While Team Avatar travels to Ba Sing Se so they can tell the Earth King about the eclipse, Zuko's younger sister Azula and her two friends Mai and Ty Lee try to capture them. Finally, the three of them capture the Kyoshi Warriors (friends of Team Avatar) and pretend to be them, so that they can invade Ba Sing Se. Azula persuades an elite group of Earthbenders called the Dai Li to instigate a coup d'état, allowing the Fire Nation to capture Ba Sing Se. At the end of the season, when Team Avatar is fighting against Azula and her allies, Zuko sides with Azula, who promises to restore his honor. When Aang enters the Avatar State, Azula shoots him with lightning. It hurts him very badly, and he almost dies. Katara brings Aang back to life with spirit water that she got from the North Pole in the previous season. But Aang's seventh chakra is blocked, and he cannot enter the Avatar State.