Blood Scion

This is what they deserve. They wanted me to be a monster. I will be the worst monster they ever created. 

Fifteen-year-old Sloane can incinerate an enemy at will—she is a Scion, a descendant of the ancient Orisha gods. Under the Lucis’ brutal rule, her identity means her death if her powers are discovered. But when she is forcibly conscripted into the Lucis army on her fifteenth birthday, Sloane sees a new opportunity: to overcome the bloody challenges of Lucis training, and destroy them from within. Sloane rises through the ranks and gains strength but, in doing so, risks something greater: losing herself entirely, and becoming the very monster that she ahbors.