In the third and final season, Aang is unable to use the Avatar State. Although reluctant with the plan at first, Aang accepts to have everyone think he had died and his remaining allies attack the Fire Nation's capital, but are thwarted by Azula. However, Zuko has a change of heart, rebels against his father, and offers to teach Aang Firebending. Aang and Zuko also improve their Firebending powers with the help of their world's last two dragons. (In this part of the show, he is 13) During the finale, finding himself on a strange island, Aang is reluctant to actually kill Fire Lord Ozai, despite his four previous past lives (Roku, Kyoshi, Kuruk, and Yangchen) convincing him it is the only way. But upon learning that he was actually on the back of a Lion Turtle, one of four that made the first benders by manipulating humans' chi, Aang receives the Lion Turtles' Energybending. During the final battle, Aang's scar is pressed against a jutting rock, opening his chakras and allowing him to enter the Avatar State. Aang wins the battle, but before he delivers the final blow, he stops himself. Instead, Aang removes Ozai's bending ability, rendering him harmless and ending the Hundred Year War. Later, in the Fire Nation capital, Aang is seen beside Zuko, the new Fire Lord. The series ends with Aang and his friends relaxing at Iroh's tea shop at Ba Sing Se, where Aang and Katara share a kiss.