Renegade's Magic(2007)

Robin Hobb

Loyal, privileged, and brave—a soldier in the service of the King of Gernia—Nevare Burvelle survived a devastating plague of enemy sorcery, but at a terrible cost to his soul, body, and heart. Now he stands wrongly accused of unspeakable crimes, including murder, the most heinous of them all. Suddenly an outcast and a fugitive, he remains a hostage to the Speck magic that shackles him to a savage alter ego who would destroy everything Nevare holds dear. Perhaps, however, this curse that has long abused him can be used by him instead—a mighty weapon he can learn to wield for his own purposes. But down what perilous road will this desperate new quest lead him? And what will be the ultimate incarnation of Nevare Burvelle?