As "The Legend of Korra" Book 2 prepares to premiere September 13, Korra Nation is releasing a string of concept art to for Book 2 to give fans a behind-the-scenes glimpse at the creation of "The Legend of Korra." With concept art showing characters, setting like the Southern Water Tribe, and the Spirit World, it is a rich world. Check out "The Legend of Korra" Book 2 concept art gallery below!