Lioleia, known in Japanese as リオレイア (Rathian in the broader Monster Hunter localization), is a large wyvern from the Monster Hunter series rather than a human character. She is a prominent monster encountered by hunters as an early-to-mid game challenge and often serves as a key example of the series’ combat design. Lioleia is recognized for her poisonous tail attacks, aerial mobility, and territorial behavior. She plays the role of a powerful predator and recurring hunt target across multiple Monster Hunter titles.