Degradation by M.J. Haag

Salvation, like love, comes in many forms.
With the curse binding the brothers broken, Kellen is determined to free her sister. To do so, she must find a powerful caster in the great city of Adele.
But in a city ruled by an evil queen, where people vanish without a trace, Kellen soon realizes not everything is as it seems. The most powerful casters are hiding, and the people cower in fear of the crown.
To save the men she loves and free the imprisoned city, Kellen must break free from the rules she’s known and embrace who she is meant to be.