Aang and Zuko both learn about the strong and close childhood friendship of Avatar Roku and Fire-lord Sozin. Sozin argued with Roku that, as the pinnacle of civilization, the Fire Nation should control the destiny of the entire world to ensure universal prosperity. As Roku was the Avatar, he knew the importance of balance between all people and disagreed.
When Sozin greedily took an Earth Kingdom colony, Roku had threatened to kill him if he tried to do anything that crossed the line. When Roku's island volcano erupted, Sozin came to help but, at the last moment, realized that he could rule the world if he let Roku die. Roku then died due to the volcanic gases, regretting his decision of mercy and leniency towards his once-best-friend. In his prison cell, Iroh tells Zuko that as the great-grandson of both Roku and Sozin, he alone has the ability to resolve their endless conflict and restore balance and peace to the world.
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