Dark Headcannons for the Demon Bois, part 2.a : Physiological Adaptations and Defense Mechanisms (physical)
I continue this ideology with more horror HC's (kind of) detailing some of the physiology and physical defenses of our boys - HOWEVER there is quite a bit of science invested in this particular post, so there's a little explaining to do first.
Note: I have removed Iblis from the list for the next few rounds because we really dont know anything about her, and I've also removed Egyn because I have zero idea what kind of adaptations he has since no one's ever seen his body. Azazel is floating in kind of the same boat. We seen his clones, but not him, and we have only really seen two of his kin - from that alone its hard to tell. We haven't even seen Beelzebub except in Gehenna, and for all we know they are stuck there. Im basing all this off hypothetical and mythological sources as well as my knowledge of animal and human anatomy.
But first! (Yep, scientific Exposition Time Baby! I promise it won't be long) Something that strikes me odd is that all demons seem to be stronger physically than their non possessed counterparts, and so for the sake of not repeating myself where unessessary, we will assume this is due to increased muscular density, as a default which is the same thing that allows much smaller primates to be much stronger than ourselves.
However, be aware that there are MANY factors that influence physical strength alone - efficiency of respiration, bodily waste management (aka, kidney and liver function) and efficiency of metabolic processes (digestive system, pancreas, and again liver). I'll touch on all these things in their own right, but just to let you know, everything is interconnected.
Is, in everyday scenarios, about 7x stronger than the average human. In times of high adrenaline that can shoot up to 10, due to possessing a unique respiratory system, detailed below.
Samael has a physique designed to be an ambush predator, with a body that puts nothing to waste, but he is also built for bursts of speed and agility, both skills vital for his hunting strategy type, detailed in part one, to be effective. Standing out in a crowd may lull prey into a false sense of security, but it also draws a lot of attention from competitors, as well as parasitic predators like Chuchi and Coltars.
Samael is a demon often depicted with avian wings, and for his body to put out the strength it does and be able to at least glide requires an avian-modeled respiratory system. In other words he breathes with lungs, but has additional air sacs in his chest and abdomen to draw as much oxygen from the air as possible. For a demon optimized for bursts of speed and high agility, being able to metabolize large amounts of oxygen very quickly is vital.
More vital still though is having the kidneys and liver to be able to handle it. I suspect he would have a lobed liver akin to a rabbit, and kidneys much like a cat. Technically speaking, if he eats right, he never actually has to drink any water. His kidneys are that efficient.
Now onto the fun one: bones. High density muscles put out huge forces on the bones they are attached to. There are two ways to fix that: make the bone harder and denser, or make the bone softer and flexible with cartilage. Samael does the former. The most efficient way to have denser bones without adding weight is to make them hollow, at the sacrifice of not having much bone marrow. This works out perfectly though, since to metabolize high rates of oxygen you need specialized red blood cells with lots and lots of hemoglobin, and hollow bones allow for the production of just enough of these cells.
Now that the basics are out of the way, Samael has some other unique adaptations, including a ratcheted tendon system in his forearms, like those found in raptors. This gives him a virtually unbreakable, iron-strong grip from which escape is virtually impossible. Combine that with talon-like claws and long fingers that can really dig in, and you're screwed from the word "go".
Making that escape even more impossible is his highly flexible joints, which make twisting out of his grasp before he has a chance to bite damn near unheard of. Remember, it only takes one bite to kill. If he catches you, you're dead already.
As far as defensive abilities go, Samael hasn't got any besides evasion. So much of his body is devoted to being a specialist that there isnt any room for special physical defenses - in fact his hollow bones, while very good at handling internal stresses, are no less brittle than a birds when it comes to some external forces. A sledgehammer to the side of his thigh (impact) would absolutely shatter his femur bone, though he can land on his feet from a great height (compression) and barely bruise.
Is maybe 5x stronger than the average human, on a really good day. He has a bit of muscle, but he is a magic user, not a berserker. On his bad days he can dip below a 1.
Physically he isn't too different from a human mostly, other than having an ultra efficient heart and lungs that are 20% larger to compensate for his increased muscle density.
Except that he has very strange cells. To all appearance his body is mostly human, but one look under the microscope would tell you instantly that something is odd about this duck, because his cells have tiny crystals in them. These crystals are of unknown composition, but they are thought to assist with fluorescence, or the production of the stuff mentioned below.
Also odd about his cells is that they're filled with an almost cellulose like substance instead of normal cytoplasm. Its a bit denser and is THE most heat resistant organic substance on earth. It also makes his cells completely immune to all forms of radiation - this boy could literally survive a nuclear explosion as long as he was in a shelter where he couldn't be impacted by debris or the shockwave. Heat and radiation from it would be like a sunburn at worst.
However, he is not fireproof. While this substance is resistant to heat, it is not resistant to oxidation, so it WILL burn. Not well, and not fast, but it will burn.
Which leads me to the fact that he has some very unique organelles. Multiple types of mitochondria, Golgi bodies and ribosomes help manufacture the weirdness.
Part of that weirdness is of unknown deadliness though. When fully charged up, the light he emits contains dangerous wavelengths, and further study has yet to be done on whether and what types of radiation he may emit. It is known that his dense cytoplasmic substance can hold onto nuclear radiation, but does so very briefly.
As far as defenses go, he does actually have a pretty interesting, but accidental one, for the dense cytoplasmic substance of his cells naturally permeates into his blood plasma. This substance is extremely bitter and even potentially toxic at high enough doses. A mouthful of Lucifer's blood is enough to induce severe nausea, vomiting, cramping of the intestines (colic), and if swallowed, diarrhoea.
The strange substance of his cells also mediates the use of Elixir that is specific to himself. Elixir used for other purposes are rejects of the ones formulated just for him, and are effective at treating a wide variety of things.
On a related but unrelated note, though, the elixir has nasty side effects on humans and demons alike, often triggering the onset of various cancers and cysts, though it's not clear why this happens to some and not others. It is not known why Lucifer is seemingly immune to these side effects, but he could, potentially, be immune to cancer altogether.
Amaimon is a fucking draft horse, with a baseline strength of 9x that of a human. That's somewhere slightly above a pissed off gorilla and/or an attacking tiger, for reference. In high adrenalized mode, that number shoots up to a 12, which is about as high as biology will let anything go, courtesy square cube law.
His muscles are SO dense and heavy, in fact, that he is incapable of floating in water. He also isn't very fast for long distances. He has high stamina at low energy output, and low stamina at high energy output. He can walk for days on end, but in a dead sprint he can't go more than a kilometer at best before his muscles start to rip him apart.
Which leads to : bones. Amaimon takes a very reptilian approach to the issue of having super powerful muscles, and has fibrin and cartilage reinforced bones that bow rather than break. However, these bones have many sharp angles for muscular attachments, and as a result are very poor at resisting torsion (twisting) and high rates of compression. The last thing he wants to do is land on his feet from a great height, for he is likely to fracture his long bones.
But those are not the only bones he has - much like monitor lizards, including komodo dragons, he has ossicones embedded in his skin, forming a chain-mail mesh of steely bone just below the dermis that makes his skin very resistant to slashes and cuts, but very weak to stabbing and thrusting. Cleaving into him wont do much damage, but impaling him on a pike works great.
His organs are strange, made stranger by his blood, which has a pH value of 7.8, far more alkaline than most viruses or bacteria can survive, making him virtually immune to disease. Unfortunately that also impacts the bacteria in his gut, which as a consequence can exist nowhere else on earth.
On the flip side, his stomach secretes acid that is so caustic it dissolves bone in hours, and also destroys even the worst of pathogens. As touched upon before, he can regurgitate this acid onto attackers in self defense, even going so far as to spit it at them from a distance of two meters. It has a patently unpleasant odor too, adding to its defensive quality.
Amaimons claws are semi retractable and grizzly-like, making them excellent tools for digging and prying things apart. They're also really good at ripping people apart, and there is no armor that can really do effective justice except for one: spiky. His skin isn't super resistant to impalement, remember, so the pricklier the better. That is assuming he cant chip away at it. Good luck with that.
Another organ to mention is his tail. It's not exactly prehensile, but it is flexible and very, very powerful. One whack across the midsection could kill a man. In fact his tail is often his first line of defense against attackers; it's so robust and armored that it's almost impossible to injure, and it hits like a truck. Good for offense or defense, or even just lazing around.
Fungi boy has an average strength of just twice that of a human. But when pushed to his limits, he can use hydraulic musculature to increase his strength to 9x that of the average human.
Speaking of which, Astaroth has some weird musculature- or lack thereof. Rather than having ordinary, dense tissue, he instead has a hydraulic system of movement akin to that of a worm or slug. Not only that, but his muscles are not his own - rather they are controlled by slime molds, with which he has a symbiotic relationship. The muscles are very little muscle tissue and a whole lot of mycellial fibers. His body is literally made of fungus, controlled by fungi and microorganisms, and is fed and defended by these things.
He is, in light of this, able to turn his body temperature on or off in any area he needs to at-will, giving his slimy friends the home they need.
He has a perfect mastery over the simple organisms he controls, and can exchange them at will. This combined with the ability to live without body heat means he is completely immune to all but the most severe of environments. As long as he has access to moisture, he can survive and thrive at sub zero temperatures and well into the triple digits. However he can not live without his slimy friends, and so can not endure drought very well. Deserts are the bane of his existence.
When it comes to defenses, Astaroth is nothing but. Toxic spores, all colours of miasma, foul smells, and even sharp needles and thorns when necessary. Nothing with a lick of sense would dare try to eat him, with the exception of microorganisms and parasites thereof - but it's not him they consume, but his symbiotes, which again he can simply discard or exchange as need be.
He is however very slow moving, typically, and doesn't really have a 'flee' or 'fight' response. Instead he freezes, exuding and oozing his more unfriendly companions to deter attack. If this should fail though, however unlikely, he is remarkably fragile and slow to heal, though virtually impossible to kill.
His only real weakness is well established: fire. It is the great sterilizer, though light is also not something he can easily defend against either. Neither are vacuums and immense air pressure. Basically if it's not within the realms of ordinary natural phenomena he has no ability to escape or defend. This gives him an edge against the younger of the Kings, but makes him powerless against the older half.
Whew! That was a lot. This post took FOREVER to make!
Questions and comments are welcome, reading with a grain of salt in mind is recommended.