Xav is a quiet 14-year-old boy who harbors Reivax, a chaotic and violent demon/curse, within him. Their personalities are opposites: Xav seeks peace; Reivax, chaos. Sometimes Reivax takes control without warning, putting Xav in danger. Reivax possesses abilities such as firing black arrows, creating clones by tearing off parts of his body, regenerating, controlling blood and fire, and flying with demonic wings. When he dominates, Xav's eyes turn dark with blood-red irises, his skin darkens, and his body becomes more toned and defined. Xav learns these abilities by imitation and only relinquishes control in emergencies, creating a constant internal conflict.