has the pool, where to pour it into.
If you can't go to the dungeon with all those teleporters (you can only be there once) => don't mind this bust quest. This quest is still buggy, you get no Deathclaw Sword as a reward. <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />
Kiya
Sorry, can't show you Desdemona's maps, because I'm unable to go into her links at work - no clue why. I have Explorer version 5... But I hope, Hellfighter's maps help you.