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#dont @ me about the incorrect planet science im doing this for fun and idc lmao
fallstreakfeathers · 3 years
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[More] Obey Me Headcanons
[ I didn’t edit this at all, really, but I have around 30 headcanons so far that I’m using for my fic and would like several backups- so, I’m posting it here.) 
The ‘Devildom’ is a planet that is larger than ours. ‘Hell’ refers to a part of each territory the Avatar’s govern that is reserved for retaining and torturing human souls. These areas are actually quite small compared to the rest of the land. Each environment is unique, with its own native flora, fauna, land formations, climates, and dangers.
The Devildom resides on a tall, mountain-ringed plateau that towers over the lands around it. It is not the tallest point in the demon world.
Demons have elemental affinities that also define certain weaknesses. A demon that’s used to the heat and gasses of flowing magma would have difficulties in the colder parts of the world, or fighting against a demon or creature who uses a lot of freezing attacks.
There are many places in their realm that even Demons refrain from going, or simply cannot. One such area is a vast frozen land in the far northeast that drops to temperatures low enough that even demons that are developed for icy area’s cannot survive without magical assistance. However, this also makes the area a great place for criminals and the exiled to live should they be able to fight the cold. Demons and such that failed to pass the test of the cold are frequently found encased in the tall, pointed ice spires that jut from the ground- trapped in an unending preservation until the end of days.
There’s a massive crater in one part of the world, in the land Mammon governs, that’s referred to as the ‘Fear Pit’. It’s the aftermath of a massive battle between two demons, and the entire area is cursed with illusions that prey on your fears. It gets worse the closer you are to the bottom. Demons occasionally travel to test their own resolve, though few ever make it to the center- usually opting to turn back before their fear drives them mad.
Beelzebub dislikes thunder because it sounds similar to some sounds he heard in the war
Demon’s are immortal only in that time cannot destroy them, They can still die from wounds and even disease.
Not all demons can speak human languages. There’s plenty in the Devildom/Hell who’ve never set foot in the human realm and have never bothered to learn the realms languages.
On that note, there are more than a few specific demonic dialects spoken in the devildom. The Avatars and most high nobility are required to be fluent in the most common 3 demonic languages.
Demons who came to the Devildom by falling from the Celestial Realm are not considered ‘true demons’, and many have challenged the Avatars solely because of their origins
Demons may have pacts with multiple humans. If a demon who has more than one pact is ordered to do something by multiple pact holders, the demon will obey whoever has the strongest bond with them OR the orders will cancel each other out.
Many species found in the Devildom/Hell and the Celestial Realm are not exclusive to one or the other- dragons and unicorns are found in both, for example, but with different traits and personalities. Dragons in the Devildom are ugly things that spit an acidic venom, while those in the Celestial Realm are sleek and able to shoot blasts of fire from their throats. Some creatures remain the same in each realm, but are referred to by different names. Many mythic creatures from every human culture can be found in both the Devildom and Celestial realm
Though their human forms look rather perfect, everyone who fought in the Celestial War bears a great number of physical scars, some of which affect their human guise as well
Belphegor's right eye is completely blind in all his forms. He tends to hide it in his human appearance because it’s sometimes seen as a weakness by other demons who might try to challenge him. He has the most trouble with demon’s attempting to fight him because he’s often seen as the weakest Avatar due to his sleeping habits and general outward appearance. This is, of course, a massive mistake.
Belphegor frequently wraps his tail around himself (like a hug) for comfort- particularly when he’s alone
Belphegor’s horseshoe was broken during a fight with a demon who wanted to challenge his title/status.
Demons don't usually bury their dead because many simply disappear upon death. How they disappear depends on their primary sin (Wrath erupts in a blast of fire)
Leviathan changes the order of the smiley pins on his clothes depending on his mood (green for happy/content, yellow for neutral, red for angry/upset)
Satan dislikes chocolate
Demons are practically infertile. Children born naturally (human standard) are extremely rare. As such, all demon children are cherished and protected by modern demonic societies as a whole, and intending to harm one is punished harshly.
Lucifer may have birthed Satan from rage, but a demon can create another being from any emotion so long as it’s powerful enough (love, envy, etc). This is much more common than the physical way of creating children. The offspring will generally exhibit whatever emotion spawned them and will behave accordingly to whoever the emotion was directed at. After their birth, they grow very fast until they appear 10-15 years old, and their growth slows immensely.
A specific ritual is required for a demon( or angel) and human to crossbreed with each other, as they are completely different species. It would be like trying to cross a dog with a giraffe. These births are always extremely dangerous for the human mother. There are a few exceptions to this, such as Incubi/Succubi but successful crossbreeding is still extremely rare.
The older a demon is, the more horrific their true forms are. Anyone who has existed before the Celestial War is referred to as an ‘Ancient/Old World’ demon. Those born after and those who fell are considered ‘New Age/Modern’ demons. There are a handful of creatures referred to as ‘Primordials’. These beings are neither demons nor angels, but are immensely powerful and are very secretive. Not much is known about any of them, and they rarely show themselves. They also rarely partake in the social/political conflicts of the three realms. They did not have a presence in the Celestial War.
These titles have no bearing on how civilised someone may be.
There are technically four realms known. The Celestial, Devildom, and Human realms are commonly spoken about but the fourth realm is known as ‘Oblivion’ and isn’t so much a world as it is multitudes of platforms floating throughout a nebula. It’s useless overall but is used as a prison and punishment for the worst of demonkind. Few have ever made it out, but those that have come back a blubbering, maddened shell of who they were. Diavolo and Barbatos both are capable of opening a portal to it.
All demons/Fallen have the capability to return to a monstrous form, but Ancient demons have a particularly difficult time making themselves look human again (some Ancient’s are incapable of returning at all). New Age demons are able to transform much more freely, but if the transformation is brought on by strong negative emotion (rage, fear, or a physical reaction such as pain), it takes much longer to change back
The final stage of demonic courtship involves seeing each other's truest self. This display is a form of trust in the highest regard, the goal being total acceptance of each other. It should never be taken lightly. Not every couple goes through this, but those that do form a deeply personal and permanent bond.
A demon in full form is rare outside battle, though some choose to remain in their appearance as a way of showing off.
Some demons (nobility and such) have several forms outside of their human/humanoid guises
Demons are compelled to chew on things. There are several businesses specializing in ‘demon chew toys’. Gnawing on these can release both stress and anxiety and also helps maintain healthy teeth.
Demons shed their horns, scales, teeth and fur, and will often use these shed materials in their own clothing, jewelry, and other such items. Shedding season differs for every demon- it happens to some every half year, year, couple years, or even centuries. Being given an item made from a demon’s shed is considered a personal gift
Demons can tell the basic emotional state of any human they have a pact with. Whether they react to it or care is another story.
Despite the common opinion that the Devildom doesn’t have a sun, the sky brightens every 3 human world days thanks to the passing of a dwarf star. However, it would be a mistake to believe that the demon world is devoid of light without it! There are plenty of natural light sources that provide the lands with a way to see (for those without night vision), such as glowing crystals and mushrooms, magma, etc.
The Devildom’s planet’s core burns hotter than ours, which counteracts how cold it would be otherwise (though it’s still quite chilly in many parts of the planet)
When Diavolo ordered that no human be harmed in the Devildom again, he also banned all media portraying humans as prey. These books, videos, and movies are now sold on the black markets and hoarded by those who disagree with Diavolo
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