Avatar Aang-Firelord Irohs quest for peace

A war was beginning to wage, causing devastation around the world. Avatar Aang was in process of training on coast of the fire nation when the water tribe arrived during a rare full moon and cornered him, he fought all he could but was pulled into the water and brought near an underwater active volcano. His air bison attempted to bare the deep water to help him but in turn was caught with him unable to escape, as he got closer to the lava which was pouring out he activated his avatar state but being near death from lack of oxygen was only able to encase himself and his air bison as they seeped into the lava. 100 years later, Zuko and Azula were digging for diamonds and rate minerals in the deposits of an island that formed 100 years ago. As they kept digging they stumbled upon the Avatar encased in earth and in a stasis. They bring him back to the capital of the fire nation and Firelord Iroh explains the story he was told to Zuko and Azula about what happened all those years ago when Aang was training on their shores. Now avatar Aang must restore balance to a shattered world which has been ever so altered by the northern and southern water tribes, using the oceans each full moon to cut the earth with water ensuring ammo for their arsenal to invade beyond the shores.