The Temple of Tarkoth - Argetallam Saga, #4

Janir Caersynn Argetallam is the girl who destroyed armies in an instant, but winning the war was half the battle. Returning to a homeland she can't remember, Janir is the most despised hero the country has ever known. Even after saving Brevia, hatred and fear of her magic-stealing powers condemns her to isolation. When a noblewoman's kidnapping sends Janir on a rescue mission into the heart of the distant Tathansian forests, it becomes clear a trap has been set not only for Janir, but for the man who raised her.
Love and loyalty are tested. Oaths are broken and dark secrets revealed. And to save the people she loves, Janir may be forced to betray them all.