Stone grue is a type of monster in ADOM. Like all grues, they are construct demons with corrupting attacks. They are very tough and are able to pass through walls and doors; the latter means that unless the PC can somehow kill them off quickly (s)he has no means of stopping swarms of stone grues completely surrounding him/her, which can happen often in the Earth Temple. Outside of the temple stone grues are generally very rare, so are less likely to threaten the PC in swarms.