A Lair of Bones (Curse of the Cyren Queen Book 1) by Helen Scheuerer

A deadly contest. A vaulting ambition. How far will one cyren go to win? Mighty cyrens have ruled the ancient lair of Saddoriel for centuries. A cavernous fortress, a subterranean labyrinth of tunnels and levels, powered by magic and music… From the moment she was born, Roh, the daughter of an infamous criminal, has been despised by her own kind. Restricted to the Lower Sector and forced to work as a common bone cleaner, she has always believed she belongs above: where lies adventure… and power. Opportunity arises in the form of the Queen’s Tournament, a treacherous set of trials that could see the victor crowned ruler of the entire lair. Up against the most cunning, dangerous cyrens in all the realms, does Roh stand a chance? A Lair of Bones is the first gripping book in the dark fantasy quartet, Curse of the Cyren Queen.