Killtrocity comes from Halo: Reach, released in 2010 as the final Halo game developed by Bungie. It belongs to the game's multiplayer medal system, where the announcer voiced by Jeff Steitzer names multi-kill medals in escalating order. Killtrocity sits high in that chain, above Killtacular and below Killimanjaro, rewarding six kills within seconds of each other. The medals became iconic across the series, and short clips of the announcements spread widely in montages, streams, and meme edits long after Reach's original release.