Gutterwitch

In this captivating crossover fantasy, a scullery maid must hide her forbidden magic when she enters an elite witching academy in a world on the precipice of war. When Joan Scullery stumbles upon a fallen star, she seizes the chance to change her fate. Although sworn to serve her witch-mistress Belinda, Joan asks the star to grant her dearest wish: to become the greatest witch who ever lived. Instantly, she's made into a fearsome and forbidden thing-a witch with wild magic. For years, Joan hides her star-given power, as the magic of the wildfolk is outlawed among witches.
But when she and Belinda are invited to study at the elite witching university Givenine, she is swept into a world of ancient academia, ruthless politics, and powerful sorcery. While Joan is shunned for her lack of lineage, her magic flourishes, and she finds solace in her mentor Silas and fellow outcast Caspar, the bastard son of a faerie queen. As Joan's powers grow, however, she's thrust into a web of danger and secrets that threatens the fragile peace between witches and wildfolk.
With her heart and loyalties divided, Joan is at the front lines of a new war that will shape her destiny and the fate of witchkind forever.