Demon in Silver (War of the Archons Series, 1) [Ford, R. S.]

In a world where magic has disappeared, rival nations vie for power in a continent devastated by war.

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When a young farm girl, Livia, demonstrates magical powers for the first time in a century there are many across the land that will kill to obtain her power. The Duke of Gothelm's tallymen, the blood-soaked Qeltine Brotherhood, and cynical mercenary Josten Cade: all are searching for Livia and the power she wields.

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But Livia finds that guardians can come from the most unlikely places... and that the old gods are returning to a world they abandoned.