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Base Information: H-Corp Hongyuan Bioengineering Group or H Corp. is one of the 26 Wings of the City, overseeing District 8. The entirety of District 8 is contained within a single gargantuan building called Hongyuan (Mandarin: 鸿园, lit. The Vast Garden). District 8's Nest lies at the center of the structure, while the Backstreets form the periphery of the building. Different areas of Hongyuan have different Taboos imposed upon the residents within. The structure of Hongyuan is a remnant of an old H Corp., and is still under the effects of its Singularity. Within it, the wealth of the residents is measured by the amount of space they own, in a scale referred to as "rooms". Rooms are redistributed by the Singularity during a period called "Restructuring Day": the process of restructuring redistributes space based on the residents' net worth, and involves the buildings within the complex shifting and moving at great speed and force.Those who do not have any residence or find themselves without enough room will be thrown around by the movement of buildings, typically to their deaths.

District 8 does not make use of cars; instead, a common method of transportation is the "Palanquin". In District 8, a Palanquin refers to a car chassis manually carried by people stationed beside each wheel.

Historically, the company has been controlled by the Family Hierarch of Daguanyuan, a building complex located at the very top of the Nest, where the members of the most prestigious families of the District reside. Among them, the Jia family has always been the most influential, surpassing the previously prestigious Shi family. Prior to the ascent of Jia Mu, the other families of Daguanyuan had been overshadowed for a time by the Kong Family, which aided Jia Mu during the Family Hierarch Evaluations, allowing her to claim the title, and which led the research of the Bioengineering Group up until around two decades before the events of the main story. The Kong family's work, which focused on high quality Boluses, brought the company to City-wide notoriety.

The family's glory would reach a premature end by the hand of Jia Mu: together with a group of H Corp. researchers, the Hierarch began working on a new Bolus, which she claimed would create a thirteenth Heishou Pack, that she would then present at the Kong family headquarters. In truth, Jia Mu had created a Bolus that would generate Cuckoospawn Humans, or Niaojia-ren (鳥鴶人), violent and sentient creatures from the Outskirts, which began killing all in attendance at the Bolus' unveiling. As the presence of non-human sentient beings within the City is forbidden by a Taboo of the Head, a group of Arbiters and Claws, led by Garion was summoned to suppress the creatures and annihilate the Kong family, which was held responsible for having brought them to the City.

After the Kong family's fall, the Jia family would take the role of leadership from them. The incident left behind one survivor of the Kong family, the descendant Jia Qiu, who would leave Hongyuan for many years, returning only in 985 to participate to the Family Hierarch Evaluation as a member of the Jia family.

Singularity: H Corp.'s Singularity is called the Bolus (Mandarin: 丸药). H Corp. manufactures Boluses that contain "essences of treatment" and can transform the body. These Boluses can be used in a variety of ways, including but not limited to:

Taken orally, in powder or pill form; Mixed into food or drink; Soaked into bandages and wrapped around injuries; Applied as an ointment. The creation of a Bolus is an alchemical process that bears resemblance to traditional chemistry or medicine-making, albeit far more esoteric in nature. Highly specific ingredients are combined in accordance with their properties to create a harmony, with the entire process being highly sensitive to external factors such as the storage method, processes of preparation, or even spacetime itself; for instance, the same recipe used at a different hour of the day may yield a different effect. In addition, the ingredients used obey laws dictated by concepts found in Taoism: these include yin/yang alignment, the elements of the Sexagenary cycle and five phases, alignment according to the eight trigrams, and more. Treatment involves selecting the appropriate technique from a myriad of choices to address the specific deficiency in status to be addressed. Heavy and/or frequent use of Boluses can lead to a variety of side effects, generally causing unsightly mutations. District residents will typically refer to victims of these side effects as "regulars".Bolus treatment may also be utilized to produce directed mutations, such as those applied to Heishou Pack members.Notably, these treatments are seen as different from the ones administered by K Corp. for this reason; K Corp. ampules work by "restoration" of the body to its original state, while the Bolus works more via "transformation" or "evolution".

The Boluses are also used to create the Heishou Packs, with each pack having a secret recipe for the Bolus needed to become one of them. According to Garion, those who ingest these Boluses gain traits and abilities akin to creatures in the Outskirts.

Other Technology H Corp. offers a Life Insurance policy, which allows for the resuscitation of a person after death, provided that the brain is left intact. The procedure can result in "'losses' in the process of information transference"., often leading to degeneration of personality/memory and mental instability (especially with less expensive packages), and can allow for the subject's personality to be modified according to the clients' requests,as was the case for Xiren.

Another sight in H Corp. is the Anamnaworm, a metamorphosis of a human being into a grotesque, worm-like creature with a sunken human face. Anamnaworms retain all the memories of their original self, and anyone who assimilates the Anamnaworm into their body, usually by insertion into an orifice such as the ear, will gain the memories of the original human.Once an Anamnaworm is assimilated into the host's body, it is nearly impossible to remove until a preset series of conditions laid out upon its creation are met.Because of these reasons, Anamnaworms are a popular way for high-ranking families to conceal and pass down their secrets, or even for mundane reasons such as providing the memories of having tasted many wonderful cuisines.One particular Anamnaworm is the Xianhuang Worm, the original founder of H Corp. who transformed himself into a worm as to live on eternally through his future successors.

It is plausible that these technologies use the Bolus as their basis, but this remains largely unknown

Setting = The City is a massive urban complex the size of a small country, and has a population of around 7 billion. The City is bordered to the south by the Great Lake, and to the other directions by the Outskirts. The City is divided into twenty-six Districts, quite diverse in culture and aesthetics, each of which is governed by a Wing, a corporation that has ascended to claim complete control of said area. All Wings respond to the Head, the supreme governing power of the City. The arrangement of the Districts seems to be static, as there has been no mentioned case of a District expanding into a fallen Wing's territory. Each District is split into a Nest, a territory directly governed and protected by its Wing, and the Backstreets, expansive spaces of wilderness or slums, largely neglected by the Wings, where the Syndicates of the City run free. Districts tend to have similarities to their neighbors, and are typically grouped into four sections: the northern, eastern, southern, and western quarters. These quarters may be distinguished by commonalities including culture and temperature, such as the same Fixer Associations differing in garb and fighting style across different quarters, or the northern quarter having colder weather.

The Head is the leader of the Wings and the central governing body of the City. It is in direct control of A Corp., B Corp., and C Corp., the three Districts at the very center of the City. The Head's identity is completely unknown, although it appears the term refers to a group of people rather than a singular entity; any detail regarding it is a closely guarded secret. The Head, through A Corp., retains control of the entire City. It is responsible for authorizing Wings, managing patents, and the minting of Ahn, the currency used in the City. Despite this, it does not typically interfere directly with the affairs of the various Wings in their own Districts; rather, the Head's greatest involvement in the life of the City consists in establishing and enforcing the rules that relate to the overall ethics of the City. The Head is backed up in its functions by the Eye and the Claw, the two authorities responsible for B Corp. and C Corp. respectively. In enforcing the laws of the City, the three Wings make use of three types of agents: the Arbiters, the Beholders, and the Claws.

The Wings of the World are a group of the twenty-six largest, most powerful conglomerates in the City. Each Wing acts as the governing body of a District of the City, and is commonly referred to with a letter from A to Z, corresponding to the number of the District in their control. Wings generally oversee all facets of living in the Nest of their District, while leaving the residents of the Backstreets to fend for themselves. A Nest is the urban center of a District, which is under the direct management of its Wing. The citizens and employees of a Wing are commonly referred to as "feathers"; the status of a feather is widely considered one of the best and most secure paths in life, which the people of the Backstreets are often willing to go to great lengths to obtain. To gain access to a Nest, a corresponding Nest migration permit is required, while to be granted temporary passage one must be in possession of a visa unique to the specific Nest. Visas are implied to be relatively common, with corporate employees being provided with work visas that allow them as easy passage; Nest migration permits, on the other hand, are highly sought after, and implied to be expensive enough that even Grade 1 Fixers would struggle to obtain them. Each Wing has its own cultural style and social structure which are reflected in how it governs its Nest, and the policies that regulate the way of life in the District's Backstreets.

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In the City, a common path in life for those without better options is that of the Fixer. A Fixer is a sort of handyman, who can be hired for everything from menial tasks to active combat. Fixers are subject to a grading system based on the missions they complete. A Fixer starts at Grade 9 and can be promoted to a higher grade, all the way up to 1; in the case of a Fixer being caught breaking work regulations, they can lose their status and be demoted to a lower grade. A majority of Fixers congregate in Fixer Offices, small to mid-sized businesses led by and composed of Fixers. Offices process requests dedicated to whomever in their ranks may be best suited. Offices can work independently, or they can be associated with particular Associations of Fixers, which are larger professional organizations with City-wide influence, with particular interests aimed at the Fixers working beneath them. In the case of a Grade 1 Fixer demonstrating great renown in any particular field of work, they may be considered beyond the grading system, and receive the title of Color from Hana Association as a way to signify their exceptional skill. Color Fixers can keep working in their Offices, or be contracted by a company. They are admired throughout the City, and it is a common belief that the life of a Color is one of true freedom. Despite this, Color Fixers are still bound to the regulations of Hana Associations and of the Head, and due to their ability they're often made to handle the most dangerous hazards of the City.