
An illustration that possibly depicts the Demons, along with the Dismemberment Goblins.

Character models of the Werewolf, Merman, Scarecrow Folk and possibly Demons
Demons are Monsters kept inside the Facility. They were listed on the whiteboard, but were not bet on, nor were they seen at during the System Purge.
Physical Descriptions and Attributes[]
The appearances, characteristics, and number of Demons is unknown, as they are not seen at anytime during the film. However, illustrations of demonic-looking humanoids can be seen in the film's visual companion, bearing extreme similarities to the Dismemberment Goblins, and its very possible that the Demons are similar in appearance: humanoid beings with terrifying features; wings, long and pointy teeth, horns, etc. However, if the Demons' appearances are separate from the Dismemberment Goblins, their descriptions are unknown. Demons and devilish creatures are present in an array of religions and mythologies, so there are many different possibilities of how they could look and behave. It is equally possible that no specific demon props were created and that their inclusion in the whiteboard choices simply fulfills a common horror movie trope.
In the The Cabin's Cellar, it is unknown what object directly summons them. Any item traditionally associated with the occult is a possibility, such as occult books or items used in Satanic rituals. The particular item would likely depend on what specific tradition the demon in question originated from.
Appearances[]
The Demons do not make an appearance in the film. It's possible they were designed to be filler Monsters. However, in behind the scenes footage and the visual companion, artwork and character models were designed that depict demonic looking humanoid characters, so it's very possible the Demons were meant to have screen time but were cut in the film's final version. An otherwise unidentified monster prop could conceivably have been intended to be a demon. It is equally possible that they may have no visible form at all.
Inspiration[]
Demons are one of the oldest known antagonists in Ancient Mesopotamian religion, Christianity, Judaism, Islam, Hinduism, Celtic mythology, literature, European folklore, and modern media. Some demons are said to not have a physical body at all, but could affect humans and living things through energy or bad luck. In Christian theology, they are fallen angels, previously divine beings that sided with Satan in his rebellion against God and were cast down out of heaven and into hell as punishment.
In literature and movies, demons are usually represented in one of three forms. One is that of very ancient beings forgotten on Earth, such as the those in the Cthulhu Mythos. The second type are evil gods from ancient mythology, such as Baal or Pazuzu, and are usually assisted by hordes of lesser demons or goblins. The third type are the evil spirits of human beings who continue to exist by feasting on the souls of the living, such as Freddy Krueger from the Nightmare on Elm Street franchise.
Some examples in TV, film, and literature include:
- Demons by Lamberto Bava, in which they are fast and vicious with long nails and long splayed teeth for tearing flesh.
- Night of the Demon
- "Sometimes They Come Back" (Short story)
- Sometimes They Come Back (Film)
- The Exorcist (novel)
- The Exorcist (film)
- Hellboy (2004 film)
- Hellboy II: The Golden Army
- Hellboy: Sword of Storms
- Hellboy: Blood and Iron
- Hellboy: The Science of Evil
- Hellboy: The Black Wedding
- Hellboy: Pyramid of Death
- Hellboy: The Yearning
- Hellboy: House of the Living Dead
- Hellboy: The Chained Coffin and Others
- Hellboy: The Right Hand of Doom
- Hellboy: The Troll Witch and Others
- Hellboy in Hell
- Fantasia (1940 film)
- This Is the End
- I, Frankenstein
- Season of the Witch (2011 film)
- Doom 3
- Night of the Demons
- Supernatural
- The demons seen in Charmed or in Buffy the Vampire Slayer.
- Demons appear during an occult ritual in the 2016 Irish horror film A Dark Song, where they resemble decaying human beings.
- An invisible, immaterial and almost unkillable demon is the primary antagonist in the Denzel Washington film Fallen.