Avatar: The Last Airbender
The four elements water, fire, earth and air are used by benedrs for alot of different things. Benders can only use one of the four elements but the Avatar can master all four elements. One day the Avatar dissapeared and after 100 years of terror in which the fire nation had taken out most of the water benders and all of the air benders. Then a young girl Katara and her brother Sokka found the new Avatar-Aang the last air bender.
Note: only avalible in DUB