Riftborne by Bree Grenwich

He was striking in a cold-blooded kind of way, like his beauty was tinged with poison. Unassuming, alluring even.

I brought my eyes up to meet his.
“Fia Riftborne?” The words dripped from his lips like blood from a dagger.
Twenty years after a rebellion branded her an outcast, Fia Riftborne navigates a city rife with prejudice so deep, it’s often deadly. But she harbors a secret, one that would paint an even larger target on her back. A hidden power within her is growing, threatening to destroy everything she’s built for herself.
Enter the elusive Sidhe General, Laryk Ashford, who is building a unit of powerful wielders within the Guard to face a growing threat. Wraiths of darkness devour the Western border, leaving a trail of death and destruction in their wake.
When Fia’s power erupts, and two daughters of Nobility are seemingly dead, General Ashford offers her a chilling choice: join the Sidhe Guard or face execution.
Because Fia might be the only hope for the Isle’s survival.

Torn between surrendering to the chaos or becoming a weapon for those who took everything from her, Fia must confront her growing feelings for the General and face a dark truth that could shatter everything she’s ever known.