After leaving the North Pole, Aang masters Waterbending under Katara's tutelage. Searching for a new Earthbending teacher, the group meets Toph, a blind Earthbending prodigy who teaches Aang how to "see" using Earthbending and vibrations. Meanwhile, Zuko and Iroh, now fugitives from the Fire Nation, attempt to lead new lives in the Earth Kingdom. Zuko, with the help of his uncle, tries to come to terms with his troubled past and his obsession with capturing the Avatar. Aang and his friends discover that an upcoming solar eclipse will deprive Firebenders of their bending, leaving them open to invasion and giving Aang his chance to defeat the Fire Lord, but in learning this Aang's Sky Bison is lost to a group of Sandbenders. Azula and her two friends Mai and Ty Lee pursue Team Avatar, who struggle to reach Ba Sing Se, the Earth Kingdom capital, and tell the Earth King of the eclipse. After capturing and impersonating the Kyoshi Warriors, friends of Team Avatar, 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. In a final confrontation, Zuko sides with his sister, who promises to restore his honor. Aang is lightning struck by Azula and is severely wounded. Iroh helps Aang and Katara to escape after Zuko betrays him, and is imprisoned by the Dai Li for his actions. Katara revives Aang with special spirit water from the North Pole, but his seventh chakra is blocked and therefore he cannot enter the Avatar State.