Sozin's Comet: The Final Battle
After a fierce battle, Ozai slams Aang into a rock inadvertently releasing his locked seventh chakra and enters the Avatar State. With the power of his past lives, Aang overwhelms Ozai. Although Ozai is subdued, Aang refuses to kill him; instead, he locks Ozai down with earth. He realizes what the lion-turtle had meant and uses Energybending to strip Ozai of his Firebending powers, ending his ability to wage war. Afterwards, Aang raises and lowers nearby water to undo the damages that the Fire Nation caused.