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The «Cardinal System» (カーディナル・システム, Kādinaru Shisutemu?), occasionally referred to simply as Cardinal, serves as the primary driving and management force of nearly all Virtual Reality MMOs in the Sword Art Online Universe. The system was originally developed by Kayaba Akihiko to manage all resources, processes, and events within Sword Art Online. A portable version of the Cardinal System was included in the World Seed to facilitate the easy management of new VR worlds.

In a few situations, Cardinal is given nearly absolute authority on all matters related to the game that it manages without requiring any human input, whether that be player monitoring, spawn balancing or generation of new quests. The only known game that has the highly advanced Cardinal System that SAO had, is «ALfheim Online» (ALO), but the higher functions of the Cardinal System were disabled, until the game was transferred over to its new management, Ymir.

Quest CreationEdit

Cardinal, or at least the highly advanced version built into SAO and ALO, had the authority to create and manage any number of quests. During the run of SAO, there were reportedly a number of strange and bizarre quests that kept appearing every so often. It was explained that Cardinal oftentimes creates quests based around internet trends, mythology and stories that it acquires from the Internet. The Cardinal running both SAO and ALO is also capable of creating quests with the ability to completely change the geography of the game itself, even for those not involved in a quest or event. This is shown when ALO's Cardinal System creates a quest, in which failure would have led to the destruction of the World Tree, and destroyed player-owned homes and items.

Gameplay ManagementEdit

In addition to creating quests, all versions of the Cardinal System have a balancing system, designed to keep players from exploiting certain aspects of the game. An example would be if a player found an area where monster's respawn rate was low, with high EXP gain, Cardinal would appropriately lower either of the parameters. Cardinal would also check for bugs in the system and attempt to fix them. As an artificial entity, Cardinal is even able to give shape to new AI programs and highly realistic characters such as Freyja and the hyper-intelligent Yui.

MonitoringEdit

The Cardinal System had a number of monitoring systems, designed to either detect bugs, or to keep track of the mental health of the players. Cardinal even has a sub-program that continuously checks the main process for errors and corrects them.

Emotional MonitoringEdit

Griselda&amp;#039;s ghost

Griselda's Emotional Imprint

The AI, «Yui-MHCP001» was created to monitor the mental states of SAO's players, as well as to attempt to remedy them. The original NerveGear had the ability to read the wavelengths of the brain, and to parse the data, in order to determine what sort of emotions and thoughts were felt. This allowed Yui to determine the emotional state of any player within the game. However, at the game's official release, the Cardinal System denied Yui permission to interact with the players due to orders from Kayaba Akihiko, thus forcing her to continue monitoring the emotions of players without being able to take any action to remedy them.

Additionally, when Cardinal detected an unusual or special brain pattern, it had the ability to imprint that data on the surrounding landscape, items, or even other players' avatars in raw format for analyzing. This essentially meant that a partial duplicate of one's state of mind was saved within SAO. An example of this is seen when Asuna and Kirito seem to witness the ghost of Griselda smiling at them. This was likely the imprint of Griselda's emotions, left on her wedding ring, and the landscape.

AlicizationEdit

Human form of Cardinal

The human avatar of the Cardinal System's sub-process that appears in Underworld.

Main article: Cardinal (Underworld)

In the Alicization arc, a version of the «Cardinal System» was revealed to have been employed in the creation of «Underworld». However, during the rise of the organization known as the Axiom Church, most of the administrative capabilities of the System were stolen by the Church's founder, Quinella, who accidentally burned the primary instruction of the Cardinal System into her Fluctlight. However, Quinella later developed a split personality from the sub-process of the Cardinal System that was in charge of correcting the errors of the main process and deemed that Quinella was committing a grave error with her methods of maintaining balance. This split personality eventually obtained a body of her own, but was forced to retreat to the Great Library Room that is within the Central Cathedral, but not spatially linked to it.

Quinella discovered new Sacred Arts that the other Underworld Residents had not known. By studying the meanings of the words used in the commands, she was able to form the first offensive command, the «Thermal Arrow» and with it, she discovered that killing any other living being, will increase the person's stats, so she sneaked out of home every night to hunt nearby animals and rose her stats at an incredible rate.

Vol 11 - 289

Quinella assuming control of all Underworld.

Taking advantage of her knowledge, Quinella made people believe that she was gifted by gods, and took the opportunity to start creating the Central Cathedral, and with it, the Axiom Church. She created the Feudal System in Underworld by making the lords into nobles and thus, creating a structure to control the entire Underworld. The restriction imposed by the Axiom Church on lowering the life stats of living beings was created by Quinella to prevent other humans from elevating their authority levels.

As Quinella's power grew, so did the tower in the Cathedral. From a certain point of time, she no longer showed herself to those of the world and immersed herself purely in the analysis of the Sacred Arts to transcend the ultimate limit set upon her, «Life». She became anxious because, despite all her power, her life continued to drop and there was nothing she could do about it, until one day, when she was on the brink of death, she managed to find a command that allowed her to see the list of all commands accessible in Underworld, at the bottom of which was one that raised her System Control Authority level to the maximum and granted herself the authorities that were reserved only for the Cardinal System, including terrain manipulation, item generation and even the manipulation of the durability of dynamic units, including humans.

Quinella immediately used her new powers to completely restore her own Life, halt its natural degeneration and recovered her former appearance from her years as a youth. However, Quinella was not yet satisfied. She could not permit the existence of one that had an authority level equal to hers - the Cardinal System. While recklessly trying to decipher the complex syntax of supervisor-level commands via a reference list created for Rath employees, she devised an extensive complicated command in hopes of stealing the powers of the Cardinal System. However, a single yet enormous error with reciting the command led to her burning the core principles of the Cardinal System onto her own Fluctlight.

Awakening only after an entire day of sleep after reciting the command, Quinella did not age, did not need to eat or drink, but she inherited a single desire from the Cardinal System - to regulate the world, but she went further than the Cardinal System in regulating the world. She desired to keep the Human Empire the same for eternity, but to achieve this goal, she needed to take control of the most unpredictable factor of the world - the residents.

Quinella took various actions to restrain the lives of the residents. Firstly, she proclaimed a single edict to split the Human Empire into four empires and made the four great nobles of the age into the emperors of the new empires. She then used her supervisor powers to instantly create the «Immortal Wall» that separated the empires, thus creating a physical barrier that restricted the movement of the residents. She also created various other barriers in the more remote regions of the Human Empire where pioneers had founded new villages. These included physical barriers such as the Gigas Cedar, and psychological barriers such as the «Bells of Time Telling», which could only be heard within a certain range within a town or village.

However, Quinella actually inherited two instructions from the Cardinal System. While the main process was in charge of regulating the world, a separate sub-process was in charge of performing error corrections on the main process. The main process was in control of Quinella's body for most of the time, however, whenever Quinella's consciousness slackened, the sub-process was able to float up to the surface of the thought process. The sub-process deemed the main process, Quinella, to be conducting a great error, as the Cardinal System was not supposed to directly affect humans. Therefore, she tried to cause Quinella's death multiple times, but failed due to Quinella reassuming control of her body.

Having realized that the sub-process has become a threat to her, Quinella sought for a way to keep it locked in within herself. Noticing that the sub-process could only take control of her body during times of emotional distress, Quinella decided to freeze her emotions to stay in control of her body at all times. By now, she had been abducting Underworld residents who questioned the Taboo Index and the Axiom Church and using these captives as test subjects for experimenting with Fluctlight altering commands called the «Synthesis Ritual». Through these inhumane experiments, she was able to test which part of the Fluctlight should be altered to change a person's memory, thought patterns, emotions etc. Having tested this ritual long enough, Quinella applied the ritual on herself and was successful in freezing most of the emotions that were the cause of her unrest: fear, anger, etc.

Approaching 150 years of age, Quinella noticed an anomaly within herself. Various incidents, from briefly losing her consciousness even outside of sleep to not being able to recall recent memories and even having trouble recalling the Sacred Art commands that she should have memorized perfectly, had been happening recurrently to her. Upon examining her own Fluctlight, Quinella was shocked to find out that the memory capacity of her Fluctlight had reached its limit without her knowledge. Because of this newfound limit on her existence which could not be controlled like Life, Quinella sought for a way to overcome it. So, she devised a devious scheme for overcoming the memory limit on her Fluctlight by hijacking the Fluctlight of another person who had plenty of memory capacity to spare and using the said victim's Fluctlight to store a backup of her compressed memories, before manipulating her own memories to free up more space on her own Fluctlight.

At the time, a 10-year old nun had been studying Sacred Arts on the lower levels of the Central Cathedral due to her above average System Control Authority. Quinella selected this nun to be the vessel for her backup memories, so she invited the nun to the top floor of the Cathedral. There, Quinella successfully overwrote the nun's Fluctlight with Quinella's own thought processes and memories. However, an unforeseen issue arose. After the Synthesis Ritual, which was used to copy Quinella's soul onto the nun's Fluctlight, was completed and the two females awoke at the same time, they came to the realization that they were identical beings, which caused both of their Fluctlights to start breaking down due to the shock caused by the realization.

However, the nun's Fluctlight was the first to break down, allowing Cardinal, the sub-process which was transferred to the nun's body in the process of the ritual, to take control of the nun's body. At that point, they recognized each other as the Administrator within Quinella's original body and the Cardinal's sub-process within the girl's body and this allowed their Fluctlights to stop breaking down.

Vol 12 - 037

Quinella's battle against Cardinal.

At that moment, Cardinal seized the initiative and used high-level Sacred Arts against Quinella. The first attack landed magnificently at its target and a magnificent death match of immense lightning and whirlwinds, infernos and ice daggers unfolded. As both Quinella's and Cardinal's paces were exactly the same, Cardinal was winning the battle due to being the one who attacked first. As the battle was coming to its end, Quinella realized a decisive difference between her and Cardinal. She immediately chanted a command to turn one of the high-priority objects within the room into a weapon and then a command that prevented use of system commands within the room. Although Cardinal managed to generate a staff with the same priority as Quinella's sword, Cardinal was put at a disadvantage due to controlling a body that differed in size from the body she used to be contained in before. After two or three blows, Cardinal had to fall back. Quinella gave chase, however, Cardinal chanted the art that allowed her to retreat into the Great Library Room and lock the doors afterwards. As unlocking the door from the outside required a tedious ritual, Quinella was distracted long enough for Cardinal to finish chanting a command that destroyed the door just as it was unlocked.

Afterwards, Quinella had to resort to deleting her most recent peripheral memories to ensure she had at least a minimum of free memory capacity and began spending most of the day lying in bed with her eyes shut to minimize the amount of new memories recorded. Quinella also ensured guaranteed protection for herself by using the Synthesis Ritual on her former test subjects, people arrested for breaking the Taboo Index and, later, the winners of the Four Empires Unity Tournament, turning them into absolutely loyal Integrity Knights. From then on, having delegated most of her duties to her subordinates, Quinella would only rise from her bed at scheduled times to check on the management of the world.

With the era of the Cold War and, later, the collapse of the Soviet Union, people have been becoming less and less tolerant of the death of soldiers, while countries with large militaries, especially America, have been unable to give up their army munitions industry. With such conditions, the need for unmanned weapons to fight in wars instead of humans has arisen. However, as no countries export weapons to Japan, Japan's defense technology has become too weak and, eventually, Japan had to buy new equipment from America. Although, formally, America is supposed to work together with Japan on developing new technology, but in reality, Japan has only been given outdated equipment. Thus, the need for Japan to develop its own technology came.[1] Project Alicization, a top-secret government project run by Rath, a company affiliated with the Japan Self Defense Force (JSDF), was started to create the first highly adaptive, «Bottom-up AI». By using a 4th generation FullDive machine, called the Soul Translator (STL), Rath succeeded in copying the Fluctlights (souls) of twelve newborn babies, creating a «Soul Archetype», a non-developed Artificial Fluctlight that could be copied to create new Artificial Fluctlights, which would then need to be nurtured to mature into an individual. For this reason, a virtual world, codenamed «Underworld», was created using the free kernel version of the Cardinal System, The Seed, and then transferred into the STL mainframe via the Mnemonic Visuals feature of the STL.

Underworld is set in a past era, when science and philosophy were just being discovered, but instead of recreating a past era, limited terrain and certain customs were introduced so that the inhabitants of the world would form their own society.

MythologyEdit

GodsEdit

The people of Underworld recognize at least 5 gods:

The Goddess of Creation Stacia (創世の神ステイシア, Sōsei no Kami Suteishia?) - the main goddess of the Human Empire, as well as the goddess of life and creation. According to the legends, she governs the existence of all animate and inanimate objects in the form of Life, displayed in the Stacia Window, and summons those whose Life expires to her side.[2] Marriages in the Human Empire are pledged to Stacia, who blesses the couple and allows them to have children.[3]

The Sun Goddess Solus (陽神ソルス, Hi Shin Sorusu?, derived from Latin "Sol" - "Sun") - the goddess of Underworld's star, Solus, that provides blessings to the world in the form of sunrays that increase the surrounding Sacred Power. Her blessings diminish during the night when the Solus sets.

The Land Goddess Terraria (地神テラリア, Chijin Teraria?, derived from Latin "Terra" - Earth) - the goddess of the earth that provides blessings to plants and protects metalworkers and craftsmen. Provides Sacred Power through the earth, though this source of power is very limited in cities and above the ground.

The Darkness God Vector (闇神ベクタ, Yami Shin Bekuta?) - the ruler of the Dark Territory and the only god worshipped there. Vector is said to love pulling pranks on humans, in the form of diseases or kidnapping people and taking away their memory. Vector also provides Sacred Power necessary for casting Dark Arts.

The Goddess of the Moon Lunaria (月の神ルナリア, Tsuki no Kami Runaria?, derived from Latin "Luna" - moon) - the goddess of the moon who controls the dreams of Underworld's residents.[4]

World CreationEdit

According to the story told by the Axiom Church, the world was created by the 3 goddesses, Stacia, Solus and Terraria,[5] but was then split by Stacia and Vector into the Human Empire, overseen by Stacia, and the Dark Territory, ruled by Vector,[3] after Solus drove away Vector to the land of darkness with her holy spiritual light during the world's creation.[5] Ever since that time, the light of Solus has never shone on the lands of the Dark Territory.[6]

The Great WarEdit

In one legend, it is said that once every one thousand years, when the light of Solus weakens, the forces of darkness led by the dark knights would cross the mountain range will invade the Human Empire from the North Cave, West Gorge, South Corridor and East Gate. In that great war, the guards in the villages, the sentinels from all towns and the imperial army would form the Human Empire Army that would be led by the Integrity Knights to fight against the hordes of monsters, while nobles would support the Integrity Knights as the commanders of that army. Until then, the nobles are to polish their swordsmanship in preparation for the battle.[6][7]

The TruthEdit

In reality, the existence of the four gods was forged by the Axiom Church to secure its authority over the Human Empire. Although none of the gods truly exist in the world, they are registered as super accounts in the system, though they had never been used since the creation of Underworld.[3][8]

HistoryEdit

The Original FourEdit

The population of the Human Empire began around 70 Before HEC with two families of eight Artificial Fluctlights each in a small village at the center of the Human Empire, the village of Centoria. Both of these families had two real Rath employees nurturing them, while the rest of the villagers were simulated with placeholder NPCs. The four members of Rath raised the first sixteen Artificial Fluctlights to adulthood, teaching them everything from reading and writing to cultivation of crops and rearing of livestock to the morality of good and evil, however, one of the four employees lacked ethics and unintentionally corrupted one or two of the children by passing down his egoism and desire for wealth and dominance to them. After the Artificial Fluctlights reached the age of 18 and started families of their own, the four humans logged out one after another by simulating an "epidemic".

The Growth of the WorldEdit

After the «original four» logged out, the population of Underworld continued to grow, with the humans marrying when they were about 20 years old and bearing an average of 5 children, thus the 5th generation already consisted of 600 children, with about 400 still alive from the older generations. The children corrupted by the egoistic Rath employee became the ancestors of the future nobles as they secured their place as elites in the world. By the time of the 5th generation, the inhabitants of the Human Empire were already ruled by several lords, who, inheriting the egoism from their ancestors, earnestly continued expanding the land they owned, thus depriving the descendants of the non-corrupted first humans of land for cultivation. Most of the youth was then forced to work for the lords as tenant farmers, while some of them, who were not content with their social positions, set off from Centoria and traveled to the remote regions where they founded new towns and villages, like Zakkaria and Rulid Village, and thus acquired new land to cultivate.

Meanwhile, the lords that ruled over the capital held enmity towards each other, so there was a long period of time without any marriages between them. However, after some time, a political marriage happened between two families of lords for the first time. As a result of this marriage, a single daughter, possessing a higher level of egoism than any other lord in the world at the time, was born.

Axiom ChurchEdit

The Axiom Church was founded around 30HEC (100 years after the creation of Underworld). At the time, the founder and head of the church was a girl named Quinella. Her Sacred Task was one not seen before in Underworld: "Sacred Arts Research". She soon became very proficient at the Sacred Arts and had discovered many new rituals that people could use in every day life. At the age of thirteen, Quinella decided she didn't want to rule over the people as a lord or baron - she wanted to have absolute control, she wanted to become God. To do this, Quinella started doing "miracles" in front of people, predicting storms and healing sick and injured people in the name of "god". She told the people that a shrine to worship god needed to be built in order to perform even greater miracles, hence a large marble spire was erected in the center of town. This was the beginning of the Axiom Church.

Years later when Quinella felt her life was coming to an end, she desperately tried to find a form of Sacred Arts that could manipulate her «Life». Even at the verge of death, she still tried chanting various combinations of verses in the hopes of finding something that could help her. One fateful night, when she was just on the brink of death, Quinella discovered the Sacred Art: “Inspect Entire Command list”, and at the bottom of this list was the command that Quinella had been searching for, the one that would let her truly become God. This command that she had found was one that took the administrator powers from Cardinal and transferred them to Quinella, allowing her to then use all the controls that administrators had access to, including the manipulation of «Life». Even after this act, Quinella's thirst for power was not satisfied and so she tried to eliminate the one thing that held equal authority to her, the Cardinal System, but accidentally ended up infusing it with her Fluclight. By doing this, she became less human and adopted the primary purpose of the Cardinal System: to preserve the Human Empire exactly as it was.

Quinella then created the Immortal Walls in Centoria which divided the Human Empire into four. This was to create a physical barrier between the people and to make sure that the Axiom Church would have complete control of the relaying of information. She made it so that the people would remain reliant on the church and thus they would stay devoted to its preachings. Large physical barriers including: a huge, unbreakable rock; a swamp that could never be filled; a rapid, uncrossable stream and a gigantic, unfellable tree were then put in the world to make sure that humanity could not expand past its current boundaries, effectively stopping all progress in the Human Empire. She also set down rules for the people, including the Taboo Index, and made sure every resident knew them so that no one could possibly oppose her. While this was all happening, the tower of Axiom Church was growing ever higher.

Seventy years after Quinella assumed her position as administrator, she discovered that the capacity in her brain for storing memories was reaching its limit. In an attempt to stop this, Quinella attempted to transfer her memories into a young girl. However, this backfired as a Fluctlight could not bear the fact that there was an exact copy of it. But, instead of both of Quinella's Fluctlights breaking down, the young girl's Fluctlight collapsed a moment sooner and allowed the Cardinal System's error correction program to take control of her body, creating Cardinal. As both Cardinal and Quinella now deemed each other as different beings, their Fluctlight breakdown halted. Cardinal reacted a mere moment sooner and attacked Quinella first. However, Cardinal was eventually overpowered and forced to flee and seek refuge inside the Great Library Room. Afterwards, Quinella started avoiding death by deleting her most recent memories and spending most of her day sleeping on the top floor of the church to avoid filling up her memory capacity. She also started using the Synthesis Ritual on especially strong swordsmen and law breakers to turn them into Integrity Knights, who would fight the monsters of the Dark Territory, keep order among the people and defend her from Cardinal, whom she knew would be back one day to kill her. Cardinal would also try to seek help from humans in her quest to kill Quinella, but every time she found someone that might be able to help, Quinella was able to get to that person first.

Through the Integrity Knights, the Church was able to maintain its rule over the Human Empire for another 200 years. However, the Church's rule became endangered when the «Load Test Stage» began to approach. Even with the great fighting prowess of Integrity Knights they would eventually be overpowered by the sheer numbers of the Dark Territory's forces, even if Quinella herself would join the battle. Knowing this would one day happen, the Axiom Church invented a story that on a day when the light of Solus would weaken, the forces of the Dark Territory would invade the Human Empire. Quinella used this story as a pretext for the foundation of the Sword Mastery Academy.[citation needed]

GeographyEdit

Human EmpireEdit

The Human Empire (ヒューマン・エンパイア人界, Jinkai/Hyuman Empaia?) is where the humans live in the Underworld. It's a perfect circle with a diameter that measures around 1500 kilometers. The Human Empire is bordered by the Mountain Range at the Edge and connects to the «Dark Territory» via the «North Cave», «East Gate», «South Corridor» and «West Gorge».

The Human Empire is divided into four empires: Norlangarth North Empire, Eastabarieth Empire, Wesdarath Empire, and Southacroith Empire. The capital of all four empires is is their respective side of Centoria, from which the Human Empire is ruled by the Axiom Church and the four empires. Each empire is separated by the large «Immortal wall» (不朽の壁, Fukyū no Kabe?), which extends from the 4 corners of the Axiom Church and stretches to the Mountain Range at the Edge, thus limiting movement between the empires. An identification handprint is required to cross the Immortal Wall.

About 80,000 people live within the Human Empire, about 20,000 of which live within Centoria. The 4 empires together have about 2,000 soldiers.

Norlangarth North EmpireEdit

The Norlangarth North Empire

Expand slideshow1 of 2Add photo

Norlangarth North Empire (ノーランガルス北帝国, Nōrangarusu Kita Teikoku?) is the northern empire of the Human Empire. The empire has fertile grasslands, deep forests and many lakes. Rulid Village is the northernmost village in this empire. Zakkaria is a town to the south of Rulid Village. Deusolbert Synthesis Seven used to be the Integrity Knight overseeing the Norlangarth Empire.

Eastabarieth EmpireEdit

Eastabarieth Empire (イスタバリエス帝国, Isutabariesu Teikoku?) is the eastern empire of the Human Empire. A defining feature of a resident of the empire is black hair.

Wesdarath EmpireEdit

Wesdarath Empire (ウェスダラス帝国, Uesudarasu Teikoku?) is the western empire of the Human Empire.

Southacroith EmpireEdit

Southacroith Empire (サザークロイス帝国, Sazākuroisu Teikoku?) is the southern empire of the Human Empire. The Empire occupies an area that consists mostly of deserts.

Other PlacesEdit

Edge of Human EmpireEdit

Edge of Human Empire (人界世界の果て, Jinkai Sekai no Hate?) is the border between the Human Empire and the Dark Territory.

Mountain range at the EdgeEdit

The Mountain range at the Edge (果ての山脈, Hate no Sanmyaku?) is the mountain range that surrounds the Human Empire.

Dark TerritoryEdit

Dark Territory (ダークテリトリー, Dāku Teritorī?) is the country of demons. It houses goblins, orcs, etc. It is situated at the other end of the Mountain Range at the Edge.

Underworld Map

Underworld Map

Created by GsimenasCreated by Gsimenas

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Law SystemEdit

All residents of Underworld are generally compliant to any law or rule that they regard as having authority, due to the effects of the Seal of the Right Eye. However, certain individuals, especially nobles, are able to circumvent the restrictions of the laws to satisfy their personal desires.

Human EmpireEdit

In the first decades of the Human Empire, the law system was passed down verbally from generation to generation in the form of parents teaching their children the basic moral rules that they should follow. Only after Quinella founded the Axiom Church, the first written law, the Taboo Index, was published.

Taboo IndexEdit

The Taboo Index (禁忌目録, Kinki Mokuroku?) is the absolute law in the Human Empire that was created by the Axiom Church to ensure Quinella's all-encompassing rule as well as to bind the masses with a sense of moral that suited the church's convenience. This rule system covers all crimes and their respective punishments, as well as prohibits actions that bring harm to other humans and limits hunting and storing food, as the world has limited resources.

Background

Quinella became uneasy that there was a chance that people in the remote regions who have lost their parents before receiving guidance on ethics from them might discover the secret behind the increase in System Control Authority and, if they possessed the genes of nobles, they might follow their desires to such an extent that, by murdering people around them, they would soon over-rank Quinella in System Control Authority. Thus, to reduce the possibility of that happening to the minimum, Quinella published the first edition of the Taboo Index and ensured that every town and village in the Human Empire would get a copy. All parents were then tasked to teach the children in the settlements to abide by her law as soon as they learned language.

Over time, Quinella revised the Taboo Index, adding new clauses that helped people with everyday life by restricting access to swamps that were the source of endemic diseases, listing plants that negatively affect livestock etc., in other words, anyone who followed the Taboo Index would not experience any problems and thus removing the need for people to think for themselves and to question the rule of the Axiom Church.

Known Clauses

1st chapter, 1st passage, 1st paragraph: Loyalty to the Axiom Church.

2nd clause: Unless another clause applies, one shall not intentionally reduce the Life of another person.

One may not claim items that belong to others without permission. This clause only applies to stealing from humans.

All children must be taught the clauses of the Taboo Index.

1st chapter, 3rd passage, 11th paragraph: Not anyone is to go beyond the Mountain range enclosing the edge of Human Empire.

One cannot kiss another person's lips (likely unless they are married).

One may not enter swamps that are deemed to be the source of diseases.

One may not hunt more animals than permitted.

One must not abandon their Sacred Task during work days.

One may not take up too many tasks.

One can only hunt animals if they have the Sacred Task of "Hunter".

Deliberately destroying items that are sold in the shop is against the Taboo Index.

It's against the Taboo Index to not pay for an item if it was broken accidentally.

If the owner excuses a person for accidentally breaking an item, it would not be breaking the Taboo Index.

One may not run away after committing a crime.

Deliberately destroying goods that belong to others is against the Taboo Index.

Obstructing the nobles' right to judge is not allowed.

Other LawsEdit

Aside from the Taboo Index, all empires have an «Empire Fundamental Law» (帝国基本法, Teikoku Kihon Hō?). As all crimes and punishments are covered by the Taboo Index, the empire law is largely made up of conventions concerning the masses’ class system, in other words, the rights of the nobles and the rights of the commoners. The law guarantees the 4th class and higher nobles the right to judge commoners in their territory and lower ranked nobles, usually by cutting down their wages, though younger nobles tend to resort to physical punishment as well. This law was likely established by Quinella when she appointed the lords of the land as nobles in the name of god to secure their support.

Each village also has its own set of rules, for example, Rulid Village’s standards, and certain institutions, like the Sword Mastery Academy, also have their own regulations which hold as much power as the higher laws, however, in case of conflict, the higher laws take priority.

Dark TerritoryEdit

There are virtually no known laws in the Dark Territory, though generally one rule is followed above all else: the weak shall follow the strong.[9] As such, if one's leader is to perish, the one to succeed him would be the next strongest, under him. This is shown when the Leader of a group of Goblins was killed by Kirito, and immediately after, one of his subordinates stepped up to take his place.[10]

SocietyEdit

Human EmpireEdit

Feudal SystemEdit

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Sacred TasksEdit

A Sacred Task (天職, Tenshoku?, literally "Vocation") is a lifelong occupation assigned to each individual in the Human Empire. Most people are assigned their Sacred Task at the age of ten during Spring, with very few exceptions, for example, the children at the Axiom Church who can receive their Sacred Task even at the age of five while a child who is very gifted in Sacred Arts may have their Sacred Task postponed to allow them to train their talent. A Sacred Task is usually assigned by a village chief, the ruler of a town, a high-ranking noble with their own territory or a minister from the Axiom Church - the people in charge of the area where the child was born.

The Sacred Task assigned to a person the first time cannot be chosen by the people themselves and, once a Task is assigned, it is impossible for even those who assign the Tasks to revoke them. However, certain tasks can be changed if the person is promoted, for example, a village guard may become a sentry in a local town, a student at the Sword Mastery Academy, and even an Integrity Knight in the end, if they meet certain requirements. Additionally, if a Task has an end and is completed, the person may choose their next Sacred Task themselves.

In practice, the eldest son of each household is usually given the same Sacred Task as their father: a tool shop's owner's son would continue working in the shop, a guard's eldest son would become a guard and a village chief's eldest son would succeed them as the next village chief. For farmer households, this standard usually applies to their daughter, second and third sons as well, though there are exceptions. People who are assigned Sacred Tasks that do not provide a source of income are given a wage from the village's or city's vault.

Once a Sacred Task is assigned, a person is only allowed to rest from their job on rest days and may not travel in a way that would prevent them from working on their Sacred Task, meaning that mostly only traders could travel long distances, if it is part of their Sacred Task, while an average villager would only be able to travel if it was possible to return to their Sacred Task by the next workday.

Certain Sacred Tasks also have certain benefits, for example, a person who is assigned to be a guard is assigned a real sword to use and may spend time practising their sword skills. Although it is possible for someone to help others with their Sacred Task, it's against the Taboo Index to "have many Sacred Tasks".

NamesEdit

The original four inhabitants of Underworld, who were four Rath employees, named the first children using random syllables in katakana. Following that, several generations named their children after variations of their own name. However, after some time, a standard naming convention, in which every katakana used to produce a name symbolized a "wish" that the parents had for their child, arose within the Human Empire and most of the Dark Territory. Repetitions of certain sounds in a name often meant a greater desire for that trait, such as in the case of Rirupirin (リルピリン?), where R sounds, signifying "beauty", appear three times.

Sound	Meaning	Sound	Meaning

Vowels	Sincerity	G	Bravery

J	Hardworking	K	Zeal

N	Benevolence	R	Beauty

S	Wit	T	Vitality

Y	Gentle	Z	Talented at Military Arts

Although this tradition is widespread in the Dark Territory, certain groups have unique naming traditions. For example, goblins often use conjunctive forms of verbs, like Kosogi from the Japanese verb "to scrape". Additionally, distinguished families of the Dark Arts Users choose to name their children using only initials from ancient Darkness Script (English), such as D.I.L..

When it comes to writing names, the common folk of Underworld[citation needed] often use katakana. However priests are able to transcribe kana names into the alphabets of the Holy Language. Rather than a direct transliteration, the process instead involves anglicizing the names[11]. Thus, ユージオ becomes Eugeo, instead of Yujio.

LanguageEdit

There are 2 known languages within Underworld: the Common Tongue and the Sacred Tongue.

Common TongueEdit

The Common Tongue (汎用語はんようご, Han'yō-go?, literally, "General purpose language") is the main language used for writing and speaking in Underworld. It is the equivalent of the Japanese language in the real world, though the language is supplemented with a few words borrowed from other foreign languages. However, the major difference from its counterpart in the real world is that only about 1000 kanji, about the equivalent of 30% of JIS Level 1, are used in Underworld, while other words and most names are written in kana. Although the same language is used throughout the Human Empire, several accents do exist.

Sacred TongueEdit

The Sacred Tongue (神聖語, Shinsei-go?) is the name given to the English language, though supplemented with a few words from other languages, by the residents of Underworld. This language is regarded as a sacred language used to ask the gods for miracles and is not considered as having any special meaning by the average resident, except for those who study the language for Sacred Arts. The language is mostly used in chanting the verses for Sacred Arts and written in system windows, like the Stacia Window, though a few names are also derived from this language, for example, the Gigas Cedar or the Dark Territory. The language can either be written in the English alphabet or in katakana for easier reading.

According to legends spread by the Axiom Church, the Sacred Tongue was passed down to the Administrator by the three goddess during the creation of the world. As the Axiom Church restricted the knowledge on the meaning behind the vocabulary of the Sacred Tongue to just those used in Sacred Art rituals, no known dictionary for the language exists outside the Central Cathedral.[12]

CalendarEdit

For a list of events in Underworld, see Underworld Timeline.

The humans in Underworld have their own calendar, called the Human Empire Calendar (人界暦, Jinkai-reki?, abbreviated as HEC), which was developed by the Axiom Church. This calendar starts dating from about 70 years after Underworld was created, as the Axiom Church attempts to maintain the falsified history that it spread throughout the Human Empire. As the time flow in Underworld depends on the Fluctlight Acceleration rate set, the HEC cannot be aligned with the time in the real world.

Like its Japanese equivalent, the HEC has 12 months per year and, like the Japanese calendar, the names of the months are derived from the number of the month, for example, the equivalent of January is the 1st Month (一月, Ichigatsu?), the equivalent of February is the 2nd Month (二月, Nigatsu?) and so on.

TriviaEdit

Although the order of most names in the series use the Japanese order of the person's Last name then First name, as the setting of Underworld seems be the Middle Ages of Europe, the names of Underworld residents use the Western order of First name then Last name.

Only nobles and rich and/or famous non-nobles have the right to have a family name in Underworld.

The metric system is used in Underworld, however the names for the units slightly differ from those in the English language, even though they have the same value. E.g. meters are called mel (メル, Meru?), kilometers are called kilolu (キロル, Kiroru?), centimeters - cen (セン, Sen?), millimeters - mil (ミル, miru?), liters - lil (リル, Riru?) etc.

There are 8 elements in Underworld in published version, but 10 in web version.[citation needed]

Shear is used as a currency of Underworld.

The map of Underworld imitates Rath's logo: the Human Empire and the Obsidia castle are like the big and small gears, while the shape of the world and the shape of the logo are like the nose of a pig