Iron kin - M.J. Scott

The Half Light city is divided. Fae and human mages on one side, vampire Blood Lords and shape-shifting Beast Kind on the other. Between these supernatural forces stands a peace treaty that threatens to shatter at the slightest provocation. Saskia is a metal mage and her parents raised her to do the right thing. To her family that means staying safe behind the walls of human society, to continue her work as a respectable metal mage, never putting herself at risk. But as tension rises in the city Saskia must do what she can to protect the treaty.