Starlight and Storm — Rachel Greenlaw

Mira is trapped in a deadly situation which could see the end of everything she has fought for. She must enter into one final desperate bargain, but this time, it's with her greatest enemy, the ruling council. To save her life, her home, and the people she loves most, Mira is forced to compete in a series of terrifying trials filled with dark magic and dangerous monsters.
 
Her allies are scattered, her people without a home. With Eli lost in another world, Mira must shape herself into a weapon in order to survive. But with the true nature of the ruling council and their ambitions finally revealed, the battle for the future of the Fortunate Isles has become a war. And in war, there is only ever one victor . . .