Avatar the Last Airbender 1: the Rift - Bryan Konietzko (hardcover)
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As Avatar Aang and his friends confront an ancient spirit determined to destroy a town on land sacred to the Air Nomads, Toph and Aang find themselves on opposing sides in a battle of gigantic proportions. If Toph and Aang don't put aside their differences, there's more at stake than just their friendship!