Daemon

refers to entities founded within the Sixth Imaginary Factor.
==Overview==
Daemons may be viewed as allies of humanity, who exist so as to empathize with and resolve the sufferings of humanity. Despite this, is treated by humanity as the greatest of obstacles.
So as God is to , so as Daemons as an existence are to . They are to humans as an abyss that lies within arm's reach, yet decisively beyond comprehension. Daemons, however, are not to be confused with ,
 a more general category of existences.
But the manner of existence taken by "Daemons" and "Demons" is in essence indistinguishable from that of a lifeform of higher order that inhabits upon .
In sum, said existences can, per the recognition of the , no longer be discerned as "human." Their existences would approximate to that of the of a certain fictitious Mythos popular in the 20th century. It is said that True Daemons are similar to the gods described in the mythos.
In the world of Fate/EXTRA — whether by way of Daemonic possession, or in the circumstance that one's own actions bring about a transformation into a Demon​ — it is said that the process whereby a True Daemon is birthed unto the world has, as of the present day in 2030, not been brought to fruition even once. Conversely, the wording in Extra CCC Material suggests that if the psyche of a human host is capable of withstanding possession without collapse, it is possible for a common Daemon to be uplifted as a .
==Daemons==
 are existences founded within the Sixth Imaginary Factor, called forth passively by human desires and get born from their wishes within their human psyche. They act to realize the wishes they come to be invested within, because of their , by distorted means. They gain a form fabricated by human thoughts and then materialize as .
In general, a Daemon usually takes possession of the human that birthed it, utilizing it's corpus to incarnate (受肉, Juniku) and to take action. But in the event that the mind of the host cannot withstand the strain, it is common for the self-destruction of the host to occur, dispersing the essence of the Daemon into the vicinity. Upon possession by a daemon, irregularities manifest in the the victim's body, eventually rendering them as grotesque monsters by the metamorphosis of the flesh.
And unlike True Daemons, they are existences that can obtain being by the imposition of a . As Daemons attain true freedom upon receiving a Unit Designation, it is a general rule that the naming of Daemons is not an act to lightly engage within. For example, Goetia describes his component Demon Gods, which are a Higher-order information lifeforms,Fate/Grand Order: Epic of Remnant - SE.RA.PH. - Deep-Sea Cyber-Nirvana - Act III: The Nutcracker, Once More as existences that had obtained discrete Names and Powers.
 The Demon God Phenex for example, is governing death and rebirth, similar in fashion to the Phoenix. As such his unique ability, is reviving by itself after being killed.
These High-ranked Daemons can choose who they want to possess, are capable of controlling the physical manifestations of their possessions, grant their powers to their hosts or access the powers of said hosts. Making their detection difficult, and it is likely that a disaster becomes inevitable in the event of their discovery. The Demon God Zepar sought to regain his lost body, so he needed to seek refuge somewhere to regain his strength. He choose Kiara Sessyoin as its host for possession and slowly eroded her personality. In order to turn her into a proper host for himself, he linked her mind to that of another self of her and ultimately the original Kiara had been entirely replaced by her counterpart. But Zepars plan failed because he, as a spiritual being, is not familiar with things like physical pleasure, which allowed Kiara's counterpart to break and dominate Zepar. Kiara turned into a Demon that could freely manipulate Demon Pillars and in the end metamorphosed into a Beast. The Demon God Raum possessed Randolph Carter's body while Randolph's mind was travelling elsewhere. 
Yet there are a few ways for employing Daemons as Familiars, such as the knowledge of the manuscript left behind by Solomon or by binding them via a contract after being summoned. While in Tsukihime (Remake), exist the Four Great Daemon Beasts of the Dead Apostle Ancestor (Remake) Merem Solomon who he imagined and brought into reality through his ability, they continue to serve him out of debt and loyalty without a Unit Designation. In DDD, there exist the Four Daemon Limbs who are bound to Kaie Karyou because his wish, of gaining a 'human form', was realized by turning his emotions into Daemons and each Daemon received a Unit Designation accordingly with the emotion that they were made from.
===Daemon Possession===
, as opposed to the Japanese understanding of possession, in which spiritual beings such as a kitsune or inukami intentionally invade the body of a human to take control over it. This particular phenomenon works more in accordance with Western beliefs, in which something unnatural unintentionally attaches itself to something natural and corrupts it from the inside out. Humans cannot comprehend the reasons behind the possession phenomenon due to the randomness of how it happens and they might as well take it as an accidental event. However it is mostly caused by a Daemon, who takes possession of a virtuous human with a healthy body.
In its early stages, the only noticeable sign of a Daemon possession is a change in the host’s behavior caused by gradual loss of the capacity to reason as a human being. Being unreasonably offensive or coercive towards one’s surroundings are common symptoms at this point. If left alone, the Daemon inside the individual will start to imprint the shape of his own imaginary self over the body of his host. This process starts with subtle unthinkable changes in the operations of the human body and culminates with mutation of entire parts of the flesh. The degree that these mutations can reach is determined by the Daemon's strength. But fortunately, a Daemon's shape is one that is biologically impossible, this transformation process usually turns them into grotesque monsters, a mature Daemon, and it is common for the self-destruction of the host to occur.
And yet, just like how Magi can become Vampires, there are those rare cases who are able to resist the transformation. They continue to survive, by making use of the Daemon to extend their lifespan, even as their own soul is being consumed. 
Daemon Possession can not only corrupt the body of its host but it also causes many forms of supernatural symptons like rap sounds in the surroundings or the sound of splashing water, much like the presence of poltergeists. These are more or less the symptoms of a Daemon Possession rather than Daemon Possession itself. Daemon Possession is a disease that only affects the host. It is a poison that does not spread to anyone else like a virus would. However, only the host can be aware of the presence of the Daemon during the early stages of possession, for it isn't known by others that someone is possessed until they transform. For Daemons cannot be seen by humans and are cunning enough to suppress these symptons as much as possible, that they would usually cause, in order to prevent detection until they reach maturity. So discovering a case of possession in its early stages is difficult. Once they turn into, a fully matured Daemon, they will distort the mentality of those around its living ground, turning it into a hell on Earth.
The Holy Church sends out Exorcists to track down and deal with them. It is important for the Exorcists to find the Daemon before it can develop itself. For this reason the Church values people like Caren Hortensia who can act as a Daemon detector and employ them as assistants for the Exorcists. For a regular Exorcist lacks the necessary power to banish a fully matured Daemon, so in these cases there is no choice but to call in an Executors to destroy both the host and the Daemon together. The only known Exorcist to ever exorcise a full grown Daemon from a person is Mr. Dawn from the Burial Agency (Remake).
==True Daemons==
 are demonic beings that can exist without obtaining a from humanity, or cladding themselves in .
Distinct from those Shades that appear in Fate/stay night, which exist only as imitations, these are the real thing - Enfleshed Daemons (受肉した悪魔, Juniku-shita Akuma, lit. "Incarnated Daemon") with which humans can't hope to compete with. In Fate/hollow ataraxia, they are said to be authentic Daemons brought forth by the Lord, who were as they were before being named by Man. It is said that True Daemons are similar to the of a certain fictitious Mythos popular in the 20th century.
It is said that are one of the top three most powerful beings in the entire Nasuverse when excluding Servants.
Fate/hollow ataraxia gives that — as in the circumstance of a Holy Grail — True Daemons possess as a faculty the capacity to give shape to the miracle of Magecraft merely by the release of Magical Energy. Unlike humans — who exercise Magecraft by way of Magic Circuits that are essentially pseudo-nerves fabricated after the body's nerves — True Daemons possess nothing so much as Magic Circuits. The entirety of their vital processes serve as faculties that exist for the purpose of calling forth Demons, and they exercise a Magecraft of an order beyond human ability.
==Variants==
===Daemon===
===Greater Daemon===
===Archdaemon===
==References==
it:Demone
vi:Ác Ma
Category:Creatures
Category:Life
*
Category:Characters by species
Category:Magecraft terminology
Category:Terminology in Fate/stay night
Category:Terminology in Fate/EX
Category:Terminology in Fate/Grand Order
Category:Terminology in Tsukihime
Category:DDD