The Iron King's Assassin Series by Thea Atkinson

Fight like you're already dead.I'm Ava, and I hunt monsters. That ink on my forearm is there to remind me if I don't give it my all when I face a beast, someone will die. Hopefully, it's the monster, but if something goes wrong, and it ends up being me, at least it won't matter to anyone. My parents are dead. My sister won't talk to me. Even my mentor turned lover replaced me with a younger, perkier version... moreFight like you're already dead.I'm Ava, and I hunt monsters. That ink on my forearm is there to remind me if I don't give it my all when I face a beast, someone will die. Hopefully, it's the monster, but if something goes wrong, and it ends up being me, at least it won't matter to anyone. My parents are dead. My sister won't talk to me. Even my mentor turned lover replaced me with a younger, perkier version.So when I'm ambushed by the dark fae after I've taken out a black magic witch, I’m in no mood for their demands. At least, not until the second in command of the Shadow Court delivers his ultimatum: Kill the Iron King or my sister dies.He's hot AF. Ruthless. Powerful. The kind of bad guy that might make my spine tingle in all the right ways if he wasn't dragging me kicking and snarling into a land of magic where I don't even understand the rules. But compelling as he might be, there's only one sort of creature who threatens the life of an innocent woman. A monster.And I kill monsters… less