The Tenth Power: The Chanters of Tremaris Trilogy, Book III (Unabridged‪)‬

Calwyn used to be exceptional. She was the most talented of all the chanters of Tremaris, and she’d fought hard to become their leader. But then there was an accident, and the magic inside her went silent. Where there once was power, now there is nothing. Her whole life–the future she had planned with Darrow–has somehow slipped away.
All Calwyn wants to do is limp home and hide. But she can’t, because although her power is gone and taken all happiness with it, her responsibilities seem to grow every day. There’s a sickness attacking the chanters of Tremaris, a sickness that seems to have infected the land itself. And even though Calwyn is now just an ordinary girl with no magic left in her, she can’t sit by and watch the world die.
This is a story about tremendous courage and the strength of spirit that life sometimes demands. But it’s also a story of hope, because sometimes when everything you know has failed you, there is another way. Sometimes there is a tenth power–if only you can find it.