Story starts with Aang Energybending Ozai, and what happens afterwards. Aang learns that he has to leave if he is to get this Demon out of him. Things don't always go as planned for the Avatar, as he learns of a Rebellion forming. KatAang and others too.

Avatar Aang has defeated Fire Lord Ozai and brought an end to the Hundred Years' War. The future looks bright...or so it seems. Ten years after The War, a new foe arises to threaten the peace. Will the Gaang be able to stop this darkness? Rated T-violence

Two weeks after Sozin's Comet, the Avatar must seek a way to restore his lost people. Following the legacy of his old teacher, he journeys across the 4 Nations looking for clues. But evil never rests - a new alliance between Ozai, a Dark Avatar and the ancient Airbender Avatar Ko-Rei threatens to destroy both worlds. And for Aang, the greatest struggle may be within..