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Night Mare (original 1982; edition 1991)
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Wikipedia in English (1)
Amazon.com Product Description (ISBN 0345354931, Mass Market Paperback)Although the Nextwave of barbarian warriors was invading Xanth, Mare Imbrium discovered that ever since she had gained the half soul, the night mare had begun to mishandle her job of delivering bad dreams. Exiled to the day world with a message for King Trent, Mare met the relentless, unforgiving Horseman. For the night mare, it began to be all a horrible nightmare!
(retrieved from Amazon Thu, 14 Feb 2013 13:34:05 -0500)
Mare Imbri, a deliverer of bad dreams, is made partially real so that she can warn King Trent of Xanth about the coming invasion.
(summary from another edition)
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