Avatar

In each generation, only one Bender is capable of controlling all four elements. That Bender is the Avatar. The Avatar is the spirit of the world manifested in human form. When the Avatar dies, it reincarnates into the next nation in the cycle (air, water, earth and fire). Starting with the mastery of his or her native element, the Avatar learns to bend all four elements in the order of the cycle. Throughout the ages, the countless incarnations of the Avatar have served to keep the four nations in harmony.