An unexpected visitor

Elem is a 15 year old boy, that lives in a small town in the Earth Kingdom. He always had a passion for bending, he is amazing at it and almost no one can beat him, not even the adults.
He lives in a world that's in an era of piece, but some rumors say that an old organisation is causing trouble in the Fire Nation, and the Avatar hasn't been seen after Avatar Korra died, but Elem's life changes forever, after he is told that he is the new Avatar.