Into the Labyrinth by Margaret Weis & Tracy Hickman
This is the 6th novel in the Death Gate Cycle and won't make much sense unless you have read the previous 5 books. Into the Labyrinth continues the action packed story of Haplo, Alfred, and Dog, who have been stranded in the deadly Labyrinth; and of Xar who is hell-bent on conquering the world via zombie apocalypse.
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