The Dawn Star (Misted Cliffs, Book 3)

The Dawn Star (Misted Cliffs, Book 3) by Asaro, Catherine. paperback edition. ISBN: 9780373802388.

With no teacher to guide her, no mentor to discourage her from the impossible, Mel Dawnfield pushed her magic to its limits — and surpassed them. Only to find that her powers arent enough to halt burgeoning rebellion within her husbands fledgling realm — or a plot devised to strike at the very heart of Mels family. The lines have been drawn. Mels mage strength has become greater than any power ever known, but dare she forge her spells into weapons to protect her people, her husband? For her magic might transform the brutality of war into the birth pangs of a peaceful empire…unless it proves the death blow to her world.