The Daylight War: Peter V. Brett

Book III of The Demon Cycle: On the night of a new moon all shadows deepen and the demons rise. Arlen understands the threat better than anyone. Resisting the coreling plague has shaped him into a weapon so powerful he has attracted enemies from both above and below ground. As he prepares his people for battle, a daylight war approaches from the desert - an army led by Ahmann Jardir, who believes it's his destiny to unite humanity against the demons, willingly or not. Once a brother to Arlen, he is now a bitter enemy and Jardir's ambitions are matched by the magic wielded by his first wife Inevera, a powerful priestess. And the corelings will attack in thirty days - and the only men capable of defeating them are divided against each other. Cover art by Larry Rostant.