The line comes from Warhammer 40,000: Dawn of War, the real-time strategy game based on Games Workshop's grim science-fiction universe, where Imperial Guard units call out threats during battle. In the game, Guardsmen deliver short, practical voice lines when they encounter hostile forces, and this Chaos warning is one of those battlefield alerts. Clips from Dawn of War voice lines have long circulated among Warhammer fans and strategy players, who reuse them for edits, streams and memes because the delivery is instantly recognisable as an enemy spotted call. Its short length makes it easy to drop into new contexts.