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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 Earth Land.
Just like how Dragon Slayer Magic is harnessed by those referred to as Dragon Slayers, Devil Slayer Magic is utilized by those known as Devil Slayers (滅悪魔導士, Debiru Sureiyā lit. Demon Destroying Magicians) or Exorcist Mages (悪魔祓いの魔導士, Akumaharai no Madōshi).
In order to learn Devil Slayer Magic in the first place, the hopeful wielder must have their magic "modified" by one of the Black Magic-attuned grimoire, examples of which include the Books of Zeref as created by the Black Wizard in the main timeline, and the Tome of Amadam penned and developed by Black Magister Amadam in the Sun Trilogy timeline, which contain notes on how to obtain Magical Barrier Particles as to produce a Devil Slayer, very similar to that of a Dragon teaching a human Dragon Slayer Magic to transform them into a Dragon Slayer. The black grimoire 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 artificial demon 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 God Slayer obtains their God Slayer Magic 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 black grimoire 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 Etherious. 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 Etherious, 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.
A Devil Slayer's ice prevailing over the flames of a Dragon Slayer.
As the ones hewn from the obtainment method of Devil Slayer Magic are known to be wielders of Curses (呪法, Jūhō), which are an alternate route of the arcane that the so-called strongest Etherious 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 demonic power; as a side note, originally, there wasn't much revealed about Devil Slayer Magic, as its very first publicly known user had ties to Tartaros, a Dark Guild 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 Earth Land, 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 slays all demons; Devil Slayer Magic is capable of being learnt through the study of demonic tomes; by contrast it can also be taught 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 capable of annihilating both Etherious and artificiality as well as demons 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 Dark-aligned magician with their unnatural power over life and death, specifically that of Living 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 natural demons to artificial demons that were created by the Black Wizard – 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 Ice Devil Slayer Magic 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. Additionally, as demonstrated in Bloodman's clash with the Black Steel, during the war between the Alvarez Empire and Fiore, demons are more than capable of wielding the power of Devil Slayer Magic; this makes Devil Slayer Magic extremely unique amongst the regular Slayer Magics, as it can take the form of an ordinary Caster Magic or a Curse. The reason for this is relatively simple - just like Dragon Slayer Magic is harnessed by dragons as proof of their power, Devil Slayer Magic is no different. When re-purposing Devil Slayer Magic to be utilized by a Curse, the demon replaces certain key steps in the activation sequence with the demon's own supernatural equivalent and modifying some aspects of said process in order to synchronize said power better with their own abilities, by removing "eternano" from the equation entirely while replacing "Curse Power" with "Magic Origin" while the natural physiology of a demon serves as a Magic Origin. Projecting their Curse Power outwards while mentally commanding it to awaken, a demon is capable of manifesting Devil Slayer Magic in its modified form - the Devil Slayer Curse (滅悪呪法, Metsuaku Jūhō) which now carries the effects of normal curses, being inherently more powerful than the bog-standard magic, as the Devil Slayer power is lethal for human magicians due to their composition of Magical Barrier Particles.
Common Subspecies Abilities
Alter: Fiendflux (滅悪禁内魔導・神通力源変換, Oruta: Fīendofurakkusu lit. Devil Slayer's Forbidden Internalized Magic Art: Supernatural Power Source Conversion): Alter: Fiendflux is an exceedingly rare and overwhelmingly powerful subspecies ability for Devil Slayer Magic; to put it as simple as possible, Alter: Fiendflux allows a wielder of Devil Slayer Magic to shift the properties of their element in order to take upon characteristics of other demonic powers such as Curses and the Black Arts and from there, utilize techniques and spells from said powers. Indeed, Alter: Fiendflux could be considered Devil Slayer Magic's equivalent to the likes of Dragon Slayer Magic's Illegal Change: Multiscale and Spirit Slayer Magic's Switch: Spiritmorph in that it broadens the methods in which the wielder of Devil Slayer Magic is able to attack, but at the same time, Alter: Fiendflux couldn't be any more different than the two other subspecies abilities. Because the method of activation can effectively be referred to as a Combination Spell, which is, well, a combination between two magics, not dissimilar to that of a Unison Raid; however, it is notably somewhat weaker than a Unison Raid thanks to the user being the only magician who unleashes the spell. In any case, when invoking the power of Alter: Fiendflux, the wielder of Devil Slayer Magic utilizes the concept of symbolism and places a large emphasis upon scientific methods in regards to how the power that kills demonkind is handled as a contrast to the "pure will and design" that regular usage of magic runs off of, Alter: Fiendflux incorporates alchemic theory, which is a philosophical and protoscientific tradition that aimed to purify, mature, and perfect certain objects into its mechanics, in order to function properly, Alter: Fiendflux requires the Devil Slayer to have a high level of skill in and use a transmutation-type magic (preferably Enchantment upon their element while exploring the scope and limitations of what their element is capable of achieving, not only turning to alternative forms of fiction, but searching for any meanings their element would have in different beliefs in order to transmogrify the core aspect of their power to an extent that fantasy undergoes the shift to reality; this ability can only be used by a Devil Slayer whose physiology is similar to an organic adapter, a device that converts attributes of one electrical device or system to those of an otherwise incompatible device or system, but instead of allowing the Devil Slayer's body to bond more easily with Lacrima when implanted within themselves in the vein of the strongest of the Four Gods of Ishgar, God Serena, the shifting of elements allows their Magic Origin to properly adjust to the switch in properties of power. Indeed, the user goes by the known information that more often than not, any 'alternative' form of supernatural power other than Magic is more or less just magic, but casted with a different source of terms. Through the power of Alter: Fiendflux while visualizing the supernatural energies which compose the powers which those known as fighters throw around on the battlefield, the user is capable of analyzing a supernaturally-borne technique's particle composition as well as the muscle movement of the technique while the attack is in the process of being unleashed, which enables them to learn everything about the opposing power, right down to its mechanics, limitations, and its main function, quantifying the supernatural energies that they perceive as data in a similar manner to that of Archive. At this point, the wielder of the Devil Slayer Magic, after their mind and fighting style's power has bunched together all forms of supernatural powers – whether they be Magic, Curse, and more – as one in order to treat all powers at a single type, thereby quantifying them down to the simplest form. As Magic is the power of the caster's spirit which can be said to be their magical power and Magic Origin synchronizing with the spiritual flow of nature, also known as ambient eternano in the atmosphere, and Curses are the power of the caster's spirit synchronizing with their inner darkness, Alter: Fiendflux affects both magic and curses by breaking down their composition and information into otherworldly data, while transmogrifying the activation sequences of different power sources into the wielder's own form of energy manipulation. Thus, by replacing certain key steps in the activation sequence with the user's own supernatural equivalent and modifying some aspects of said process in order to synchronize said power better with their own abilities, a wielder of Devil Slayer Magic is capable of flawlessly replicating and utilizing an ability that would normally be exclusive to a different supernatural fighting style that's associated with their element. A good example of doing so is a Devil Slayer invoking the activation sequence of their fire-element Devil Slayer Magic while harnessing Alter: Fiendflux in order to wield the Bomb Curse, which a Curse that well, involves explosions.
Common Spells
A wielder of Devil Slayer Magic activating Surge.
Surge (人工悪呪力演, Sāji lit. Manmade Devil Curse Power Amplification): Surge is an uncategorized Devil Slayer Magic spell that's an Magic-amplification technique and equivalent to Dragon Slayer Magic's Drive; Surge brings out the true power of their capabilities as a user of Devil Slayer Magic, excluding the power boost granted by Devil Force, yet, at the same time, seemingly enhancing the user's physical prowess to a degree, particularly the user's speed. The Surge spell, unlike its draconic equivalent, Drive, which is exclusive to Third-Generation Dragon Slayers, is known to be capable of being harnessed by any user of Devil Slayer Magic as long as they possess the power necessary to induce its effects and the knowledge of how to do so. In any case, when invoking the power of Surge, the Devil Slayer focuses intently, while drawing upon the demonic energies that have been infused within their body by the black grimoire that they've procured their particular form of Devil Slayer Magic from, causing an uprise in Magical Barrier Particles which quickly begin to take form within their Magic Origin. As Magical Barrier Particles can be considered to be the negative electric charge to the magical energy's positive electric charge, exact counterparts to one another, the magical energies emptying themselves from the wielder's magic origin in a hurry - this results in an acceleration of the output and flow of magic within the user's body alongside the Magical Barrier Particles reinforcing their very existence but otherwise not displaying any traits typical of the demonic particle; overall, this causes a massive enhancement in the caster's forte all across the board, pushing the wielder of Devil Slayer Magic beyond their normal state by approximately five times their ordinary power than normal, increasing the strength, speed, and potential that the user possesses tenfold, allowing them to take on even foes much more powerful than themselves; entering a state of enhanced awareness and peak physical ability as their element cloaks around them. While in this state, the user demonstrates heightened reflexes and extremely quick information processing, and it amplifies the powers of their Devil Slayer Magic without exhausting themselves. This state grants the user the ability to perform new spells; as well as making their pre-existing spells far more powerful, with various users only employing several skills only while in Burst, allowing the user to dish out some serious damage. However, because of how dangerous this ability is as Magical Barrier Particles and ordinary magical energies can be considered anti-matter and ordinary matter respectively, their collision quite possibly being able to annihilate the wielder of Devil Slayer Magic, Surge is only capable of being harnessed for five minutes at a time, otherwise the amount of risks the caster takes while it is invoked is increased sevenfold and has the potential to kill them in a freak accident.
Revenger (滅悪力・圧封呪Ribenjā lit. Devil Slayer Power: Pressure Seal Spell): Revenger is a powerful uncategorized Devil Slayer Magic spell which has a noticeable amount of synergy with all forms of Devil Slayer Magic – Revenger involves the wielder of Devil Slayer Magic taking revenge upon the opponent by using processes not dissimilar to a member of the Black Arts and Curses in order to force them into a state of helplessness – the opponent cannot move; they are unable to attack; and they cannot even free themselves from this inescapable bind. In any case, when performing Revenger, the wielder of Devil Slayer Magic focuses intently, while drawing upon the demonic energies that have been infused within their body by the black grimoire that they've procured their particular form of Devil Slayer Magic from, and from here, instead of proceeding to invoke the activation sequence of their Devil Slayer Magic, the Devil Slayer uses the demonic properties of their magic in order to fuel their power with negative emotions while manifesting the particles which destroy the arcane outwards in front of them, adding their personal element into these particles by now inducing the activation sequence and using the Curse-like properties of Devil Slayer Magic to ensure that the Magical Barrier Particles will not immediately annihilate their element. At this point, the wielder of Devil Slayer Magic invokes a process not dissimilar to the likes of Shape Transformation and Molding Magic, specifically a form of Molding Magic that's associated with their own element in order to alter the shape and mass of these demonic particles, oftentimes gathering and condensing these dual-energies upon their hands or any other body part—perhaps even a weapon of some sorts. Once this entire process has been completed, the wielder of Devil Slayer Magic launches the compressed heap of Magical Barrier Particles and elemental energies towards the opponent, these masses expanding as to surround the enemy in its entirety. In the blink of an eye, the Magical Barrier Particles and elemental energies transform into a pair of ethereal rings, the textures of which vary depend on the element of the wielder of Devil Slayer Magic, collapsing upon the adversary and oftentimes locking around their limbs. Possessing the exact same properties of the Magical Barrier Particles, feeding on the eternano in the atmosphere and contaminating it in order to fuel the unbreakable nature of the spell, forcibly inserting itself into the enemy magician's Magic Channels and Magic Origin by entering through the skin as any arcane forms of opposition are shut down, rendering ordinary Magic and spells useless. This locking power displayed by Revenger may be focused on a particular body part if the user wishes it to in order to maximize a single sealing, but the end result is always the same, in that the opponent cannot move; they are unable to attack; and they cannot even free themselves. When under the effects of Revenger, opposing spells already cast are rendered inert and useless but continue to remain within the mortal plane, thus continuously draining magical energy from the opponent's Magic Origin due to not fulfilling its purpose yet, something that they could negate with magical manipulation, but oftentimes since the magician is bound in place by Revenger, they're helpless to do a thing about it – additionally, even without the time limit, the enemy magician can only be freed from their locked state by a power that explicitly affects a locked magician. All that the target can do is just lose control of their bodily functions, at least until twenty seconds pass, upon where the opponent will be unlocked.
Magical Barrier Particles (魔障粒子 Mashōryūshi): The Magical Barrier Particles are known to be exceptionally poisonous particles that possess magic-disruption properties and are oftentimes utilized in the composition of arcane barriers. The Magical Barrier Particles are said to be an byproduct of the biology of demonkind, specifically that of the artificially-created Etherious, the demons forged through the Black Arts by exceptionally powerful Dark Magicians whom are capable of utilizing Living Magic. Thus, the Magical Barrier Particles can be considered to be artificial particles, using the Black Arts as a particle accelerator of sorts, their negative emotions acting as an electromagnetic field as the Black Arts propel the dark-tainted magical energies to incredible speeds, thus transmogrifying them into Magical Barrier Particles. The Magical Barrier Particles take the form of a thick black mist that possesses poisonous properties, causing a wide variety of disturbances in organisms when an organism absorbs a sufficient quantity. When released into the environment, the Magical Barrier Particles quickly spread outwards, feeding on the eternano within the atmosphere and contaminating it to corrupt them into demonic particles which ordinary magicians are incapable of being in close proximity, thus causing magicians whom breathe them in to suffer severe poisoning and weakening the strength, speed, and area-of-effect of their Magic while cutting the arcane output from their Magic Origin by more than half. Because of this, the Magical Barrier Particles are oftentimes referred to as "Anti-Eternano" and demonkind are more often than not unaffected by these poisonous particles due to wielding Curses instead of magic. The symptoms of being infected by Magical Barrier Particles are as follows; visually, the veins around the eyes of the victim puff up, with the victim themselves violently expectorating blood before, presumably, dying of contraction, all in mere moments; additionally, these toxic particles are able to enter the magician's skin over prolonged periods of time. Indeed, against opposing magic and spells, the Magical Barrier Particles sever the chemical bonds between eternano and the enemy's magical energy, thus terminating any activation sequences and allowing the Magical Barrier Particles to repel any type of magical attack and break through any magical defense, making them extremely dangerous to magicians. It's said that in a majority of cases, because of the Magical Barrier Particles, magicians will be forever incapable of laying a single hand upon demonkind, showing that the Magical Barrier Particles are extremely dangerous to those with magical aptitude, serving as an all-consuming poison that can turn the world of magic upside-down. However, wielders of Slayer Magic, due to the changes in their physiology granted by the bestowment process of their magic by the legendary creature that taught them their Slayer Magic, have special lungs that are known to possess a far greater resistance against the Magical Barrier Particles than a majority of other magician in case of inhalation. That aside, the particles also contain very trace amounts of iron along with the poison, thus enabling a wielder of a metal-element Slayer Magic such as Metal Phoenix Slayer Magic or Iron Dragon Slayer Magic to enter their strongest transformed state while completely restoring their health momentarily after consuming much of them, as well as not die or even fall unconscious for that matter afterwards. Such poison aside, arcane barriers like Jutsu Shiki barriers as well as Defenser and Barrier Magic are also comprised of what has been called Magical Barrier Particles, which are the same as, or at least of similar nature to, said poisonous particles, as the both of them were at one point shown being nullified together, whilst being not referred to distinctly. It should be taken into consideration that due to the fact that a Devil Slayer obtained their form of Devil Slayer Magic from the grimoires penned by dark magicians such as Black Wizard Zeref and his Books of Zeref or the Tome of Amadam penned and developed by Black Magister Amadam, grouped with the various physiological changes a wielder of Devil Slayer Magic undergoes is the creation of a separate portion within their Magic Origin which contains Magical Barrier Particles. A wielder of Devil Slayer Magic is able to draw these anti-magic particles out and them harness them like ordinary magic, merging their element with them in order to produce devastating results. However, they cannot be wielded alongside the caster's magic for prolonged periods of time due to Magical Barrier Particles interacting with magic inside a body producing near-lethal results.
Devil Force
A wielder of Devil Slayer Magic also having finished transforming into Devil Force.
Devil Force (悪の力, Debiru Fōsu lit. Devil's Power) is the most advanced state that an ordinary Devil Slayer is capable of taking upon - it can be seen as the equivalent to Dragon Slayer Magic's Dragon Force in that both are powered-up forms and essentially transform the wielder of the Slayer Magic into the creature their magic was created to kill in the first place. Interestingly, unlike Dragon Force, Devil Force is an existence born from the breaking of the magic's taboo - indeed, as mentioned above, 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 - normally a sign of corruption, a particularly powerful Devil Slayer is capable of harnessing the distinct markings in a positive manner by saturating the insides of their body and the outsides with an overdose of Magical Barrier Particles while flaring up the demonic energies dwelling within their body, causing their bodies to undergo a sudden mutation into a stronger form, energy leaking from their demonic aura which surrounds their entire body, causing a unique reaction which results in the Devil Slayer taking upon a new, more demonic form - this transformation is equivalent to an Etherious transforming into their Etherious Form (エーテリアス・フォーム, Ēteriasu Fōmu), which is a full release of their demonic powers. Commonly, while transforming, the Devil Slayer retains their general humanoid bodily structure while in Devil Force but with some additions; horns, claws, fangs and tail are common, as are wings, becoming larger and more muscular in regards to their body and their colour changes, but there are several kinds of transformations which are far less humanoid, varying from strange, surreal or even absolutely horrific. For practical reasons, the type of Devil Force can be divided into three groups defined by what they are formed from, Physical, Spiritual, and Etheral. A Physical Devil Force isn't necessarily solid matter, but the caster transforms into a being of pure elemental energy with a relatively defined and stable form; most users of Devil Slayer Magic that aren't originally of demonic stock have this variation. Note that demons of this group aren't necessarily any weaker than those of the other groups, they are simply more "solid" in mind and body. Spiritual Devil Force results in the Devil Slayer transforming into a completely spiritual being, and thus far less bound to the laws of physics or single form. Many of them think in ways that are only tangentially related to the thought process of mankind, and their forms are both transient and often downright surreal. An Ethereal Devil Force is said to be both the most powerful and ancient transformation, in some ways closer to sentient concepts than anything else. As such, relating to them in any way is likely impossible - this form is only available to reincarnated demons and Devil Slayers whom were demonic in the first place. While the three classes of Devil Force are said to be on different levels of power, a Physical Devil Force can defeat an Etheral Devil Force for example, showing that it all depends on the level of power within the original wielder's body and how they choose to use it.
As such, when Devil Force is engaged, the strength, speed, and demonic abilities of the Devil Slayer are dramatically enhanced, improving their combat capability significantly as their element is completely incorporated into their very existence in a manner that's not dissimilar to Elemental Body ability of Elemental Magic, which allows the user to let physical and magical attacks pass harmlessly through their body when they're transformed or simply absorb the attack. Additionally, through Magical Barrier Particles being manifested and infused within their body, each and every one of the caster's attacks becomes toxic for any ordinary magician as it is accompanied by a thick black mist, displaying the ability to damage the Eternano in the atmosphere and can cause both Magic deficiency and illness in a manner that resembles an electromagnetic pulse, specially in magicians. Of course, Devil Force greatly increases the damage done by standard Devil Slayer Magic attacks, and grants the user access to more advanced, powerful attacks while boosting their arcane power, prompting it to violently become visible, taking on the shape of a demonic visage; when used at the fullest, the generated silhouette seems to gain corporeality, likely as a result of the immense amount of demonic power employed; the caster also has the ability to manipulate the atomic structure of their physiology at will, allowing the Devil Slayer to form their limbs into weapons composed of their element more freely, regardless of it being part of their biological structure or not with a greater creation speed than Molding Magic. Devil Force also 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 Tenga Goken as utilized by Ezel of the Nine Demon Gates, which grants the demon the ability to use their arms as swords, to the impossibly powerful Memento Mori, which is supposed to completely annihilate whatever it touches in a similar manner to Satellite Square: Etherion, a weapon of mass destruction once held by the Magic Council. 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 two particular Third-Generation Dragon Slayers can invoke Drive and Dragon Force simultaneously and through mental commands, except Devil Slayer's powered-up state isn't sucky. However, as Devil Force continues to be used successively, the black markings would spread all across the Devil Slayer's body until they completely envelop their frame, resulting in their biological structure being permanently transformed as they become yet another Etherious through a process known as Devilification (悪化, Akuka), their magics being replaced by Curse equivalents as their Devil Force becomes their Etherious Form.
While the Fairy Tail Fanon's article on Devil Slayer Magicwas 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.
Devil Slayer Magic is the only Slayer Magic that's compatible with an alternative supernatural power system; for that matter, it's also one of two magics that are capable of being so overall.
