There is a prophecy written that after the avatar defeated fire Lord Ozai a new evil would be born, but with that evil there will be light.
The new Avatar was born and so was her chosen both born of the same light with a bond so strong that if threatened you would die due to the sheer raw power behind it.
One born was born in the southern water tribe while the other was a prince in the fire nation.
It is said they would rid the earth of the evil coming but they would face hardships along the way meeting new people.
