Brand of Dusk (The Echoes of Vaelor #1) by A.M. Bennett

Every scar tells a story. Selene Rowan’s screams a warning.For twenty years, Selene lived a lie, convinced her weak magic was a defect. But when a brutal force tears through Ravenholt, draining the city’s magical population, the seal beneath her scar fractures. It releases a terrifying power that paints a target on her back.Ravenholt stands as a powder keg; the match is lit. To survive, Selene must outwit the Highspire elite–a society of marble halls and bloody secrets. Her only guide is Riven Ashborne, a lethal enforcer representing everything she hates.Untrustworthy and skilled, Riven claims he wants to stop the carnage, but his motives are as dark as his reputation. Bound by a volatile alliance, they hunt a killer harvesting magic for a ritual that could unmake the world.In a city built on deception, truth strikes as the most lethal weapon of all. Selene discovers her entire life has been preparation for a war she never asked to fight.