Kingdom of Fire and Ash by Liliana Hart

From bestselling author Liliana Hart comes an out-of-print book that has been revised and updated, with never before read scenes.

Since the Banishment, Rena has become the Drakan Enforcer, cleaning up the messes her dragon brethren make in order to keep their presence in the human world hidden. When a group of rogue Drakan begins killing dragons who refuse to join the army of the Destroyer—the dragon they believe will become their true king—Rena has no choice but to take action.
Every clue Rena uncovers indicates Julian, leader of one of the five clans, is the Destroyer. But when she confronts Julian, the blue mating fire—a phenomenon that hasn’t been seen since the Banishment—engulfs them both. Rena must make a choice—kill the one destined to be her mate—therefore sacrificing herself—or protect her people before they’re all turned to ash.