Sorceress of Shadows. Heirs of a Broken Land, #3

She lost her home, her magic, and her purpose. Now she must find the will to fight. In an attempt to save her mentor, Shirina paid a devastating price. Now, infected by the darkest of powers, she is bound to a talisman and cursed with limited magic. On a quest to safeguard what remains of the Circle and fulfill its mission to protect the Land of Light, Shirina must find a way to fuse the clashing powers of light and darkness.
With dwindling time until her body succumbs to the inevitable darkness, Shirina must re-forge old alliances. Cassara Edoline and Avarielle Grayloft are her only hope of success, but the princess distrusts her and the warrior wants her dead. As the final battle for their land erupts and the three struggle with their failing powers, they must once again join forces to reunite their broken land or watch their world crumble and be swept away in tides of death. The conclusion to the beloved epic fantasy trilogy. ".having such a wonderful read with such a great ending means I can wholeheartedly tell everyone that you should definitely, absolutely and without question read all three books in the Heirs of Broken Land series.
[.]  All in all, a perfect fantasy adventure!" -- Sequential Tart