Storm Siren and Siren's Fury by Mary Weber

Storm Siren is book 1 and Siren's Fury is book 2 of the Storm Siren trilogy. Siren's Fury is in hardback.

Storm Siren synopsis:

In a world at war, a slave girls lethal curse could become one kingdoms weapon of salvation. If the curseand the girlcan be controlled.

As a slave in the war-weary kingdom of Faelen, seventeen-year-old Nym isnt merely devoid of rights, her Elemental kind are only born male and always killed at birth meaning, she shouldnt even exist.

Standing on the auction block beneath smoke-drenched mountains, Nym faces her fifteenth sell. But when her hood is removed and her storm-summoning killing curse revealed, Nym is snatched up by a court advisor and given a choice: be trained as the weapon Faelen needs to win the war, or be killed.

Choosing the former, Nym is unleashed into a world of politics, bizarre parties, and rumors of an evil more sinister than shes being prepared to fight . . . not to mention the handsome trainer whose dark secrets lie behind a mysterious ability to calm every lightning strike she summons.

But what if she doesnt want to be the weapon theyve all been waiting for?