House Name: the House War: Book Three Reprint edition

Once, Jewel was an orphan, struggling to survive in the slums of the realm until she was rescued by Rath and sent to live at House Terafin- the most powerful of the ruling Houses in the Essalieyan Empire. But as Jewel finds her place within the House, she becomes crucial to the Empire's survival in the demonic war that's about to begin...