The melody comes from the final boss theme in Dark Souls, released in 2011, where players face Gwyn, Lord of Cinder, in a quiet, ash-covered arena. Unlike most boss music, the theme is built around a slow piano line, and fans began imitating its opening notes online as plin plin plon. That nickname stuck, turning a sombre boss theme into a widely shared shorthand for melancholy, defeat and anticlimax in gaming edits, streams and short videos.