Storm Siren - Mary Weber - Bog

A slave in the war-weary kingdom of Faelen, Nym isn't merely devoid of rights, but her Elemental kind are only born male and always killed at birth. Meaning, she shouldn't exist. At her fifteenth sell Nym's storm-summoning killing curse is revealed. She is purchased by a court advisor and given a choice: become a weapon to win the war or be killed.