Awakened, She Rises as the Frost

Callista was six when she watched her aunt burn for teaching magic. In the city-state of Os no woman may practise sorcery, and the punishment is the fire. For fifteen years Callista hides her sex, goes about dressed as a man and scrapes by at the Academy of Magic. The Flame Clan kills her family. She goes over a cliff during it, and at the bottom the old frost line in her blood wakes. She comes back and kills the lord of the clan, then turns back a dragon army. She tells the city who she is in public, stands in front of the Council of Elders and demands the laws against women be struck out. Afterward she travels to the Wind city-state under a name that is not hers, meets Prince Silas and falls in love with him. The two of them set about joining the two states and putting magic within reach of anyone who can use it, whatever their sex.