Ah, it seems like you're referencing the opening line from the animated TV series "Avatar: The Last Airbender." In the show, the line goes, "Water. Earth. Fire. Air. Long ago, the four nations lived together in harmony. Then, everything changed when the Fire Nation attacked." This line serves as an introduction to the story's premise, where the Fire Nation embarks on a war of conquest, disrupting the balance between the nations and setting the stage for the series' events.
