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However, only the Avatar has the ability to bend all four elements.
When the Avatar dies, its spirit is reincarnated into the next of the four nations in the Avatar cycle: the Fire Nation, Air Nomads, Water Tribe and Earth Kingdom.
Afraid of his new responsibilities and of separation from his mentor, Gyatso, he fled his home on his flying bison named Appa.Avatar: The Last Airbender is set in a world which is home to humans and hybrid animals, adjacent to a parallel spirit world.Human civilization is divided into four nations: the Water Tribes, the Earth Kingdom, the Fire Nation, and the Air Nomads.When Ozai hears about his older brother Iroh's resistance to Zhao, he sends his daughter Azula to capture Iroh and Zuko.
After leaving the Northern Water Tribe, Katara continues teaching Aang Waterbending while the group searches for an Earthbending teacher.
Forced into the ocean by a storm, Aang entered the avatar state and encased them in suspended animation in an iceberg for one hundred years.