A-13, The Rooms Ideas Wiki

A-13 is a entity who spawns after A-12 (don't ask why I chose 1 room back before A-13) A-13 has a 1/75 chance of spawning. It will turn a room dark and will make footstep sounds if spawned. You might need to pay attention to them, or else you will lose 1-10 health. A-13's old design is based on the thumbnail of "who wants the gnaw on human bones".

Room 13 (1964) - IMDb

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