We Who Will Die - Stacia Stark

Arvelle, struggling to protect her younger brothers in a brutal district, makes a desperate, magically binding vow to assassinate an ancient vampire emperor. To get close, she must survive the deadly Sundering arena and infiltrate the emperor’s elite guard—only to be entangled with a former lover and the emperor’s dangerous son. As hidden powers awaken, Arvelle uncovers a conspiracy that could reshape her fate and doom them all.