>>96346180
The comet arrives, and the Fire Lord uses its firebending boost to razing the Earth Kingdom to the ground from an a fleet of airships. While Aang confronts the Fire Lord 1-on-1, the team splits up to stop the ships and fight Azula. Azula has FULLY lost it by this point, and is in an incoherent rage what she's defeated. Iroh, having broken himself out of prison and also being powered up by the comet, unites all the elder masters from the series and frees Ba Sing Se from Fire Nation control.

Aang is not doing well. He can't enter the Avatar State and the Ozai is way too powerful. By chance, Aang gets thrown into an outjutting rock and jabs him right in his lightning injury, which unlocks his blocked chakra and allows him access to the Avatar State again. Ozai is immediately put onto the backfoot as Aang chases him down, finally restraining his limbs into rock with earthbending. Aang's about to deliver the killing blow when he exits out of the Avatar State, still unwilling to kill someone. Ozai takes this opportunity to release himself and strike, only for Aang to use the secret that the ancient spirit taught him: spiritbending. With some struggle, Aang is able to strip away Ozai's ability to bend, for good. With the Fire Lord(s) defeated, Zuko becomes the new Fire Lord, and immediately orders the Fire Nation armies to stand down. The Hundred Year War is over.