The boy In the Ice Berg

Long ago the four nations lived in harmony. Everything changed when the Water Tribes attacked. Only the Avatar master of all 4 elements can stop this war. But when the world needed him most he vanished. 100 years have gone by and my brother and I discovered the new avatar, an Airbender named Aang. While his air bending skills are great, he's got a lot to learn before he's ready to save anyone. And I mean a lot. But with my help, Aang can save us all.
- Princess Azula of the Fire nation

Imagine the atla universe If the water tribes attacked. Things are gonna be slightly different to fit the story.
Reverse avatar
Roles reversed