This is crossposted to Archive of Our Own under the name dragonsigma.

Aang

All four elements before the end of the summer. A daunting task. And if he failed... he couldn't even imagine what would happen. No, he knew exactly what would happen. He had seen it, the desolation and death and burned relics of a world that had long since forgotten peace. He couldn't fail. And he wasn't going to fail.