Sagus

 Nefas (犯罪, Latin for "Sinful Act''") is a name referring to beings who, through varying methods, inherited the blood of Velia Agostinha Vivax, gaining peculiar supernatural abilities. Axenus Gate, a founder of Diluculum Sanctus, was the first to inherit this power, which later spread to the rest of the cult. As Agostinha has supposedly lost interest in the race, Nefas have become significantly scarce following the disappearance of Diluculum Sanctus; all remaining Nefas excluding Kaya Hike are believed to have obtained their power through a genetic relation to members of the fallen cult.''

​Overview
Nefas are strongly tied to Diluculum Sanctus, although it is unknown exactly when the race was created. Presumably, Agostinha originally lent Her powers to Axenus and created the Nefas with the initial intention of propagating awareness of Her existence. Agostinha would later grant the same powers to the rest of Her believers, although whether this happened before or after (as a result of) Diluculum Sanctus' formation is unclear. Given their abilities, it is likely that Nefas inherited specifically Agostinha's Mother (Mater) aspect of power, for the most part.

Long deprived of their former purpose, modern Nefas are largely independent, but few who are still aware of Agostinha openly worship Her. Due to their disorganization and scarcity, harmonious interactions between Nefas are very rare; in fact, generally, Nefas are highly distrustful of other Nefas, particularly those who still worship Agostinha. This distrust between the two factions has often resulted in holy wars.

Because incomplete Nefas powers can easily mimic those of Fullbringers or Quincy if used in an appropriate manner, many Nefas are unaware of the true nature of their abilities and incorrectly identify themselves as either of the aforementioned races. It is frequently implied by Kaya to be possible for a Nefas to change an individual into another Nefas through some form of ritual, but she has yet to elaborate upon this claim.

Although it is possible for offspring of a Nefas parent or a carrier of the Nefas gene to become an awakened Nefas, this is not guranteed—it is not uncommon for the Nefas gene to remain dormant in a particular bloodline for thousands of years before another Nefas is born within the family; carriers of the gene not born a Nefas are very unlikely to ever become a Nefas in their lifetime. A Nefas artificially created via a Sacrificium Cultri cannot produce Nefas offspring as they do not possess the gene.

Physical Traits
Nefas are very similar to regular humans in terms of appearance except for their eyes, which emit a faint unnatural glow. Some Nefas, such as Kaya, develop extraordinarily colored irises, but this is rather uncommon; in rarest cases, Nefas develop eyes asthetically similar to that of Agostinha's. When utilizing Anima Obscuritas, a Nefas' eyes become exceptionally darker and lose their radiance.

Subspecies

 * Nefas Falsus (不全の犯罪, Latin for "False Sinful Act"): A human without an awakened Nefas gene who has artificially gained pseudo-Nefas powers via a Sacrificium Cultri stab. Nefas Falsus cannot regulate their Pactum Anima without stabbing themselves with the aforementioned weapon nor can they obtain Anima Obscuritas.
 * Nefas Inferior (低い犯罪, Latin for "Lower Sinful Act"): A Nefas incapable of using Anima Obscuritas. This term applies to Nefas genetically incapable of learning Anima Obscuritas as well as Nefas who might acquire said power through appropriate training; it may also apply to Nefas Caela under identical conditions.
 * Nefas Verax (犯罪の正しい, Latin for "Truthful Sinful Act"): A "standard" Nefas with access to the typical Pactum Anima and Anima Obscuritas techniques. Formerly the most common type of Nefas.
 * ​Nefas Rubus (犯罪の赤い, Latin for "Red Sinful Act"): A Nefas Verax who possesses an uncanny compatibility with Agostinha's power, causing them to gain some of Her exclusive abilities, such as Vox Calamitosus. Nefas Rubus cannot awaken their full potential without being extensively subjected to Agostinha's influence, that is, remaining in close proximity to Her physical form for an extended period of time. This is the only type of Nefas capable of converting another individual into a Nefas. Kaya is said to be the only Nefas of this type, hence its naming.
 * Nefas Caela (犯罪の天, Latin for "Sinful Act of Heaven"): Nefa Caela is, in layman's terms, a Nefas with transcendental Pactum Anima. Unlike any other Nefas species, Nefas Caela are guaranteed to possess the power of every Donum element; what most distinguishes Nefas Caela, however, is that they are capable of using raw Pactum Anima as a weapon—the heaven element, or Elementum Caelum. This enables them to use additional types of sorcery, such as barriers and healing magic; additionally, they are capable of mapping Pactum Anima sequences to a personalized incantation, essentially creating their own spells. Nefas Caela are regarded as the sorcerers of the Nefas race, and, as such, they are also known as Veneficus (魔導師, Latin for "Sorcerer"). Nefas Caela can advance Pactum Anima abilities at a much faster rate than other Nefas but have very little expertise with Anima Obscuritas. No amount of training with Pactum Anima can change a regular Nefas into an Nefas Caela.
 * Nefas Gehennae (犯罪の地獄, Latin for "Sinful Act of Hell"): Nefas Gehennae possess transcendental Anima Obscuritas power, contrasting the Nefas Caela. A Nefas Gehennae's primary weapon is a variation of Proditio Dei that enables them to convert fragments of their own soul to form the technique without using Perplexus Esse as a medium, thus maintaining its stability indefinitely and allowing it to be more liberally used. Nefas Gehennae are exceptional with Anima Obscuritas but cannot advance their Pactum Anima abilities beyond rudimentary levels; they cannot obtain a Donum Verax. Although it is not fully understood why, Nefas Gehennae possess highly volatile power and tend to be emotionally unstable. This is the rarest type of Nefas sans the Nefas Rubus and Peccatum Grandis; no amount of training with Anima Obscuritas can change a regular Nefas into an Nefas Gehennae.
 * Nefas Corrupi (犯罪の不潔, Latin for "Corrupted Sinful Act"): A physical or spiritual being who possesses Nefas powers alongside a separate supernatural power—a hybrid Nefas. Because normally only physical beings can survive the soul conversion required for Pactum Anima, spiritual Nefas Corrupi, such as a Shinigami with Nefas powers, can only exist under extraordinary conditions. Rather than simply existing separately from a host's core power, Nefas powers are, for better or worse, completely assimilated into it; in other words, the host's primary power is drastically changed according to the principles of Nefas power and serves as its conduit, meaning that Nefas Corrupi usually cannot use traditional Nefas abilities with the consistent exception of Vinculum Inconstans. Because Nefas powers are based on the soul, every Nefas Corrupi possesses unique abilities. It is possible for a regular Nefas to become a Nefas Corrupi via use of Messor Vita on a divergent supernatural race. Corrupi are generally disliked by Agostinha's worshipers as they are considered impure.
 * Nefas ​Caela Corrupi (不潔の犯罪の天, Latin for "Corrupted Sinful Act of Heaven"): A Nefas Corrupi more inclined to Pactum Anima-based abilities, or who possesses some abilities similar to that of pure Nefas Caela.
 * Nefas Gehennae Corrupi  (不潔の犯罪の地獄, Latin for " Corrupted Sinful Act of Hell "): A Nefas Corrupi more inclined to Anima Obscuritas-based abilities, or who possesses some abilities similar to that of pure Nefas Gehennae. Unlike pure Nefas Gehennae, Nefas Gehennae Corrupi do not naturally develop emotional instability.
 * Peccatum Grandis (罪広大, Latin for "Grand Sin"): An astronomically powerful super Nefas. Peccatum Grandis are believed to have been among the very first humans to inherit Agostinha's blood during the birth of Diluculum Sanctus, surpassing the inherent master Nefas born from the pact. While it is unknown if this power extended to only the founders of the aforementioned cult, Peccatum Grandis are believed to no longer exist; it is generally believed to be impossible for any other Nefas to "ascend" and become a Peccatum Grandis, but this is unconfirmed. Relatively little is known regarding the abilities of Peccatum Grandis; it is, however, known that the Diluculum Sanctus' founders were often thought of as demigods even among master-level Nefas Verax. Peccatum Grandis may have been capable of using the abilities of both Nefas Caela and Nefas Gehennae.

Related Races

 * Anima Casus (魂の死, Latin for "Fallen Soul"): A wandering soul fragment of a Nefas who either died or failed to properly maintain their Pactum Anima and subsequently lost their physical body and former identity.

Core Abilities
What separates Nefas from other beings capable of manipulating any form of energy is that they did not use Reiryoku as a primary means of performing their sorcery: by transmuting and turning their very soul into a projectile weapon through one of two methods to create an undying link between them and their energy, Nefas are capable of performing feats that would otherwise be considered naturally impossible. Anima (魂, Latin for "Soul") refers to both energies. The first and most recognized form of energy is created by absorbing spiritrons into the soul, enlarging it and transmuting it into an projectable essence distributed throughout the physical body. This is known as Pactum Anima (魂の契約, Latin for "Soul Contract"). The time required for a Nefas to switch energies is at most three seconds; a master Nefas is capable of switching between the two instantaneously, making it seem as though they are using both energies at once.

Pactum Anima is superior to Reiryoku in that it never truly leaves the user's body; Pactum Anima immediately returns to its origin when it is no longer in use, a trait which gives Nefas a natural advantage in drawn-out or attritional battles. The process of creating Pactum Anima is dangerous in that if a Nefas generates more Pactum Anima than they are capable of sustaining, it can potentially cause their entire soul to fragmentize and consequently destroy their physical body, leaving them with an empty existence until their soul naturally withers away—in other words, turning them into an Anima Casus. Pactum Anima does require a completely physical vessel, so any Shinigami-Nefas hybrid, for example, attempting to create Pactum Anima would meet with a similar fate—while it is technically possible for a spiritual being to obtain Nefas powers, such a being cannot safely generate Anima and therefore cannot use primary Nefas abilities. It is speculated that hybrid Shinigami can possibly utilize Pactum Anima via a Gigai, but this would effectively prevent the Shinigami from leaving their Gigai ever again.

Because Pactum Anima is never permanently expended from the body, a Nefas only needs to perform the conversion process once, after which it can never be reversed; however, they may do so again at a later time if they believe that they are capable of maintaining greater amounts of Pactum Anima, generally attained through frequent meditation. Pactum Anima is eternally part of a Nefas and cannot be absorbed, manipulated, or destroyed by an outside influence, so techniques generated by Pactum Anima cannot directly harm or be turned against the original user through any method; in addition, it renders them immune to possession and abilities that directly target the soul. Although Nefas generally have very little Reiatsu if any at all, they seem to be unaffected when subjected to much higher volumes of Reiatsu emitted from other individuals; it is possible that Nefas are incapable of sensing Reiatsu at all.

The second energy, Anima Obscuritas (闇の魂, Latin for "Darkness Soul"), is more abstract in nature; a common basic description is that while Pactum Anima empowers the soul, Anima Obscuritas destroys the soul with the power of Vis Cassus. Anima Obscuritas does not involve submitting the soul to darkness as one might believe—Anima Obscuritas can be utilized when a Nefas drastically compresses their Pactum Anima to the point that they lose much of their personality and their body virtually becomes an empty vessel while still retaining their consciousness; this paradox enables the user to manipulate outside influences via projection of this empty energy, most commonly an opponent's soul. The more Pactum Anima the user has, the more difficult it is to correctly perform this procedure. Because formerly Anima Obscuritas supposedly required absolute devotion to Agostinha to generate without dying in the process, only a few modern Nefas have access to it. Nefas are generally immune to Anima Obscuritas if it is used directly against them (i.e. Manus Tenax), provided they have greater Pactum Anima than the user of Anima Obscuritas. The Vis Cassus of Anima Obscuritas does not require a living target to be aware of the user before the target can be affected. Similar to Pactum Anima, Anima Obscuritas is impossible to turn against the user. Anima Obscuritas demands concentration to maintain; it is therefore possible for a Nefas to get "knocked out" of an Anima Obscuritas state after sustaining a sufficient injury.

Because of their high flexibility, Nefas techniques are generally applied very differently for every Nefas. Note that the following list of techniques does not include personal variations—only standard techniques and variations that most Nefas have access to.

Pactum Anima Techniques
Volatus (飛行, Latin for "Flight"): The most basic Pactum Anima technique, Volatus is, as its name suggests, a lofty movement technique; it also serves as a high-speed movement technique. To perform Volatus, a Nefas first expels exactly half of their Pactum Anima and cycles it radially around their body; next, the user partially dissociates themselves with the released Pactum Anima while linking it to their internal Pactum Anima, turning the external Pactum Anima into a lever of sorts. The internal Pactum Anima's link with the free-flowing, external Pactum Anima converts the physical body into a similar lofty state, allowing the user to move freely in the air as well as enhancing their movement speed. The user's speed is proportionate to the amount of Pactum Anima released as well as said energy's rotational speed, which can be modified at any time; faster speeds require greater amounts of concentration. Regressing the Pactum Anima's rotational speed to minimal levels and spontaneously inflating it in the same instant results in a brief but gargantuan boost of movement speed identical to more familiar high-speed movement techniques such as Shunpo. Volatus grants Nefas somewhat of an advantage during aerial combat as it enables them to navigate through the air with far greater flexibility than wingless individuals; another advantage is that, because Volatus is not physical bodily movement, a user can instantaneously stop or change direction without worrying about traction. Volatus can be maintained during the Anima Obscuritas state by only compressing internal Pactum Anima—it cannot be initiated during said state. Nefas Caela can utilize Volatus offensively through certain methods.

Donum (贈り物, Latin for "Gift"): Because Pactum Anima is literally a Nefas' soul, its generalized capabilities are largely different for each individual. Donum refers to special abilities based on a Nefas' soul. Most commonly, Donum grants a Nefas one or more elemental attributes, which seems to be based on the individual's personality; however, certain individuals, such as Axenus, developed a far more intricate Donum, Donum Verax (真の贈り物, Latin for "Truthful Gift") in addition to a basic elemental Donum. Nefas are directly immune to elemental reishi-based abilities corresponding to any elemental Donum they possess; this is due to their ability to assimilate any spiritual matter that overly resembles an aspect of their soul. It is possible for both types of Donum to evolve as a Nefas' personality does. Donum is commonly compared to the powers granted to Shinigami by their Zanpakutō, except that the power of Donum is not materialized as a weapon. Donum cannot normally be used during an Anima Obscuritas state—it is replaced with Donum Obscurus.

Turris Anima (タワー魂, Latin for "Soul Tower"): An ability that exploits Pactum Anima's link with its user and temporarily strengthens them. To perform this techinique, a Nefas must first expel a massive amount of Pactum Anima, usually via a Donum techinique or sometimes using Pilum Nexus, the latter of which requiring that a Nefas remain in Anima Obscuritas until Turris Anima has worn off. Taking advantage of resulting space for additional Pactum Anima, a Nefas once again performs the conversion process before the energy returns to their body, manually restoring their Pactum Anima. Once this is complete, a Nefas manipulates the burst of sudden energy and converts their expended Pactum Anima into an additional layer of Pactum Anima that coats a Nefas' primary Pactum Anima reservoir. This consequently strengthens the Nefas by an equivalent amount to the energy that they released. While exceedingly powerful, Turris Anima's procedure is dangerous in that if a Nefas fails to correctly layer the released Pactum Anima, it will completely merge with them as usual and destroy their physical body due to the over-accumulation of Pactum Anima. Turris Anima is much easier to perform while utilizing Anima Obscuritas; as such, ancient Nefas commonly switched to Anima Obscuritas before starting the layering process. As a side effect, Turris Anima heals minor injuries every time it is executed.

Simulacrum Pacta (画像の誓約, Latin for "Embodiment of the Contract"): A Nefas' primary means of enhancing their capabilities, Simulacrum Pacta is somewhat similar to Turris Anima execpt that it is more direct and can be perfomed at any time, but requires extensive focus. To perform Simulacrum Pacta, a Nefas evenly divides their Pactum Anima throughout their body, creating as many separate channels of energy as desired. The Nefas must recognize every individual reservoir of Pactum Anima as that of a separate, yet like-minded entity, before once again uniting their Pactum Anima. Because of the Nefas' disassociation with their Pactum Anima, the unity is treated as a fusion of identical souls; this consequently results in the Nefas, in a sense, merging with their entire being, doubling every aspect of their capabilities for each division of Pactum Anima the Nefas created. Simulacrum Pacta surrounds the Nefas in a black aura when used to a major extent. Because of its properties, Sacrilacri Pactum's greatest weakness is the accelerated strain and aging resulting from the identical fusion; the exact severity of this strain and rapid aging appears to correspond to the Nefas' mutiplied power (e.g. enhancing one's capabilities to one-hundred times their normal level would result in a Nefas aging one-hundred times faster than normal). Multiplying one's capabilities by at least one-hundred times is considered master-level. A Nefas can, however, drastically reduce the strain on their body by only enhancing a few capabilities in particular, such as reflexes or physical strength. Although immortal Nefas such as Kaya may freely utilize Simulacri Pacum without any long-term ill-effects, an excessive or prolonged fusion could still severely damage an untrained physical body. Simulacrum Pacta division is a trained skill—the more adept the Nefas, the more they can divide their Pactum Anima. Regular use of Messor Vita is a necessity for continued use of Simulacrum Pacta, and, as a result, it was largely overlooked by Diluculum Sanctus. Simulacrum Pacta is generally unsuited for use during battle because of its long preparation time in the hands of an inexperienced Nefas, which only increases the more a Nefas divides their Pactum Anima; only a true master is capable of instantly invoking Simulacrum Pacta to an extent. While Simulacrum Pacta cannot be initiated during the Anima Obscuritas state, switching to Anima Obscuritas will not interrupt the technique if it is activated beforehand.

Corpus Ubique Praesens (どこにでも存在する体, Latin for "Omnipresent Body"): A secondary "high-speed movement" technique utilized by both modern and ancient Nefas, Corpus Ubique Praesens is, in truth, a highly versatile technique that far transcends any other form of movement. Corpus Ubique Praesens is literally instantaneous teleportation, intended to silently warp a Nefas to a location of their choosing with no effect on their surroundings; however, when used to its fullest, Corpus Ubique Praesens can warp a Nefas to any dimension or location—even if they have never seen said location before. This is possible because Corpus Ubique Praesens does not rely on the Nefas' knowledge alone as a vector; during Corpus Ubique Praesens, a Nefas becomes omniscient, meaning that it is possible to teleport to a designated location as long as the user is aware of said location; this applies identically to living targets. Because Corpus Ubique Praesens occurs in a single instant, a Nefas relocates themselves according to their own will prior to executing it—there is no active selection process. Because of its basic properties, Corpus Ubique Praesens can be used to escape any sort of trap, and, as a result of its ability to teleport the user to the location of any living target they are aware of, functions as a perfect tracking tool against hidden opponents. Upon successfully executing Corpus Ubique Praesens, a Nefas immediately loses any knowledge that they had obtained from the technique. What further separates Corpus Ubique Praesens from other teleportation techniques in that it can be used offensively due to the fact it is also capable of accurately warping objects and even other individuals. Because Corpus Ubique Praesens is not normally an Anima Obscuritas technique, a Nefas can only warp other individuals according to the individual's will; however, if the individual is physically touching the Nefas, they can be relocated according to the Nefas' will, which presumably involves establishing a connection between two parallel souls. During Anima Obscuritas, Corpus Ubique Praesens works similarly to Manus Tenax—living targets can be warped from a distance completely disregarding their will; inanimate objects, by extension, can be relocated in mass even if the user is not touching them. The difficulty of warping distant objects with the Anima Obscuritas variation of Corpus Ubique Praesens is determined by exactly the same variables as Manus Tenax. Corpus Ubique Praesens is especially powerful when utilized offensively by a master, capable of warping opponents away from any object they might be touching, such as a weapon or even their own clothes. An especially proficient Corpus Ubique Praesens user can warp objects directly into an opponent's body with enough precision, or even cannibalize their body at an atomic level. While there is said to be no limit to how far a user may warp using Corpus Ubique Praesens, most Nefas cannot warp farther than several yards or traverse dimensions; Axenus Gate, however, was said to be capable of warping an equivalent distance to the sun from the earth (1 au, or roughly 92,620,000 miles). Corpus Ubique Praesens can potentially trigger amnesia if it is used excessively, which seems to pertain to its meddling with the user's knowledge. Corpus Ubique Praesens' method of improvement is rather unclear given the technique's highly abstract nature, although Nefas with higher capacity for Pactum Anima tend to have slightly higher rates of improvement than those with lesser capacity. A user is considered a master of the technique once they are capable of traversing dimensions.

Vinculum Inconstans (接続の儚い, Latin for "Fickle Link"): A purely supplemental technique, Vinculum Inconstans creates a highly intimate bond between two consensual Nefas through means of literally linking their souls together and allowing both partners to essentially share physical bodies. To perform Vinculum Inconstans, a Nefas must first be in physical contact with a Nefas partner; both Nefas must then exchange Pactum Anima in willingly allowing half of their partner's Pactum Anima to flow within them while subsequently entrusting half of their own Pactum Anima. Both users dissociate themselves with their relinquished Pactum Anima while accepting their partner's energy as a part of them, thus forming the basic spiritual link; to finalize the connection, both users form a link between their own internal Pactum Anima and the Pactum Anima gifted to their partner, consequently forming a finite but absolute fusion of mind and spirit. When complete, Vinculum Inconstans enables Nefas to fight with one mind through two physical bodies, allowing them to instantaneously coordinate complex strategies without the need for communication of any sort. Resulting from the profound link, Vinculum Inconstans has an additional benefit as well—if either partner switches to Anima Obscuritas during the link, both partners will be capable of using Pactum Anima and Anima Obscuritas at the same time, allowing for lethal combinations of both types of abilities. While Vinculum Inconstans is not meant to improve physical capabilities nor Pactum Anima abilities, it drastically enhances Anima Obscuritas abilities as the influence of both partners is effectively linked as well. The sensation of “merging” with a partner is often described as difficult to explain or understand—while a user retains their singular consciousness, it is only capable of moving between their own or their partner's physical body, observing a conflict while sharing their partner's thoughts and emotions; it is said to be as if a stronger, more obscure bonding exists between them and their partner that cannot be directly controlled, manipulating their bodies according to the shared will between both partners. Despite Vinculum Inconstans' benefits, it is exceedingly dangerous and potentially fatal to link with a Nefas with very powerful emotions; if a user has a strong hatred of any sort, for example, their partner must have the will to embrace this hatred while retaining their own individuality for the technique's duration, or else that hatred as well as pertinent aspects of the user's personality will permanently be fused into them upon ending the technique. In extreme cases, a user's mind can be so heavily affected by their partner's emotions that they lose virtually all of their individuality within the link, converting the user's soul into a single Anima Casus and forcibly ending the technique. It is not uncommon for linked users to experience a brief identity disorder upon breaking the link. Pain and death is also shared between linked partners, but a user can spare themselves a partner's demise through timely cancellation of the technique. Due to its highly intimate nature, Vinculum Inconstans was generally used by lovers as means of expressing their affection for one another; its usefulness in combat has only recently been considered, and, as a result, the technique is mostly foreign to Nefas outside of Diluculum Aeternus. Vinculum Inconstans has additional uses outside of combat; for example, one can briefly form a link with a consensual partner solely to gain a full understanding of them and acquire all of their knowledge. Vinculum Inconstans technically cannot be used to link with more than one individual since Pactum Anima gifted to a partner must equal the user's remaining internal Pactum Anima, which in turn must be half of the relinquished Pactum Anima; additionally, Vinculum Inconstans cannot be used to link with an entity that is already an extension of, or born from, the user's soul, examples including Donum Obscurus summons, Perplexus Esse creations, and, in the case of Nefas-Shinigami hybrids, Zanpakutō Spirits. If a user's soul has previously been corrupted by a particular partner's intense emotions during Vinculum Inconstans, it may be impossible for the two individuals to ever form a link together again. To initiate a consensual Vinculum Inconstans link using Anima Obscuritas, both partners must be in the Anima Obscuritas state and substitute Pactum Anima for Vis Cassus; while this sort of link is substantially more difficult to perform, it is advantageous in that it is generally faster and does not require any physical contact. During the Anima Obscuritas state, it is possible to briefly form a one-sided link with any individual that is not a Nefas against their will through Manus Tenax, but this has little use besides amassing the target's knowledge.

Anima Obscuritas Techniques
Donum Obscurus (ギフト暗い, Latin for "Dark Gift"): As with Pactum Anima, Anima Obscuritas is unique for each Nefas. Donum Obscurus, unlike Pactum Anima's Donum, refers to a personification based on a Nefas' soul of this technique, as well as the actual technique. Unlike general Anima Obscuritas application, a Nefas influences an unknown realm, enabling them to summon black apparitions, the appearances of which are based on the user's soul. Mythical creatures are among the most common forms these entities assume. The greatest strength of Donum Obscurus summons is their unique set of abilities dependent on a more subtle aspect of a user's personality, meaning that their abilities are entirely separate from the user's Donum Verax. Their level of power appears to be based on their summoner's will, among other uncertain variables; an average summon is roughly at the level of an average Shinigami captain, according to past estimates. It is unknown if there is a limit to how many dark entities the user may summon at a time; ancient Anima Obscuritas users generally did not summon more than several at once, but it is possible that it is based on a Nefas' proficiency with Anima Obscuritas. As with the regular Donum, Donum Obscuritas evolves in accordance to any behavioral changes in a Nefas.

Manus Tenax (粘り強い手, Latin for "Clinging Hand"): The most basic and versatile application of Anima Obscuritas, Manus Tenax is the ability to influence both inanimate objects and living beings without changing their properties—it is somewhat similar to archetypal telekinesis but differs in other ways besides execution. While Manus Tenax technically refers to an influential hold over a target, it is also used to refer to general influence, which is always active during the Anima Obscuritas state. Manus Tenax's method of execution differs according to whatever the user is trying to influence—inanimate objects can be instantly manipulated according to a Nefas' will, but the time required to influence a living being is dependent on the target's mass compared to the user's mass and the target's movement, as well as the Nefas' expertise with Manus Tenax; Reiatsu is not taken into account. Although dependent on Manus Tenax's range and, by extension, a Nefas' experience, time variations due to differences in mass are usually insignificant as a very large difference would be required for any noticable changes in timing. Most Nefas cannot affect continuously moving targets with Manus Tenax if the target is not simply walking, but a significant skill level can drastically remedy this weakness. Because anything caught with Manus Tenax is paralyzed and powerless for the technique's duration, a victim cannot normally escape on their own. Once an opponent has been caught, a Nefas can devastate them with one of Manus Tenax's follow-ups, telekinetically manipulate them as they please, or simply rip them apart. As with most Anima techiques, Manus Tenax requires constant focus; as a result, even a mild distraction is usually enough to thwart an inexperienced Nefas. While Manus Tenax can be used to manipulate an infinite number of inanimate objects as long as they are within range, the number of living beings that can be manipulated at once depends on a Nefas' level of concentration. A Nefas can completely resist an opposing Manus Tenax should they have greater Pactum Anima than its user; regardless, it is considerably more difficult to capture a Nefas with this technique. Like many Nefas abilities, there is no limit to how proficient one might become with Manus Tenax—an absolutely perfect Manus Tenax would always be instantaneous, completely disregarding the four variables. An instantaneous Manus Tenax hold is referred to as Manus Tenax Grandis (盛大粘り強い手, Latin for "Grand Clinging Hand"). A user is considered a master of Manus Tenax once they have achieved a Manus Tenax Grandis range—no matter how small—concerning targets of equivalent mass to the user, with a greater range indicating a higher level of mastery.
 * Messor Vita (人生の収穫, Latin for "Life Reaper"): A follow-up of Manus Tenax that may only be used on living beings, Messor Vita dissolves the opponent's body by instantly draining them of their life force and transferring it to the user. Because Messor Vita, in a sense, involves merging with the opponent's soul, a Nefas may inherit a small fraction of their power as a side effect; the chances of this happening depends on the Nefas' "compatibility" with the target's soul, as claimed by Axenus. In most extreme cases, a Nefas can inherit the abilities of other races. If used regularly, Messor Vita can halt biological aging indefinitely and consequently render Simulacrum Pacta's drawback moot; however, because any liberal Simulacrum Pacta user would almost certainly need to rely on human beings to maintain their lifespan, Diluculum Sanctus is said to have banned usage of this technique to discourage excessive use of Simulacrum Pacta. While Messor Vita does work against beings who are truly immortal, it is technically incapable of killing them; therefore, the user would inherit their immortality.
 * Proditio Dei (神の裏切り, Latin for "God's Betrayal"): One of the most genocidal abilities in a Nefas' arsenal, surpassed only by Pilum Nexus and, in extreme cases, Perplexus Esse. To initiate this technique, a Nefas first uses Messor Vita to draw out the opponent's "life force" as usual; however, rather than absorb the life force directly, a Nefas divides the energy to cradle it in each hand before merging it with their influential power, synthesizing an unfathomably chaotic energy. Proditio Dei manifests as a black miasma emitting from the user's arms but can be manipulated at will—fired over extreme distances. What renders the energy of Proditio Dei so dangerous is that even being near it can produce fatal results for any individual other the user, including another Nefas; Proditio Dei itself acts as a transcendent, gluttonous variation of Manus Tenax, absorbing the souls of every individual nearby to fuel its own strength. Should an individual be just out of Proditio Dei's most effective range, it will instead gradually absorb aspects of their individuality, ranging from power to personality. Should energy produced by Proditio Dei exist for too long, it will eventually evolve to comsume any form of atomic component and finally, similar to Pilum Agostinha, space-time itself, causing cataclysmic damage; at this point, even the user's survival is not guranteed. At an intermediate point of Proditio Dei's development, its user is effectively impervious to any form of attack as long as they remain within the energy's influence; it is important for the user to remain in the air during this period, occasionally dispersing the energy to allow the passage of oxygen if necessary. Because a Nefas can only direct Proditio Dei's energy and not its influence, Proditio Dei is completely impractical for use during cooperate efforts. Because Proditio Dei's initial effective range is largely dependent on the number of souls a Nefas uses to activate the technique, it is most apt for a Nefas to only utilize the technique when a massive number of souls have been collected so as to maintain stability. Proditio Dei is normally cancelled when the user directly absorbs the energy before it turns against them, which, depending on when this is performed, has a benefit of granting a massive boost to a Nefas' Pactum Anima, provided their body is capable of maintaining it; it may destroy them otherwise, which is why it is suicidal to cancel the technique via said method with full Pactum Anima capacity. Alternatively, a user can layer Proditio Dei's energy around their compressed soul a la Turris Anima, granting them potentially unimaginable power and enabling them to use Pactum Anima and Anima Obscuritas simultaneously for its duration. Proditio Dei is not cancelled should its user be killed, meaning the energy would continue to expand and eventually endanger all of existence; in such a case, the only way to stop the energy would be for a number of Nefas proportionate to the energy's level of expansion to absorb it entirely in a joint effort, which may require sacrifice.
 * Manus Conterere (手を破壊する, Latin for "Crushing Hand"): A follow-up of Manus Tenax that simply crushes the opponent's body entirely. What separates Manus Conterere from simply mutilating the opponent with its progenitor is that a Nefas may inherit a significant amount of knowledge from any living target killed with this technique; similar to Messor Vita, this supposedly depends on compatibility between the Nefas and the target's souls.
 * Poena Sententiae (罰の宣告, Latin for "Penalty of Conviction"): A follow-up of Manus Tenax that imposes a Nefas' influence within the target and subjugates their soul. Once successfully executed, Poena Sententiae is impossible to naturally reverse by anyone other than the user; it can be said that the Nefas covets the target's sovereignty, paralleling the effects of Messor Vita and Manus Conterere. Poena Sententiae does not always work—true to its name, Poena Sententiae is ironically much easier to perform on strong-willed individuals; regardless, Poena Sententiae cannot be used to subjugate another Nefas. Diluculum Sanctus is known to have banned usage of this technique; as a result, relatively little is known about it. Manus Tenax's hold on the target is completely lost should Poena Sententiae fail.
 * Exhalatio (呼気, Latin for "Exhalation"): An instantaneous, albeit linear version of Manus Tenax. Exhalatio can only be performed upon physical contact with a desired target, which drastically reduces the time required to influence the target and consequently enables an exploit—by rapidly imposing their soul's influence upon a target and instantly nullifying it just before the target is completely subjugated, a Nefas can violently repel the target in question from the source of the influence. Exhalatio's potency is dependent on the opponent's own momentum and the user's timing—the more "influenced" the target is prior to cancelling Manus Tenax, the farther they will be pushed back, with incorrect timing simply resulting in a complete Manus Tenax. Exhalatio is pointless to use against opponents too slow to avoid Manus Tenax at close range, yet an excellent alternative otherwise. Exhalatio is technically impossible to use if the target is within any Manus Tenax Grandis range; it is possible to use Exhalatio from a distance in such a case, however. A master of Manus Tenax, should they be unable to dodge, is capable of using this technique to deflect physical assaults, usually resulting in minimal or no damage. While usually not fatal, Exhalatio can, in fact, rip a target's body apart with proper timing and enough momentum.

Perplexus Esse (ジレンマである, Latin for "Enigmatic Existence"): A simpler, though not necessarily inferior version of Donum Obscurus—while Donum Obscurus influences an entire realm, Perplexus Esse is primarily used to influence inanimate objects in such a way where a Nefas shares their sentience and soul with an object, giving it true life and subsequently changing its appearance. The exact form the entity will assume as well as its abilities differ according to the catalyst, the history of the catalyst, and the user's persona and level of Pactum Anima; one example of this is shown when Kaya uses a one-thousand year-old oak tree as a catalyst, transforming it into an enormous treant of sorts, capable of rotting individuals bound by its roots. As discovered by Kaya, if a Nefas applies Perplexus Esse to a weapon that they themselves crafted, it is possible to create a sentient weapon very similar to a Zanpakutō or Fullbring, with abilities dependent on the weapon's former usage, and how and why it was created. Perplexus Esse is quite similar to necromancy when used on corpses, capable of "reviving" a deceased individual while retaining all of their power and abilities, discarding only their original personality—while entities created with this technique are capable of acting on their own and sometimes even speaking, their personality is largely taken from the user's. A master of Perplexus Esse is capable of using any object as a catalyst to conjure horrific visitants no matter how insignificant it is; an example would be a speck of dirt. Similar to Corpus Ubique Praesens, a Nefas can easily use the opponent's own clothes against them should they remain stationary for too long. When used by a Nefas perfectly in control of their emotions, it is possible to partially control the resulting form of any catalyst. Although there is no limit to Perplexus Esse's duration (an entity only disappears when they are either "killed" or manually dismissed by the user) as well as how many "thralls" one may create using it, it is very difficult for most Nefas to maintain a large number of entities. When an entity is killed by anyone other than its master, an experienced user can immediately use the soul gifted to the entity to fuel Proditio Dei. The variables for the technique's preparation time are mostly the same as Manus Tenax—experience, mass, movement and distance.

Votum Fatum (願いの宿命, Latin for "Fate Prayer"): The Anima Obscuritas variation of Vinculum Inconstans.

Pilum Nexus (尊敬結合, Latin for "Binding Javelin"): The only ability in a Nefas' arsenal that Agostinha is known to possess, rather than simply being an inferior variant of one of Her abilities.

Standard Equipment

 * Sacrificium Cultri: Sacrificium_Cultri.pngThe Sacrificium Cultri (犠の剃刀, Latin for "Razor's Sacrifice") was among the primary weapons for the Nefas of Diluculum Sanctus. Conceived by one of the unknown founders, the Sacrificium Cultri is synthesized with the energy of Proditio Dei and, though Perplexus Esse, the power of regular Anima Obscuritas; its purpose is to forcefully convert the soul of a living being into Pactum Anima, destroying the target's physical body and turning them into Anima Casus. When such a target is stabbed (not simply cut) by the razor, its influential energy enables it to merge the energy of Proditio Dei into the target's soul; because Proditio Dei's energy is born from collected souls and essentially becomes abnormal Pactum Anima upon absorption, the target's soul is naturally converted into a similar energy. The Sacrificium Cultri is meant to be used to destroy the souls of spiritual beings and may have unfavorable effects on anything else; Nefas themselves, for example, could benefit from being stabbed by the razor should they have further capacity for Pactum Anima. Any physical being—animals included—may survive the soul conversion and thus become a Nefas Falsus. Because of the power of Perplexus Esse, the razor is practically immune to damage; even should it sustain any form of damage, it is capable of reforming itself almost instantaneously, which explains why it still exists in abundance. The Sacrificium Cultri is entirely self-sufficient and can thus be wielded by any individual. Although the razor is no longer produced, it is often possessed by descendants of Diluculum Sanctus' Nefas as a family heirloom.
 * Pacta Baiulus:

Trivia

 * All images used in this article were drawn by the author.
 * Nefas are the result of a number of ideas taken from the author's original, unfinished works.
 * It must be noted that although Agostinha was responsible for the creation of the Nefas, they possess some techniques that Agostinha is incapable of using, such as Simulacrum Pacta.
 * According to Agostinha, without Her intervention, Nefas do not reincarnate when they die, instead becoming Anima Casus. This is either a result of the fact that they were born from Agostinha, who transcends the cycle of existence and thus cannot die and reincarnate, or the nature of Pactum Anima.
 * Nefas powers are notoriously difficult to train, to the extent that even Kaya claims to have not fully mastered her abilities despite her old age and brilliance; it can be assumed that fully mastering Nefas powers, so to speak, would take well over five-thousand years on average.