Moon Beetles - Moon Beetles, #1

Rinnaya has never known the land of Illyson to give her anything but loss. Her Ironskin Lineage, once powerful and prosperous, is now reviled. And while dealing with the unbearable loss of her parents, her older brother left her to raise her younger brother, Liam, alone. All she wants is to give Liam a happier, safer childhood than she had. But when she discovers her essence contains the same latent power that led to the Ironskins' demise, she is forced to leave Liam behind to receive training.
If she doesn't, he'll be taken from her to protect him from her uncontrolled abilities. But leaving home for the first time stirs the darkness in her lingering trauma. When her older brother reveals a plot for an Ironskin rebellion, and that he's placed her at the centre of it, it becomes harder to separate her past from her present. As she decides between helping the rebellion or severing yet another family tie, Rin must face her loss if she wants to heal her heart, control her power, and stop a war.