Sozin was a Fire Nation ruler in the animated series Avatar: The Last Airbender. He is best known for initiating the Hundred Year War against the Air Nomads and other nations, aiming to expand the Fire Nation's power and influence. Sozin's ambition was fueled by his desire to create a world dominated by firebenders. Sozin developed the Sozin's Comet phenomenon, which significantly enhanced the power of firebenders during its arrival. His actions set the stage for the events of the series, as the war led to the near extinction of the Air Nomads and the rise of the Avatar cycle's challenges.