Elements

The four elements must work as one. Fire, air, water, and earth together in the avatar.
When the avatar suddenly dies it is up to a group of teenagers to find out what is going on. The strange magic that killed her is other worldly and this world will be thrown into chaos of they can't figure it out. Follow these benders as they save the world, learning who they are in the process.
A Tempest and ATLA AU (you do not have to read or watch them to read them). Tempest is by Megswriting and the characters in this story are based off of the characters in that story.