"The Lost Scrolls include sacred tales and rare documents hidden from the world. Each book tells stories about one of the four nations, sharing its legends, culture, and the art of bending its element. Air: This scroll contains all the knowledge gathered so far about the Air Nomads. Aang revisits his former monastery, while Katara learns the truth about Aang's mysterious past. Sokka reveals how he saved the Northern Air Temple from the Fire Nation."