After being pushed to his limit, Aang's Avatar State is forcibly re-activated. He overwhelms Fire Lord Ozai but ultimately chooses a non-violent path, using Energybending —a technique taught to him by an ancient Lion Turtle—to permanently strip Ozai of his firebending rather than killing him.
The finale is widely celebrated for its emotional depth and animation quality, though it remains a subject of discussion among fans for specific narrative choices: Watch Avatar The Last Airbender 2003 S03E21
Led by Uncle Iroh, the secret society liberates the occupied Earth Kingdom capital, Ba Sing Se , fulfilling Iroh’s true destiny. After being pushed to his limit, Aang's Avatar