Dave, does Aerie have any 6th level spells yet? Bolt of Glory and False Dawn are both quite good.
You only need one more part of the lich, namely the torso. The head *is* or will become Kangaxx himself. The Torso can be found in the bridge district, in one of the houses alongside the water on the bottom half of your map. Be careful with the trapped door!
BTW No, you haven't missed anything, the liches don't drop anything and the bodyparts are all you can obtain from them.
Good luck!
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Melusine, Archbabe of the OHF and the LH
Your voice is ambrosia