The Moonlight Blade by Tessa Barbosa

I promised my mother I would never come to Bato-Ko...and yet here I am.
Narra Jal is one of the cursed, cast aside her whole life, considered unlucky. But with her mother's life on the line, she will return to the city where she was born to face the trials: a grueling, bloodthirsty series of challenges designed to weed out the weak, the greedy, and the foolish. Trials to select the next ruler of Tigang.
Narra has nothing. No weapons. No training. No magic. No real chance of leaving with her life. Just her fierce grit and a refusal to accept the destiny she's been handed. Even the intense, dark-eyed Guardian she feels a strangely electric connection with cannot help her. Narra is on her own. But she'll show everyone what the unlucky can do.
Let the bloodbath begin.