Heart of the Cursed by Georgina Stancer

He’s a fae. An assassin. And she’s his next mission.

Arun had walked the earth for over a thousand years, mostly hidden from view. That is, until a great war broke out among the paranormal. Everything the Humans thought of as a myth, or a story told to entertain, came crawling out of the shadows.
That day the world changed. No longer were the Humans at the top of the food chain. Instead, they hunkered and hid, trying to survive another day.
When the war ended, the Humans thought they were safe, but the paranormal didn’t return to the shadows from once they came. With blood on their minds, they hunted the Human kind, with nothing standing in their way.