#mental eelness...........

*There are (at least) two demonic languages: one is a bit like Latin albeit way more fucked up. The second one is spoken only. A human can learn to understand both but the second one requires a lot of concentration to discern due to the subtlety in the growls, clicks and other noises demons are capable of making. It’s also very dependent on body language, especially in demonic form.

*It would be nearly impossible for a human to be fluent in the second one because of that. (unless you’re like. A really good mimic?)

* the second one is the oldest language. The new language and it’s written counterpart are derived from it with a little twist, so you’ll still hear some interesting noises thrown in there. It would take some dedication to learn, though the written part is fairly easy once you get the hang of it. It was made to be read quickly and efficiently. The speaking part however...................good luck.

* Demons and angels can instantly pick up human languages including reading and writing. Wouldn’t do you much good to be summoned in like. Germany and not know the language LOL

* Demons purr LOL you can’t click and growl and NOT purr. Like cats, it is both a happy thing and a self soothing thing.

* There is a slight difference between a happy purr and a self soothing purr, but the difference depends entirely on the demon.

* Demons (and angels) are nearly impossible to kill. It’s also very hard to damage them in any meaningful way. They also heal very quickly, so even if you did get a good hit on one, if they managed to get away chances are they’d heal in a matter of hours.

* Stronger demons like the brothers are even MORE impervious to damage. The amount of times Beel’s reached into the oven barehanded just to pop a piping hot cookie in his mouth is insane. He swears it’s the best way to eat them.

* Angels are very stiff but very physically powerful. They have a lot of control over their bodies and are trained from a young age to be able to wield that power responsibly.

* Demons on the other hand are incredibly flexible and bounce back easily. Though your average demon might not be the same physical strength as an angel, they have agility on their side. Angels are heavy hitters where demons rely on their ability to strike multiple times very quickly.

* This was a very weird transition for the brothers, though the amount of strength they had barely changed between realms. Fallen angels don’t change that much strength wise, but a little bit is burned up in the fall (to protect themselves.)

* Angels may be strong but demons also posses a massive amount of strength and have to learn to control it over time. This is known as a “juvenile phase” but it happens at different ages depending on how they were born. Fallen angels do not go through this as they have already learned to keep a grip on their power. Do I have an entire separate post ready about this bc I just couldn’t shut up? Maybe...

* There are four ways of being “born” a demon. Fallen angels, half demons, human borns and natural demons.

* Humans can choose to be turned into demons, but it is a very painful process and they won’t be able to gain any strength, what they get is what the get. They are referred to as “human born” and were considered the lowest of the humanoid demons until Diavolo came into power.

* Human born used to just be made whenever by whoever but that caused problems. Demons would make human borns and then just leave them to flounder about by themselves in an unknown territory. Diavolo’s father put an end to that during his reign, but “accidents” still happen. Now you have to do paperwork if you want to turn your human friend/lover into a demon lol.

* The ceremony for turning humans into demons is incredibly complex, which is why banning making human born unless given permission is less of a problem than you’d think.

* Half demons are just that, they’re only half demon. Most are half human but there are a few other kinds of magical creatures mixed in there. They aren’t as strong as a natural demon nor a fallen angel but they can gain power through their other ancestry. Many of them specialize in unique kinds of magic.

* Half human/demon children aren’t as rare as you’d think they are. This is due to the fact that demons have all sorts of ways to keep a demonic baby alive. Ranging from shapeshifting and (magically) taking the baby themselves once it’s grown enough to handle the transition to various forms of potions and spells to help a human along.

* Half demons and natural demons have the luxury of being born already (mostly) acclimated to the devildom, making some of the transitions that come with a demons lifespan easier on them than human born and fallen angels.

* Angels are taught to control/ignore their instincts where demons are taught to rely on/embrace theirs. Because demonic instincts often work against the things taught in the celestial realm fallen angels have a hard time adjusting to their new environment. Though, as their sins overtake them, their instincts become easier to fall back on.

* Demons have multiple forms, not just the two shown in game. All in all, the brothers have 5, each becoming less and less humanoid.

* Half/human born demons are more likely to have both a tail and wings in their first demonic form. Stronger demons like the brothers are merely showing off the strongest of the two, but everyone has both. (Bc I think they slap LOL *points* u get a tail and wings! *u get a tail and wings*)

* •a demons features can be influenced by what sin they are, but it’s not a hard or fast rule. Don’t be surprised if a demon who looks more akin to Mammon is actually a Sloth demon.***this does not apply to little Ds who’s look is entirely dependent on their sin. Little Ds are an entirely separate conversation 😈

* human borns/half demons can have two sins assigned to them, though this makes them less powerful in both. Usually there is a more prominent sin.

* Diavolo’s rule has helped quite a bit with bringing humans into a new better light, and many natural born demons who haven’t been able to interact with the human realm have become increasingly curious about humans and the way they work. Much of this is due to media that was brought from the human world to sedate Dia’s intense curiosity.

* In the eyes of many older demons, humans are merely playthings and it is expected that most demons will eventually mate with at least one other demon. A human and a demon dating is seen as just infatuation on the demons part, and it’s often thought that there are no real feelings behind a relationship like that. However there have been/are many successful and happy human/demon relationships.

* Demons don’t really have a concept of marriage. They live so long there really isn’t a point to tying yourself to one single person (or a few people) However, that’s not to say that there aren’t relationships like that. There are binding ceremonies for expressing love and devotion to other beings and it has its own unique culture.

* though the gates to the human realm are still technically closed and have been for a long time, demons can still be summoned by witches (sorcerers, wizards, warlocks, whatever you call yourself.) They can also be successfully summoned if you are not a magic user, however this is rare and often can go wrong, much like horror movies.

* Summoning very powerful demons like the brothers is incredibly hard even for an extremely experienced magic user, so often the demon you get claiming to be Satan really isn’t LOL. There are demons who are actually assigned to go to summonings in the place of the seven lords of hell, but many demons will just take on the role to fuck around with whomever summoned them. You think a prince of hell has time to just go possess some object or person for fun? (Ok...Mammon Satan and Belphie might.......if they’re bored enough LOL)

* Demons are actually relatively cuddly creatures. They might be a little rough with strangers but base instincts with family members will always be to coddle rather than fight. They’re more like humans in that right.

* Angels don’t do much casual touching, they’re very uptight. Beel and Belphie being as close as they are was a bit of an oddity in the celestial realm. That’s not to say angels don’t need causal touch lol just that they were trained to avoid that “temptation”.

* the brothers had a hard time starting out in the Devildom because of this. They still have a hard time with casual touches, which is why they seem so touched starved with the MC.

Things I might elaborate on later:

* There is a difference between demons, incubi and succubi but it’s not what you think it is.

* Demons, angels and humans all have very different takes on gender.

* The juvenile phase (DO not tempt me I wrote out like 1000 words about it bc I couldn’t shut the fuck up)

* Animals in the Devildom are fucked up. I WILL fucking talk about this bc it’s my passion.

* Pacts and how they work..........

Here’s some things I said in my first post that are relevant here, slightly edited. (I elaborate more on the different ways demons are born in that post and I think they’re pretty self explanatory, but u might wanna go read it just in case it’s not clear enough 😔 sorry): (link to first post)

* Demons have multiple forms, not just the two shown in game. All in all the brothers have 5, each becoming less and less humanoid. (Most demons only have 4) 

* Half/human born demons are more likely to have both a tail and wings in their first demonic form. Stronger demons like the brothers are merely showing off the strongest of the two, but everyone has both. (Again bc I think they’re sick as fuck lol) This is why the stereotypical devil in our world has both wings and a tail. 

*a demon's features can be influenced by what sin they are, but it’s not a hard or fast rule.**

***this does not apply to little Ds whose look is entirely dependent on their sin. They are an entirely separate conversation 😈 (I elaborate on this briefly at the very end LOL) 

* half/human born demons can have two sins assigned to them, though this makes them less powerful in both. Usually there is a more prominent sin. 

*It should also be noted fallen angels do not have a juvenile phase. While the powers they develop after the Fall are different, they already come prepared, having had intense restraint implemented in their training in the celestial realm. The only things they develop are tails and horns, which happens very quickly during the Fall. They still have the same instincts as demons lol they are just much better at maintaining control. 

*another note: I’m gonna use acronyms for our different types of demons after a while to save me some headache. They’re pretty self explanatory (Ex: half demon = HD) 

With that let’s begin, shall we? 

~~~

*All demons are born with innate magical abilities, the juvenile phase is just the manifestation of their sins and some of their power. Some powers do not come into fruition until much later in a demon's lifespan. (Will elaborate later) 

*They won’t have a complete hold on their powers after this either, it’s just like. The bare minimum of getting a grip so they don’t cause immediate damage LOL they have many years to get into the nuances. Magic to demons is about as easy as breathing, but it still comes with its own challenges. 

*Many of the powers that manifest are shaped by what kind of sin(s) they display. I’m gonna say the sin(s) developed depend on the individual rather than it being hereditary. Though there are powers that are inherent to all demons. (i.e. hypnotizing humans like in lesson 11-14)

*The beginning of the juvenile phase starts when a demon develops their horns, wings, claws and tails. 

*For almost every demon, the juvenile phase lasts about two or three weeks. A human born’s phase will immediately kick in the day after their ceremony. Because of a half demon’s heritage, their transition is delayed and will usually happen around “middle school” age. (However many thousands of years that is lol. Also imagine going through puberty AND growing a bunch of extra shit.........smh.) 

*Natural demons have it slightly easier, they go through this phase very early (around toddler age). They develop the nubs of their horns, wings and tail a while after they’re born. 

*However this is NOT easier for whoever is taking care of them. Demons that develop later are mostly self-sufficient, meaning you can leave them to rest a bit. Can't leave a baby alone for very long though, can you? Especially not when they’re hurtling objects around with their mind, or causing things to spontaneously combust. (Also imagine a regular baby during their teething phase……….now imagine a baby’s teething phase being ten times more itchy AND manifesting new powers. Congratulations on your very cranky and powerful baby, best of luck to you.)

*Parents take this in stride as it’s just how demon babies are. It is all very Addams family esque…. like awwww, our baby just tried to induce horrific hallucinations of our own deaths!!! 🥺🥰🤧 they grow up so fast!!!!

*HB and HD wings and things grow in very quickly. The nubs will sprout from the skin and then mature into wings and horns in just a few days. ND transitions are much more drawn out, taking about a week to complete. All the growth is very itchy for everyone though. 

*You know when you have an itch that just won’t quit or that you can’t reach, so you have to use some outside force to get some relief? Same concept here. Much like deer and their antlers, demons rub their horns and wings up against things to get to those spots they can’t get to themselves. It also has the added effect of encouraging growth and getting excess skin/keratin off them. Family members often help with preening and scratching. 

*There are special concoctions/spells to make the process easier and to help ease the itchiness. As well as products made for specific purposes, like to get at that space where your wings meet your shoulders lol 

*There are also things to pad horns. Having your baby demon impale your shins is no fun. Neither is having your best friend accidentally get stuck in the cabinet because their horns went through the shelf. 

*The first week and a half is usually when a demon is most active. They are encouraged to play fight, stretch their new wings and become familiar with their new instincts. 

•Play fighting is a way to help learn to readjust to their new strength. (and thank god demons are near impossible to kill lol they can get VERY rough.) It’s also considered a bonding activity. 

*Hunting instincts also come into play so it’s not uncommon to see a demon in their juvenile phase playing a really fucked up game of hide and seek with their loved ones (no one gets hurt. Probably <3) 

*These two skills also help with learning how to fly. A game of fucked up hide and seek in the forest is both fun and educational. 

*This is very much like when puppies' paws are too big for they got damn them, except y'know. with horns and claws. So expect some accidental scrapes and

*This is also usually the time where their sin(s) will manifest, along with their new powers. At this point this is where family comes in, as a newly developing demon is reliant on everyone around them to help them learn how to control their strength/powers. Taking care of a demon in their juvenile phase is a family bonding activity, and even those who are prone to being cold are a bit softer during this time. (A reminder that family can be anyone, not just blood related.) 

*The second half of their transition is more about conserving energy for the introduction of their final form.  

*Nesting instincts kick in and are important here, because any nest created will be that demon's home for a period of time. They won’t stray very far from wherever they’ve chosen to stay. Nearly all demons will just choose a comfortable place in their home to nest, however, some demons (i.e. demons like Levi) need a special place because of their final forms. They will be drawn there instinctively.

*A nest is just composed of soft material and sometimes extra objects. For example a greed demon might want shiny or precious objects around their nest. 

*This will also be the home of the loved one(s) taking care of their demon. They will go out and find anything the other one might need or want. A demon will only choose one or two others to take care of them at this time. Other family members are allowed to visit, but the chosen demon(s) stay with their struggling one for nearly the entire last half of this period. 

*It’s considered an honor to be chosen and it is a bragging point, especially if you have been chosen multiple times. 

*Despite what you might think, parental/domestic skills are very important to demons. They live a very long time, and it be a waste to treat their spawn poorly. They’re stuck with them for nearly an eternity, so you might as well try to do your best with them. Being able to showcase being chosen to whomever your courting is, how you say.............a little sexy. So being chosen multiple times? “Wow you’d be a great parent? Tell me more…..😳” 

*Demons will slowly spend more and more time in their nest as they approach the end of their phase. Growing extra things takes a lot of energy! Many demons end up mostly sleeping for the last couple days in preparation for the end. 

*Since they are so sleepy, this is the most outwardly cuddly most demons will be. Close family members are encouraged to come stay in the same space for a while. The demon will often be asleep, but waking up and playing games with them is a great way to bond. If you’re REALLY special you might end up being allowed to sleep in their nest for a bit. 

*The juvenile phase culminates when the demon reaches their final form (usually the fourth one.) Over this last half, they slowly grow more monstrous features. Scales, fur, claws, eyes, teeth, spines.........the whole lot! Anything and everything you can imagine. Each demon's final form is unique, though they do not get a decision as to what features they have. Final forms tend to be very large. 

*This is where they are taught how to use their glamor and how to piece themselves back into a form that’s easier to maneuver. Think of it like starting from the top and working your way down. 

*There are demons whose job it is to go mark down the details of every single final form. Things like what powers manifested, to how tall they are, their overall physical strength and what sin(s) they portray, etc. They are all recorded in the royal archives. It’s a bit like a right of passage, especially for younger demons and their parents. 

*Going back to the very top, some powers won’t manifest until after the juvenile phase. Some won’t even manifest until the demon has hit sexual maturity (which takes a MUCH longer time for demons.) This is true of almost every power that Lust develops except for perhaps an increase in their charisma/ability to charm. Demons who are assigned Lust are considered the late bloomers of the demonic world, as almost all other sins manifest more power right away. 

*Also relating to the top of this post: the reason Little Ds looks are biased on what sin they are is because they are pure concentrated forms of sin given life. They’re extracted from the souls of humans who committed sin, and used for grunt work/errand running. They develop their own personalities as they go, but it takes a bit so they’re kind of a blank slate until then.

~~~

I was gonna be like oh treat for you here’s how the brothers dealt with Satan and his juvenile phase but this is long as FUCK already so I will make…...a separate post. Edit: SURPRISE! treat for u! heres the link if u want