7 Deadly Instincts (The Sinfire Chronicles Book 1)

Caught between heaven and hell, virtue and sin, life and death—only the strong survive. In a world of magic based on the seven deadly sins, Grayon Fade—a slave without magic—is given the chance to become more powerful than he could have ever dreamed of. He'll have to do two things: Survive the Testing and avoid falling in love because in the world of Midmere, love is deadly. — Description from novelcodex.org