Water. Earth. Fire. Air. Long ago, the four nations lived together in harmony. Then everything changed when the Fire Nation attacked. Only the Avatar, master of all four elements, could stop them. But when the world needed him most, he vanished. A hundred years passed and (Y/N) and Sokka discovered the new avatar, An airbender named Aang. (I don't own anything of avatar the last airbender, this is a fanfic of it.)