Devil Slayer Magic (Per)

Devil Slayer Magic (滅悪魔法, Metsuaku Mahō) is a Caster Magic, Lost Magic, and finally, a subsection of the Slayer Magic line that grants the wielders of its power the ability to transform the physiology of their body into those of what could be considered to be a demon, which are a race of supernatural, often malevolent legendary creatures that can be loosely categorized as "doesn't fit in other races but definitely isn't human, also horn dealies" that are prevalent in religion, occultism, literature, fiction, mythology, and folklore; but of course, exist within the world of.

Just like how Dragon Slayer Magic is harnessed by those referred to as s, Devil Slayer Magic is utilized by those known as s (, Debiru Sureiyā lit. Demon Destroying Magicians) or Exorcist Mages (悪魔祓いの魔導士, Akumaharai no Madōshi).

Description
In order to learn Devil Slayer Magic in the first place, the hopeful wielder must have their magic "modified" by one of the, which contain notes on how to obtain as to produce a , very similar to that of a  teaching a human  to transform them into a. The Book of Zeref which passes on the Magical Barrier Particles of the element to the user modifies the user's magical origin with the book's own Magical Barrier Particles, inverted by the paper to not harm the user, which changes how magical energy circulates within their body, therefore causing their magic origin and own magical energy to become "demonic" in nature; thus a portion of their own power changes the user's magical power into that of a Devil Slayer; this process is known to be exceptionally painful unlike the methods to create other wielders of Slayer Magic, with not many surviving the process as it risks the hopeful wielder of Devil Slayer Magic having their Magic Origin corroded along with their soul, potentially involuntarily transforming them into another with no real will of their own; the process has a ten percent success rate. Through continuous reading in a similar manner to how a obtains their  from studying a grimoire, the knowledge embedded within this magical tome will become permanently engraved within their mind as the now-harmless Magical Barrier Particles contained within the Book of Zeref will be put into action alongside the energy of the user's body to catalyze a variety of bodily processes automatically, therefore allowing the morphing of their physiology to a point where the individual has adopted some physical traits, as well as the type of Elemental Magic, from said book; or rather, what the book is known for – the. Interestingly, out of the three "main" Slayer Magic styles, which consist of Dragon Slayer Magic, God Slayer Magic, and itself, it seems as if Devil Slayer Magic has the most power—as a user is capable of devouring the elemental magic of its peers. In addition to this absolute dominance over the user's element, they are capable of controlling the element of others with hand motions.

These changes in their biological traits and structure range from rather unnoticeable things such as enhanced senses, which are a physiological capacity of organisms that provides data for perception, such as olfaction to the point that they can smell blood on a shirt even if it's been through the dry-cleaners or discover a forest fire even from several thousand kilometers away, audioception, which grants them a minor form of extra-sensory perception that allows them to detect movements through a form of clairvoyance, and ophthalmoception, bestowing upon the wielder of Devil Slayer Magic the ability to see things with pin-point accuracy even if it's a fair distance away and gain a form of night vision, allowing them to see in low light conditions – these are all traits associated with the, whom consider themselves to be above the existence of mankind, and their physical power when compared to humans definitely proves that. Despite the boons bestowed upon the user, those traits above can be said to simply be side-effects of having the physiology of an Etherious; indeed, the greatest ability of a wielder of Devil Slayer Magic is also its signature power – calling upon the assets of an Etherious even if their bodily structure isn't one-hundred-percent the same as the beings from which this magic originated, the caster is capable of inducing a metamorphosis of their body structure as to take upon traits of a Etherious instantaneously which is done in conjunction with the activation sequence of their particular element, bestowing upon the user of Devil Slayer Magic the power to reinforce their biological structure with the power of their particular form of Elemental Magic which itself is bolstered through simply being taught by the likes of demonkind, resulting in the physiology of a Devil Slayer transforming their entire existence into that of a make-shift weapon whose ownership is unique to them and them alone, wielding the element harnessed by an Etherious and passed down to them alongside the natural physical superiority of an Etherious in combat, utilizing offensive ability, stamina, and vitality, to transmogrify themselves into the greatest weapon of all, thus dramatically increasing the damage inflicted upon anything that they come into contact with using the sheer force of their strikes in all ranges – however, as one may have suspected, close-combat is where Devil Slayer Magic usually shines thanks to the physical might of an Etherious. The form of Elemental Magic that the wielder of Devil Slayer Magic commands, whether it be one of the classical elements, which are the rudimentary, simplest or essential parts/principles of which nature consists and were proposed to explain the nature and complexity of all matter in terms of simpler substances or something more abstract is theirs to command and at its absolute strongest when harnessed by a Devil Slayer.

As the the  of Devil Slayer Magic are known to be wielders of Curses (呪法, Jūhō), which are an alternate route of the arcane that  took with their incredible power routed in negative emotions as a contrast to the positive emotions fuelling ordinary Magic, it would obviously make sense that the grimoires that teach a hopeful wielder of Devil Slayer Magic the ancient art would possess properties similar to curses – every invocation of the activation sequence of the caster's Devil Slayer Magic is accompanied by the opposite of the 'magic = feelings' concept, with the wielder inadvertently their magic with negative feelings, causing their element being manifested to take on traits that aren't too wholesome. Thus, Devil Slayer Magic could be considered an anomaly in that it is an existence that's between a form of Magic and a Curse, allowing it to be labeled a contradiction made manifest as a supernatural power. Devil Slayer Magic draws upon the user's negative emotions in order to bolster its own power and manifest their negativity in a physical form as to empower their natural element, in that way, Devil Slayer Magic could be considered a Devil Slayer Curse (滅悪呪法, Metsuaku Jūhō); as a side note, originally, there wasn't much revealed about Devil Slayer Magic, as its had ties to, a  which was filled to the brim with demons, causing it to be categorized as a Curse in the first place until the reveal of the man's kinda-sorta humanity. Indeed, just like Curses, Devil Slayer Magic seems to involuntarily hold an origin in negative emotions that are displayed by all sorts of beings across, but mainly associated with the Seven Deadly Sins, a grouping and classification of vices that embody hubristic pride, greed, lust, malicious envy, gluttony, inordinate anger, and sloth, each sin embodying abuses or excessive versions of one's natural faculties or passions. No matter how many people would display positive emotions, negativity would always be there in a greater quantity – Devil Slayer Magic is no different. As their negative emotions increase, the element produced by a user of Devil Slayer Magic will increase in intensity and mass, as well as this, its properties will become more and more otherworldly, as the elemental begins to display elemental aspects atypical of their style such as burning, freezing, shocking, etc. Because of this, in the hands of a particularly vengeful Devil Slayer, Devil Slayer Magic can be considered almost apocalyptic in nature when compared to other forms of Slayer Magic.

Please note that Devil Slayer Magic and the arcane skill known as Demon Slayer Magic are effectively interchangeable in that both slay demonkind, but they possess drastically different mechanics and obtainment methods – for example, Devil Slayer Magic is learnt through the study of demonic tomes; by contrast, Demon Slayer Magic was taught by demons themselves to slay their own kind; for a simpler explanation and to save oneself from a wall of text, Devil Slayer Magic is more associated with and artificiality, whereas Demon Slayer Magic is representative of  and nature in that the magic was hewn by those whom were cursed to become demons or were born demons naturally without being created by an outside source such as a  with their unnatural power over life and death, specifically that of Living Magic. Interestingly, because the two forms of Slayer Magic were forged from the stone known as "to slay demons", this means that something unlike anything else in the history of Slayer Magic, and a process that's guaranteed to be incapable of being replicated, is able to be put into motion – in a manner that's not dissimilar to how Dual Element Dragon Slayer Magic and a incorporate another form of Dragon Slayer Magic into the wielder's body as to grant them the ability to harness two elements at once, a Devil Slayer Magic is capable of being combined with a Demon Slayer Magic either through a  teaching the magician the Demon Slayer Magic and then the magician learning Devil Slayer Magic from the, causing both activation sequences as well as their respective alterations made within the caster's Magic Origin to undergo the process of fusion, combining Demon Slayer Magic and Devil Slayer Magic in a fashion that resembles mutation. However, this doesn't create a brand-new form of Slayer Magic geared towards killing the demonic, but rather, since Devil Slayer Magic is known to have more power than Demon Slayer Magic, the Devil Slayer Magic absorbs the boons granted to the user by Demon Slayer Magic and removes any drawbacks while additionally using the processes of Demon Slayer Magic to eliminate any taboos and downsides in their Devil Slayer Magic, resulting in their Devil Slayer Magic becoming the apex of evolution for demon slaying, a power beyond all but the strongest forms of Slayer Magic.

Indeed, as one may have guessed from the name of this Slayer Magic, the purpose of Devil Slayer Magic is to slay the existence referred to as demons, which are a race of supernatural, often malevolent beings that can be loosely categorized as "doesn't fit in other races but definitely isn't human, also horn dealies". Thus, the wielder of Devil Slayer Magic has their attack and defensive power massively boosted against everything that can be considered to belong to demonkind, ranging from to  that were created by  – indeed, the term "demon" is open to a vast amount of interpretation, and thus Devil Slayer Magic could be considered a rare gem in that it can be categorized as an extremely rare and powerful type of subcategory of magic known as a Semantic-Type (意味型, Imi-gata), meaning that it is a supernatural power that can be defined solely by the caster's interpretation of what it governs over, all depending on their wording rather than anything logical—because of this, Devil Slayer Magic can theoretically affect anything that constitutes a "demon", allowing for a great deal of stretching of what it is capable of. In that manner, Devil Slayer Magic could be considered a power akin to that of Memory-Make or Arc of Embodiment, in all three heavily rely on the caster's imagination in order to bring out its full potential- while the former two are simply confined to using the power of creation to forge objects and attacks from the magician's thoughts to do battle, Devil Slayer Magic is only limited by the creativity of the caster, as mentioned before, anything that can be referred to as a "demon" causes their maneuvers to power up; indeed, this simple concept can be applied to a near countless multitude of unconventional uses as to almost give a Devil Slayer a distinct advantage in any situation. Simply by observing what's considered a "demon", a user of Devil Slayer Magic is capable of analyzing the demon's existence with their Magic Origin acting as a virus scanner of sorts, downloading information about their strengths and weaknesses as to obtain all necessary information that they can utilize to slay the foe before them with utmost proficiency.

Indeed, Devil Slayer Magic has virtually unlimited customization options in regards to the element formed through simple magical manipulation and reinforced through the power of an Etherious – the colour of the element is able to be altered freely, its properties which aren't limited to but include temperature, the smell that it emits, its taste, and overall "feel" is capable of being modified to the user's liking for countless different effects and powers, more often than not being attuned to the user's own personality and ambitions; the type of damage that the element inflicts upon anything that it comes into contact with is able to be changed at will such as changing from inflicting "blunt" damage that feels like being hit with a sledgehammer to a stream that freezes anything in its path through inducing a minor form of phase transition as to grant it corporality and switch back. Of course, as the highest form of elemental manipulation around, a wielder of Devil Slayer Magic is capable of harnessing their magic in any manner that they deem to be suitable, commonly changing between offensive, defensive, evasive, or supplementary potencies in accordance to the situation at hand; but generally, as long as the Devil Slayer is able to imagine their element being used in a particular manner and it doesn't break the laws of physics or conflict with any established limitations, then the sky is the limit, more or less. However, if a Devil Slayer makes the mistake of learning their element and the mechanics of the magic too quickly so that their body wouldn't be able to adapt to the abrupt changes in their physiology, Devil Slayer Magic reveals itself to be a very fickle magic, resulting in its taboo being put into effect – dark, tainted lines slowly, but surely creep up their body; as black as the night sky without a moon to provide some semblance of comfort to this everlasting darkness, these patterns spread across their entire frame as their very existence becomes corroded through a spider-web pattern of black veins, causing them to appear alien and repulsive in contrast to their original form. Interestingly, this form can be compared to Drive or Dragon Force in that the wielder of Devil Slayer Magic seems to receive a boost in power all across the board as it not only grants them a relatively limited degree of immunity to the effects of Curses, which are said to be impossible for an ordinary magician to fend off unless under very specific circumstances, extending from the relatively simple as utilized by  of the, which grants the demon the ability to use their arms as swords, to the impossibly powerful , which is supposed to completely annihilate whatever it touches in a similar manner to , a weapon of mass destruction once held by the. After some time working with their magic and improving their skill in Devil Slayer Magic to the point of achieving mastery over it, a Devil Slayer is capable of summoning these markings instantly in accordance to their will, similar to how can invoke Drive and Dragon Force simultaneously and through mental commands, except Devil Slayer's powered-up state isn't sucky.

Trivia

 * While the Fairy Tail Fanon's article on Devil Slayer Magic was written by the author (from what's recalled), this description of the magic was created exclusively for the author's various characters and to go more in-depth with the vanilla one; as such, there's no Fairy Tail Wiki Content template at the top.