A demon can be built in the Treasure Room of a player-owned house for 500,000 coins when a player has 75 or higher Construction.
They mostly resemble greater demons, but do not count towards any Slayer task when killed.
They are normally the same size as humans, but gain their impressive size and bulk when Challenge mode is activated.
- The demon is the only guardian whose examine text is different from its non-player-owned house equivalent.
- The examine text may be a reference to the Killer Rabbit of Caerbannog, from the movie Monty Python and the Holy Grail. In the movie, an enchanter named Tim references the many qualities of the rabbit, including its "sharp, pointy teeth", ending with the exclamation "Argh, look at the bones!".