Hex Hall novels

After a prom-night spell goes badly wrong, witch Sophie Mercer is exiled to an isolated reform school for wayward Prodigium, supernaturally gifted teenagers, where she learns that an unknown predator has been attacking students.

Just as Sophie Mercer has come to accept her magical powers as a demon, the Prodigium Council strips them away and leaves her alone, defenseless, and at the mercy of her enemies the Brannicks, a family of warrior women who hunt down the Prodigium.