The sound comes from The Elder Scrolls IV: Oblivion, Bethesda's 2006 open-world role-playing game, where Imperial guards patrol Cyrodiil. Oblivion guards became a lasting meme because of their serious voice acting and abrupt lines, so their combat grunts and death yells were ripped and shared on soundboards and in machinima. This second death variant survived because it is brief, recognisable to anyone who played the game, and flexible enough to mark any video game death, fail or knockout without needing context from the original scene.