Hundred Year War

Over one hundred years prior to the first episode of Avatar: The Last Airbender, Firelord Sozin dreamed of expanding the Fire Nation so that he could share its prosperity with the rest of the world. Upon sharing his plan with his best friend Avatar Roku, the two drifted apart since an Avatar could never accept waging a war in a time of peace. Nonetheless, Sozin did not let anything get in the way of his dream, for he later chose to let his old friend die, meaning that there was no longer an Avatar who could stop him.

Years later, Sozin decided to finally enact his plan by using a comet to enhance his military’s firebending power so that they could eliminate the next Avatar born into the cycle, therefore, targeting the Air Nomads. This Air Nomad Genocide marked the official beginning of the Hundred Year War, where the Fire Nation waged war upon all three of the other nations, resulting in one hundred years of brutal raids and thousands of casualties.

Now present-day in the show, the Fire Nation is nearing victory in the war, with the Avatar still nowhere to be found. Due to this, people began to lose hope and started to question if the Avatar Cycle was truly broken after all. Unbeknownst to them, deep in the South Pole, there is a biologically 12-year-old boy trapped in an iceberg, who is the only one who can save the world.