In the Season 2 finale, Avatar: The Last Airbender centers on Aang's spiritual training under Guru Pathik and his friends' defense of Ba Sing Se. The episodes feature Toph creating metalbending, Zuko's crucial decision to align with Azula, and the eventual fall of the Earth Kingdom after Aang is mortally wounded. A detailed breakdown of both episodes can be found on Avatar Wiki . The Crossroads of Destiny | Avatar Wiki | Fandom