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. Water: This scroll contains all the knowledge gathered so far about the water tribes. Katara recounts her discovery of the Avatar in the iceberg, Sokka remembers his childhood when he encounters an old friend of his father's, and Aang tells of his lessons with the Waterbending master in the North.