The Black Prism. Book 1. Lightbringer

The world attempts to heal in the aftermath of a savage war, which took place sixteen years ago. Now all is ordered and controlled by the world's only magic school, the Chromeria, which keeps a tight political reign on all nations through its acolytes' highly-sought abilities. By manipulating the colour spectrum, these gifted individuals gain access to great power, and the head of the Chromeria is the most powerful of his generation. Supposedly. Yet Gavin is living a lie, and those closest to him are near to discovering his secret, while another long-dormant issue is about to become critical. Gavin defeated his malevolent twin Jarven at the height of the last war but Jarven's prison won't hold him for much longer. Balance is vital in a world where magic controls all from the weather, to the harvest to war. Now that balance is about to change.