The Omegaverse (A/B/O) is a popular speculative erotic fiction subgenre—originating in fanfiction—built on a human hierarchy of dominant Alphas, neutral Betas, and submissive/childbearing Omegas. It features biological, wolf-inspired elements like pheromones, "heats" (ovulation), "ruts" (rut-induced aggression), scenting, and mating marks (neck biting) to define intense, often fated romantic relationships.