Spoiler on Lich location
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There is a lich in graveyard district while doing edwins npc quest.
There is a lich in the crooked crane in gate district.
There is a lich in the underdark where all the guys are imrisoned.
Theres a lich in docks district. AKA Kangaxx
There is a lich in the drow city. He is called deirox or something.
There is about an army of liches in the temple ruins.
I think there is more.
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The Black Killer