Carbon

The Carbon elementalists were wiped out to end the war, only Emma and her brother survived. They hid as refugees, struggling to get by for years. When Emma accidentally reveals her deepest secret, it looks like their lives are over. But a stranger offers her a chance to fulfill her destiny in exchange for her brother's safety. She is brought to an elite academy to train alongside other elementalists as an assassin, and learns how to control the world around her. As her powers grow, she finds herself becoming something more dangerous. Can she conquer her fears to keep her brother safe, even if it means turning herself into a monster?