The Southern War

5 years have passed since Fire Lord Ozai's fall, and the Gaang is making their way in the new world. Except Aang and Katara. She went with Aang, travelling around, through the hottest deserts, up the coldest glaciers, down the darkest caves. Not having been home for 4 years, she slowly loses her happiness, having no more roots, a sense of obligation filling the void. When she finally snaps, she finds her home in ruins, and her brother missing. With the South rapidly being taken over by a mysterious gang, can Katara find her brother fast enough and prevent another war from breaking out?