Gonarch is the giant headcrab boss encountered in Half-Life, the 1998 first-person shooter from Valve, during the alien world of Xen. Much larger and more aggressive than ordinary headcrabs, it attacks by charging and spawning smaller headcrabs, making its encounter one of the game's most memorable boss fights. Its distinctive roar has since been ripped from the game's audio files and shared on soundboards, where Half-Life fans and meme creators reuse it to signal a looming threat or an oversized enemy in edits and streams.