Halo Reach is a 2010 first-person shooter developed by Bungie for Xbox 360, and its multiplayer is known for announcer Jeff Steitzer calling out multikill medals as streaks climb. Killpocalypse sits near the top of that ladder, just below Killionaire for ten kills. Clips of the call spread through YouTube montages and forums during the Reach era, then stayed in use as a standalone reaction sound on soundboards, where gamers reuse it far outside Halo to mark any nine-in-a-row achievement or exaggerated hot streak.