In 12 BG, Sozin used his dragon to cross the hundred miles that separated the Fire Nation Capital and Roku's island in order to help his old friend battle the erupting volcanoes that threatened to engulf the island in fire. When Roku was fainting from the poisonous volcanic gases, Sozin's dragon swooped in and saved only his master, while the pyroclastic flow swept over the Avatar and his dragon, killing them both.