Avatar: The Last Airbender and Avatar: The Legend of Korra exist within a story that spans seven seasons of television. It's a magical world filled with humans who can wield elements as tools to enhance or defend their lives. There's only one being who can wield all four elements of water, earth, fire, and wind: The Avatar. The world relies on the Avatar to mediate between the human and spirit worlds but also keep peace between the four nations.