There's only one lich in IWD, and that's Terikan. It might be confusing, since it doesn't specify him as Terikan, only as Lich. But this is him! Kill him once, run to the coffins behind him, snatch the key, go to the Hall of Heroes and get the crystal, and take it to Jamoth's tomb. This will destroy him. If necessary, when you fight him again in the Hall of Heroes, have your party distract him and his minions while you have your Thief search each of the tombs for the crystal, since many traps are around.
-Wrath
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