Phantom by Terry Goodkind

In this installment of the epic fantasy series, the central hero is missing and his closest allies grapple with the effects of a powerful spell that has erased him from their memories and altered the political balance of the world; as a ruthless enemy advances using mind-invading magic and armies, those who still feel the echo of what was must fight bureaucratic and magical obstacles to uncover the truth, rescue the captive, and confront wrenching moral choices about identity, loyalty, and sacrifice.

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