The line comes from StarCraft, Blizzard's real-time strategy game, where the Wraith is a Terran air fighter that can cloak and strike from above. Like other unit acknowledgements in the game, it plays when a player selects or orders the ship, giving each faction a distinct radio voice. As StarCraft became a lasting competitive and streaming staple, its short unit quotes were clipped, shared and reused far beyond matches, and this one survives because it works as a neat, instantly understood arrival signal.