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   New Eridu, also shortened to Ridu in various in-game media and game systems, is the main setting of Zenless Zone Zero, and the last surviving city after contemporary civilization was destroyed by the Hollows. New Eridu managed to survive and thrive after the apocalypse by acquiring the technology to be able to extract resources out of the Hollows. Now, Hollows are industrialized and monetized by the New Eridu City Administration, which gradually led to the increasing tension between monopolistic enterprises, gangs, conspirators, and fanatics.

   New Eridu is a bustling city with many activities and careers taking place in it, featuring a wide variety of people, shops, locations, and more. Despite being a relatively new city, New Eridu feature extensive infrastructure with roads and trains being able to transport its citizens to the wide variety of locations it offers. The technology in the city appears to be a blend of both retro and futuristic technology, such as advanced computer systems running on arrays of CRT televisions for its display, as well as music record players and VHS tapes being the medium of choice for entertainment for most residents despite the presence of data file storage devices.

   Hollows are supernatural disasters in Zenless Zone Zero. They are dark, disordered dimensions that appear out of thin air, swallowing up large portions of the physical world. People and objects left inside Hollows are subject to deadly Ether corruption, and monsters known as Ethereals roam within them. Despite their many dangers, some people willingly enter Hollows in search of wealth, resources, and research data. Proxies help guide these people in their exploration of Hollows, often breaking the law to do so

   Roscaelifer, also known as the Celestial Nexus or The Floating City Among The Skies, is a highly classified floating island location within New Eridu's airspace zone in Zenless Zone Zero. Located in the Minerva Storm Belt, this serene and secretive "Bangboo utopia" was founded by Sunbringer during Old Eridu and is governed by five major departments—the Administrative Affairs, External Strategy, Flint Workshop, Central Computing, and Airspace Patrol departments—alongside secondary bodies like the Council of Representatives. Although humans, Intelligent Constructs, and Bangboo live in harmony here, Bangboo make up over 60% of the population and hold full citizenship rights. However, a tense undercurrent exists because the External Strategy Department enforces a mandatory decommissioning policy that wipes a Bangboo's memory after their work is complete, an experience the population views as akin to death. Despite its isolation, the city's secrecy is increasingly threatened as the "Three Pacts" of TOPS actively maneuver to secure the restricted zone for their own purposes.

   Combat Skills Mindscape Cinema Decibels — A resource used to active Ultimates Energy — A resource used to active EX Special Attacks

   Fighting Style Specialties Attack Stun Anomaly Support Defense

   Attack Types Slash Strike Pierce

   Attribute Fire Electric Ice Frost Physical Ether

   Mechanics Attribute Anomaly Daze Decibel Rating Aftershock

   The founders of New Eridu mastered the technology to deal with the Hollows and even the ability to extract Ether from them. The entire city's prosperity relies on this precious resource, a magic exclusive to New Eridu!

   Ether is a naturally occurring substance in the world of Zenless Zone Zero. It is highly abundant in Hollows and it corrupts and consumes all organic matter, as well as most inorganic materials. Living beings exposed to Ether in the Hollows without protection will gradually fall ill and be transformed into Ethereals.

   The old capital, Eridu, developed technology to extract Ether from Hollows and use it as a resource. New Eridu continues to utilize this technology today.

   Ethereals are the mutant flora and fauna created by Hollows. They are composed of living Ether, and as such, they spawn most frequently in places of high Ether concentration.

   Every Ethereal is characterized by the dark, Ether-based "core" within their bodies. Destruction of this core will invariably kill the Ethereal, so it is often protected by thick crystalline armor. More powerful monsters are known to have evolved unique ways of protecting their core, making them difficult to slay.

   Ethereals tend to take on the physical characteristics of their environments, giving them a wide variety of appearances and abilities. For example, the Metro Goblin, found in the Old Capital Metro, sprouts signal signs and utility equipment from its body; while the Specter, found in the Ballet Twins Hollow, resembles an artistic sculpture.

   Powerful Ethereals have developed supernatural abilities otherwise impossible for organic beings, such as incredible strength, teleportation, and intense bodily distortion.

   Void Hunter is a prestigious title that has been awarded by the mayor of the city since the founding of the original Eridu. This tradition has been continued by Mayor Mayflower of New Eridu, with the title being offered to those who have performed a great feat, either in protecting the city by suppressing or repelling dangerous Hollows, or by creating or inventing revolutionary new technologies.

   Cunning Hares - The Cunning Hares, originally called Gentle House, is a small but notorious human resource dispatch agency specializing in Hollow commissions. Founded by the streetwise Nicole Demara, the agency has gained a reputation for its high fees, frequent financial troubles, and bad reviews. Alongside co-workers Anby Demara and Billy Kid, Nicole tackles various odd jobs, and after the events of Vagrant's Final Resting Place, Nekomiya Mana joined the team. The Cunning Hares are also regular clients of the legendary Proxy, Phaethon, though they often owe him months' worth of fees.

   Members: Nicole Demara, Anby Demara, Billy Kid, Nekomiya Mana/Nekomata

   Belobog Heavy Industries - Belobog Heavy Industries is a faction in Zenless Zone Zero. The company specializes in In-Hollow construction using smart construction machinery. Before Koleda became president, her father, Khors Belobog was the president of the company. After his disappearance, Belobog's public image took a negative hit.

   Members: Koleda Belobog, Grace Howard, Ben Bigger, Anton Ivanov

   Victoria Housekeeping Co. - Victoria Housekeeping Co. is a small servant agency in Zenless Zone Zero, specializing in services like cleaning, cooking, security, and item acquisition. Led by Von Lycaon, the mayor of New Eridu and a member of the Mayflower Family, the agency's most senior member is Alexandrina Sebastiane. They secretly assist the proxy siblings, providing help like upgrading their HDD system, while spying on the Unknown Corruption Complex and Phaethon's involvement.

   Members: Alexandrina Sebastiane, Von Lycaon, Ellen Joe, Corin Wickes

   Criminal Investigation Special Response Team - The Criminal Investigation Special Response Team, based in the Lumina Square Public Security Office in Janus Quarter, handles criminal investigations, raids, and in-Hollow operations. Led by Captain Zhu Yuan, an exceptional officer with no unresolved cases, the team often hires external experts, like Jane Doe, an enigmatic criminal behavior specialist who works as both a consultant and undercover agent.

   Members: Zhu Yuan, Qingyi, Jane Doe, Seth Lowell

   Obol Squad - Obol Squad, full name Defense Force - Obol Squad, is a defense and peacemaker faction. It is one of the squads currently under command of the New Eridu Defense Force's Obsidian Division.

   Members: Trigger, Soldier 11, Seed/Flora, Orphie Magnusson

   Sons of Calydon is a biker gang led by Caesar King that operates in the Outer Ring of New Eridu. Their official business name as a logistics company is Leaps and Bounds Express Services Co..

   Members: Piper Wheel, Luciana "Lucy" Auxesis Theodoro de Montefio, Caesar King, Lighter, Pulchra FellinI, Burnice White

   Hollow Special Operations Section 6, the newest unit of H.A.N.D.'s armed force, responds to Hollow disasters and tactical operations. Led by the youngest Void Hunter, Hoshimi Miyabi, it includes diverse members like Soukaku, an Oni, and is primarily managed by Deputy Chief Tsukishiro Yanagi. Despite its recent formation, Section 6 has quickly gained a large following and is known for its rivalry with Section 5.

   Members: Tsukishiro Yanagi, Hoshimi Miyabi, Asaba Haramusa, Soukaku

   Stars of Lyra. They are a famous musical group in New Eridu.

   Members: Astra Yao, Evelyn Chevalier

   Mockingbird is a notorious syndicate of phantom thieves, founded by Von Lycaon and Hugo Vlad after the death of their mentor, Jack. Their mission is to expose corruption and bring justice, with Hugo suggesting the name "Mockingbird" to symbolize both their stealth and the fear they inspire. Though they vowed not to kill, tensions arose when Hugo broke the oath, leading Lycaon to temporarily distance himself from the group. Mockingbird's resurgence came with Hugo mentoring Vivian Banshee and gaining widespread attention, including inspiring civilians like Lilac, who was saved from imitators by Lycaon himself.

   Members: Hugo Vlad Ravenlock, Vivian Banshee

   Yunkui Summit is a faction. They were founded by a powerful master with incredible control over Ether, who thus could continue his legacy and guarantee that the evil power within the Qingming Sword could be kept at bay. Their philosophy is saving and helping people, and their cultivation techniques, focused on Ether manipulation, include transposition, weapon control, disease mitigation and communication with animals.

   Members: Yixuan, Pan Yinhu, Ju Fufu, Ye Shunguang

   Unlike most other factions, Spook Shack is not an organized group or company. It is an Inter-Knot forum dedicated to sharing and solving supernatural mysteries and unexplained phenomena. The forum has no entry requirements, and most of its members are online friends who share common interests. Notably, Ukinami Yuzuha, a member of the forum herself, leads her own party of the Spook Shack in Waifei Peninsula, with Alice Thymefield noted as their newest member.

   Members: Yidhari Murphy, Yuzuha Ukinami, Lucia, Komano Manato, Alice Thymefield

   The Krampus Compliance Authority, or Krampus for short. It is a subsidiary of TOPS. Despite being part of The Outstanding Paragons Alliance, Krampus is not a company, but instead a self-regulatory organization for TOPS. Krampus's goal is to watch over the ongoings of the TOPS Round Table, seeing if all actions, no matter how cutthroat or morally grey, follow the core rules and interests of the alliance. If these rules are broken, Krampus is sent to interfere and punish the rule-breakers. Krampus has gained a fearful reputation in TOPS, with one its members, Zhao, being seen and called a "disaster" by employees working for companies in the alliance.

   Members: Banyue, Dialyn, Zhao

   Silver Squad was formerly a squad under the Defense Force's Obsidian Division that consisted of replica soldiers, but it was wiped out during a mission, leaving squad leader Soldier 0 - Anby and Soldier 11 as the only known survivors. Twiggy also managed to survive, but ended up losing all of her limbs and disappeared as black market merchandise for years before managing to obtain the replica manufacturing technology needed in order to revive Silver Squad. She was later stopped by the former captain, now known as Anby Demara, who did not wish to see Silver Company return, and her replicas were destroyed in the process.

   Members: Anby Demara

   The Angels of Delusion are an underground idol group that can be located at 404 Error. The group livestreams from time to time.

   Members: Aria, Nangong Yu, Sunna

   For the purposes of Faction-based effects, all Agents across New Eridu Public Security divisions are considered to belong in one Faction. For example, Jane Doe's Additional Ability: Sore Spot can activate with Cissia, despite them being from different Factions. Likewise, Officer Cui's Additional Ability: Provisional Security Canine had its text updated in Version 2.7 to say New Eridu Public Security instead of Criminal Investigation Special Response Team.

   Members Cissia

   Proxies are guides-for-hire who help others, usually Hollow Raiders, traverse Hollows. Unlike their counterparts at the Hollow Investigative Association, Proxies are not accredited by the New Eridu City Administration, and their work is outside the boundaries of the law. They often complete jobs too risky or shady for the HIA to take on.

   Null_Face is a group of hackers and Proxies, infamous for trespassing in the Hollows and falsifying Carrot data, then assaulting and robbing their victims while also corrupting Hollow data. They were also regularly targeted by the HIA for Inter-Knot crimes, but would hack into the HIA to scrub their own criminal record. Conducting electronic warfare through hacker groups is one of their specialties. Despite their infamy, they quickly rose to being one of the top-ranked Proxy accounts on Inter-Knot after the downfall of Phaethon

   Phaethon is the alias of a Legendary Proxy in New Eridu, representing the combined efforts of Wise and Belle, who operate together as a single Proxy team.

   Wise and Belle

   The Hollow Investigative Association (HIA) is a a faction in Zenless Zone Zero. They are an organization affiliated with the New Eridu City Administration primarily responsible for Hollow disaster response within New Eridu, assisting with Hollow containment, and disaster-related matters. Investigators regularly complete official commissions such as rescues and Ethereal hunts. Unlike Proxies, the investigators of the Association are legally accredited by the city administration.

   The New Eridu City Administration is the government of New Eridu and a faction in Zenless Zone Zero. They have control over the Hollow Investigative Association and New Eridu Public Security, with a partial influence over the New Eridu Defense Force. It is led by the head of the Mayflower Family, Mayor Mayflower.

   The New Eridu Defense Force is a military organization nominally under the New Eridu City Administration, although it has been shown that they are de facto indipendent and with many internal struggles, with the Mayor only holding so much sway over the army leaders. The NEDF have three main responsibilities: Deterring external threats, containing Hollows, and expanding into new territory.

   The Obsidian Division is a division of the New Eridu Defense Force. It is the only remaining division, as all the other divisions were wiped out during the Fall of the Old Capital by Hollow Zero

   Members: Trigger, Soldier 11, Seed, Flora, Orphie Magnusson, Anby Demara

   New Eridu Public Security (NEPS) is a police organization under the New Eridu City Administration tasked with maintaining peace and order within New Eridu. NEPS is responsible for most of New Eridu's administrative and judicial needs. They have branches all over the city, including an office at Lumina Square.

   The White Star Institute is a faction in Zenless Zone Zero. They are responsible for researching and observing the Hollows, particularly Hollow Zero.

   The TOPS Alliance, short for The Outstanding Paragons Alliance, consists of New Eridu's most financially powerful and influential corporate conglomerates. TOPS wields significant influence across all sectors of urban operations, to the extent they're considered equal rivals to the municipal authorities represented by the Mayflower family. Despite their long-standing poor reputation among citizens, TOPS remains synonymous with "quality assurance," attracting numerous corporations vying for a coveted spot in their ranks. TOPS regularly conducts performance evaluations of its members, and once a company's strength declines, even well-established corporations with long histories aren't spared from being shown the door.

   High Ambitions Corp., typically shortened to High Ambitions, is a Faction that appears in Zenless Zone Zero. They are a member of the TOPS Round Table, with their leader holding the "Lead Scepter".

   Rusty Cliff, being another member of the TOPS Round Table, is one of the largest Corporations in New Eridu. At least some of their revenue is derived from the mining of special Ether Crystals via their subsidiary "Rusty Cliff Mining," while they also have stakes in both the entertainment industry and the development of military technology.

   Marcel Group are a company that are known to work primarily in the creation and maintaining of Bangboo. They operate the shop BooBox which allows for the direct purchase of Bangboo for citizens, and also are responsible for the creation and administration of various programs and certifications for Bangboo. Such examples include the Bangboo Training Program which has courses focused on integration with humanity, and Hollow Operations Certificates, which are required for Bangboo that wish to become part of H.A.N.D., Hollow Investigative Association and Public Security in the roles of Agents, Investigators or Officers respectively.

   Three Gates Group is a current member of TOPS that specializes in heavy industries, and its various divisions focus on different types of construction: Three Gates Construction builds and repairs infrastructure; Three Gates Military Tech specializes in weaponry; and Three Gates Industries manufactures vehicles.

   Fugue is an entertainment corporation in New Eridu. It was a big corporation in the TOPS Alliance due to the talents and resources they have at their disposal.

   Midsummer Incorporated was a faction in Zenless Zone Zero. Once a major competitor to Three Gates Corp. within the military industry, the company went defunct during the fall of the Old Capital.

   Vision Corporation is a construction company in New Eridu. They are an ambitious corporation that hopes to join New Eridu's premier business alliance, TOPS.

   Since a lot of Celestia School's students are aristocratic, which would make field trips too risky for their safety, and to cut down on the possible competition and show-offs among them, the school does not organize field trips altogether. The school has a sorority led by Jacqueline.

   Helios Academy is an institute that appears in Zenless Zone Zero. It was the top educational and research institution located in Eridu, Minerva Quarter

   Currently based in New Eridu, the Hoshimi Family consists of Fox Thirens traditionally practiced in martial arts. Their current most prominent members are Hoshimi Souichirou, the tenth-generation head of the family, and his daughter Hoshimi Miyabi, Void Hunter and Chief of the Hollow Special Operations Section 6.

   As one of the former major families of TOPS, the Ravenlocks are obsessed with power and believe in social Darwinism and eugenics, claiming that only the most ruthless and cruel individuals from pure bloodlines are worthy of ruling over society. Therefore, they look down on those who are not pure-blooded nobles like them, considering them as commodities. Competition among family members is fierce, both between direct lineage and side branches and between siblings, while heterochromia is seen as a telltale sign of half-blood status. Following their loss of power within TOPS, they resorted to both hosting charity events and allying with the Exaltists in order to regain the favor of Master Edmund.

   The Thymefield family mainly consists of Rabbit Thirens, and most of them are renowned scholars in Ether science and technology, with relevant education starting from a young age. The Thymefield family also has a good reputation for their rectitude and their contributions in Ether science.

   Grandmaster is a title bestowed upon the Yunkui Summit mystics that have mastered the Way of Ether to perfection.

   Long ago, the ancestors of the Nightwatchers once fought a powerful Ethereal known as the Night Horror for days on end. Right before the Night Horror fell, it released a surge of power, which cursed the Nightwatchers to dream of the Night Horror when sleeping at night. This would make them sleepwalk into Hollows, regaining consciousness only for a brief moment before they turned into Ethereals. However, it also gave them ability to be perceived by Ethereals as their kin, and thus be unbothered by them.

   Another version of the legend states that the tribe deliberately hunted down the Night Horror to seize its power of controlling other Ethereals. When the Night Horror unleashed its final surge of energy, half of the tribe immediately turned into Ethereals, and the other half was forced to defeat them. This sacrifice of their own people was the only reason they were acknowledged by the Hollow and received the gift-curse.

   Due to the threat posed by the Night Horror, the Nightwatchers have adopted a nocturnal lifestyle. If someone falls asleep at night, their family will keep vigil at their side until dawn arrives.

   The tribe possesses a staff that can create illusions of Ethereals and mimic their abilities. It is the only surviving weapon from their ancestors' battle against the Night Horror. For decades, chieftains have used it to fend off Ethereals and protect the tribe from Hollow disasters. The staff is currently wielded by Lucia, and was given to her by the chieftain.

   All members of the Nightwatchers that have been seen thusfar have been goat Thirens. It is currently unknown if the Nightwatchers are entirely/mostly comprised of goat Thirens

   A mysterious organization documented since the Eridu era, they believe that humanity will ultimately evolve into a new form that coexists with the Hollows. They harbor an intense devotion to the so-called "Creator," and records indicate this Creator has intricate connections to the Hollows. Throughout the Exaltist's history, they have repeatedly initiated dangerous operations affecting civilians, leading city authorities to designate them as a dangerous illegal organization. While the Exaltists appeared to fall silent in recent years, they never truly disappeared. Based on current intelligence, although they belong to the Exaltists, Bringer and Sarah are neither Landon's successors nor subordinates, and they don't know Landon's orphan, Dina. They are merely collecting the Sacrifice remains left behind by Landon, but the true purpose behind their actions remains a mystery.

   The Vanquishers are a biker gang in the Outer Ring. At the start of Tour de Inferno (A), they are the most powerful gang in the region, with their leader Pompey holding the title of Overlord. They are the rivals of the Sons of Calydon, with the two gangs competing for leadership in the Tour de Inferno race.

   Janus Quarter is a district in New Eridu. It is described as a premiere shopping district filled with shopping centers, restaurants, entertainment establishments, and the like. The events of Prologue and Season 1 mainly take place in the Janus Quarter.

   Throne Quarter is a district in New Eridu. HAND Headquarters and Waifei Peninsula are located there, the latter of which serves as the main setting for Season 2.

   Pluto Quarter is a district in New Eridu. It was known to be a prosperous district during the Eridu era along with the Minerva Quarter, until various areas were swallowed by Hollow Zero during the Fall of the Old City

   Minerva Quarter is a district in New Eridu. It was known to be a prosperous district during the Eridu era along with the Pluto Quarter, until various areas were swallowed by Hollow Zero during the Fall of the Old City.

   Faunus Quarter is a district in New Eridu. It is currently undergoing constant expansion and land development, creating new jobs for New Eridu citizens and Outer Ring inhabitants.

   Vulcan Quarter is a district in New Eridu. There are industrial areas and factories located here.

   The Outer Ring is a region located on the outskirts of New Eridu. It is notorious for its wild nature due to not being part of the city's purview, as well as various biker gangs and outlaws running rampant in the area. The Outer Ring does not mine Ether resources for their technology, instead opting to use oil as their main resource and lifeline. Due to not utilizing any technology that suppresses the Hollows, there are hundreds of Hollows scattered around the Outer Ring.

   The Administrative Affairs Department is the highest decision-making body in Roscaelifer, led by Eldreda Sunbringer. It establishes regulations, coordinates operations across all precincts, and directs the overall functioning of Roscaelifer.

   For the purposes of Faction-based effects, all Agents across Roscaelifer departments are considered to belong in one faction. This is known because Ultra Jake's Additional Ability description states that the ability activates if there are Roscaelifer Agents in the squad, but it is not restricted to specifically External Strategy Department Agents, for example.

   Description The Airspace Patrol is responsible for maintaining the security of Roscaelifer and its surrounding airspace. It is led by Lindverne Sunbringer.

   The Central Computing Department is responsible for calculating Rosetta Data. It is led by Dracaene Sunbringer

   Flint Workshop is based on the islet of Vyrium and operates with a high degree of autonomy. It is the sole producer and manufacturer of Flint Porcelloy, possessing the world's only Porcelloy forging technology, and it is responsible for the R&D of Porcelloy products and technology. it has honored an ancient pact for generations, providing Roscaelifer with equipment research and development, as well as hardware support. Some of the original Void Hunter Weapons were crafted by this workshop.[citation needed]

   The External Strategy Department (E.S.D.), or Roscaelifer External Strategy Department, is a faction in Zenless Zone Zero led by Administrative Director Velina Airgid and including member Norma Hollowell. As one of the Five Central Departments of Roscaelifer, the E.S.D. serves as the organization's bridge to the outside world, coordinating relations with other districts of New Eridu and often using Marcel Group cover identities when operating externally. Because all Roscaelifer agents count as a single faction for gameplay purposes, its members can trigger faction-based effects seamlessly. Within the lore, the E.S.D. was historically resented and disdained by Bangboo because the department is responsible for erasing the memories of any Bangboo leaving Roscaelifer—a process akin to death that earned Velina Airgid the moniker "Death Witch"—though this deep misunderstanding was ultimately resolved following the events of "A Sleepwalker's Confession."

   Only by pushing past the boundaries of knowledge can you reach the illusion of reality.

   Rosetta Data is the master copy used to recalibrate and cross-check all Hollow data. It is produced in Roscaelifer and officially authorized for usage by Mayor Mayflower.

   New Eridu, also shortened to Ridu in various in-game media and game systems, is the main setting of Zenless Zone Zero, and the last surviving city after contemporary civilization was destroyed by the Hollows. New Eridu managed to survive and thrive after the apocalypse by acquiring the technology to be able to extract resources out of the Hollows. Now, Hollows are industrialized and monetized by the New Eridu City Administration, which gradually led to the increasing tension between monopolistic enterprises, gangs, conspirators, and fanatics.

   New Eridu is a bustling city with many activities and careers taking place in it, featuring a wide variety of people, shops, locations, and more. Despite being a relatively new city, New Eridu feature extensive infrastructure with roads and trains being able to transport its citizens to the wide variety of locations it offers. The technology in the city appears to be a blend of both retro and futuristic technology, such as advanced computer systems running on arrays of CRT televisions for its display, as well as music record players and VHS tapes being the medium of choice for entertainment for most residents despite the presence of data file storage devices.

   Hollows are supernatural disasters in Zenless Zone Zero. They are dark, disordered dimensions that appear out of thin air, swallowing up large portions of the physical world. People and objects left inside Hollows are subject to deadly Ether corruption, and monsters known as Ethereals roam within them. Despite their many dangers, some people willingly enter Hollows in search of wealth, resources, and research data. Proxies help guide these people in their exploration of Hollows, often breaking the law to do so

   Roscaelifer, also known as the Celestial Nexus or The Floating City Among The Skies, is a highly classified floating island location within New Eridu's airspace zone in Zenless Zone Zero. Located in the Minerva Storm Belt, this serene and secretive "Bangboo utopia" was founded by Sunbringer during Old Eridu and is governed by five major departments—the Administrative Affairs, External Strategy, Flint Workshop, Central Computing, and Airspace Patrol departments—alongside secondary bodies like the Council of Representatives. Although humans, Intelligent Constructs, and Bangboo live in harmony here, Bangboo make up over 60% of the population and hold full citizenship rights. However, a tense undercurrent exists because the External Strategy Department enforces a mandatory decommissioning policy that wipes a Bangboo's memory after their work is complete, an experience the population views as akin to death. Despite its isolation, the city's secrecy is increasingly threatened as the "Three Pacts" of TOPS actively maneuver to secure the restricted zone for their own purposes.

   Combat Skills Mindscape Cinema Decibels — A resource used to active Ultimates Energy — A resource used to active EX Special Attacks

   Fighting Style Specialties Attack Stun Anomaly Support Defense

   Attack Types Slash Strike Pierce

   Attribute Fire Electric Ice Frost Physical Ether

   Mechanics Attribute Anomaly Daze Decibel Rating Aftershock

   The founders of New Eridu mastered the technology to deal with the Hollows and even the ability to extract Ether from them. The entire city's prosperity relies on this precious resource, a magic exclusive to New Eridu!

   Ether is a naturally occurring substance in the world of Zenless Zone Zero. It is highly abundant in Hollows and it corrupts and consumes all organic matter, as well as most inorganic materials. Living beings exposed to Ether in the Hollows without protection will gradually fall ill and be transformed into Ethereals.

   The old capital, Eridu, developed technology to extract Ether from Hollows and use it as a resource. New Eridu continues to utilize this technology today.

   Ethereals are the mutant flora and fauna created by Hollows. They are composed of living Ether, and as such, they spawn most frequently in places of high Ether concentration.

   Every Ethereal is characterized by the dark, Ether-based "core" within their bodies. Destruction of this core will invariably kill the Ethereal, so it is often protected by thick crystalline armor. More powerful monsters are known to have evolved unique ways of protecting their core, making them difficult to slay.

   Ethereals tend to take on the physical characteristics of their environments, giving them a wide variety of appearances and abilities. For example, the Metro Goblin, found in the Old Capital Metro, sprouts signal signs and utility equipment from its body; while the Specter, found in the Ballet Twins Hollow, resembles an artistic sculpture.

   Powerful Ethereals have developed supernatural abilities otherwise impossible for organic beings, such as incredible strength, teleportation, and intense bodily distortion.

   Void Hunter is a prestigious title that has been awarded by the mayor of the city since the founding of the original Eridu. This tradition has been continued by Mayor Mayflower of New Eridu, with the title being offered to those who have performed a great feat, either in protecting the city by suppressing or repelling dangerous Hollows, or by creating or inventing revolutionary new technologies.

   Cunning Hares - The Cunning Hares, originally called Gentle House, is a small but notorious human resource dispatch agency specializing in Hollow commissions. Founded by the streetwise Nicole Demara, the agency has gained a reputation for its high fees, frequent financial troubles, and bad reviews. Alongside co-workers Anby Demara and Billy Kid, Nicole tackles various odd jobs, and after the events of Vagrant's Final Resting Place, Nekomiya Mana joined the team. The Cunning Hares are also regular clients of the legendary Proxy, Phaethon, though they often owe him months' worth of fees.

   Members: Nicole Demara, Anby Demara, Billy Kid, Nekomiya Mana/Nekomata

   Belobog Heavy Industries - Belobog Heavy Industries is a faction in Zenless Zone Zero. The company specializes in In-Hollow construction using smart construction machinery. Before Koleda became president, her father, Khors Belobog was the president of the company. After his disappearance, Belobog's public image took a negative hit.

   Members: Koleda Belobog, Grace Howard, Ben Bigger, Anton Ivanov

   Victoria Housekeeping Co. - Victoria Housekeeping Co. is a small servant agency in Zenless Zone Zero, specializing in services like cleaning, cooking, security, and item acquisition. Led by Von Lycaon, the mayor of New Eridu and a member of the Mayflower Family, the agency's most senior member is Alexandrina Sebastiane. They secretly assist the proxy siblings, providing help like upgrading their HDD system, while spying on the Unknown Corruption Complex and Phaethon's involvement.

   Members: Alexandrina Sebastiane, Von Lycaon, Ellen Joe, Corin Wickes

   Criminal Investigation Special Response Team - The Criminal Investigation Special Response Team, based in the Lumina Square Public Security Office in Janus Quarter, handles criminal investigations, raids, and in-Hollow operations. Led by Captain Zhu Yuan, an exceptional officer with no unresolved cases, the team often hires external experts, like Jane Doe, an enigmatic criminal behavior specialist who works as both a consultant and undercover agent.

   Members: Zhu Yuan, Qingyi, Jane Doe, Seth Lowell

   Obol Squad - Obol Squad, full name Defense Force - Obol Squad, is a defense and peacemaker faction. It is one of the squads currently under command of the New Eridu Defense Force's Obsidian Division.

   Members: Trigger, Soldier 11, Seed/Flora, Orphie Magnusson

   Sons of Calydon is a biker gang led by Caesar King that operates in the Outer Ring of New Eridu. Their official business name as a logistics company is Leaps and Bounds Express Services Co..

   Members: Piper Wheel, Luciana "Lucy" Auxesis Theodoro de Montefio, Caesar King, Lighter, Pulchra FellinI, Burnice White

   Hollow Special Operations Section 6, the newest unit of H.A.N.D.'s armed force, responds to Hollow disasters and tactical operations. Led by the youngest Void Hunter, Hoshimi Miyabi, it includes diverse members like Soukaku, an Oni, and is primarily managed by Deputy Chief Tsukishiro Yanagi. Despite its recent formation, Section 6 has quickly gained a large following and is known for its rivalry with Section 5.

   Members: Tsukishiro Yanagi, Hoshimi Miyabi, Asaba Haramusa, Soukaku

   Stars of Lyra. They are a famous musical group in New Eridu.

   Members: Astra Yao, Evelyn Chevalier

   Mockingbird is a notorious syndicate of phantom thieves, founded by Von Lycaon and Hugo Vlad after the death of their mentor, Jack. Their mission is to expose corruption and bring justice, with Hugo suggesting the name "Mockingbird" to symbolize both their stealth and the fear they inspire. Though they vowed not to kill, tensions arose when Hugo broke the oath, leading Lycaon to temporarily distance himself from the group. Mockingbird's resurgence came with Hugo mentoring Vivian Banshee and gaining widespread attention, including inspiring civilians like Lilac, who was saved from imitators by Lycaon himself.

   Members: Hugo Vlad Ravenlock, Vivian Banshee

   Yunkui Summit is a faction. They were founded by a powerful master with incredible control over Ether, who thus could continue his legacy and guarantee that the evil power within the Qingming Sword could be kept at bay. Their philosophy is saving and helping people, and their cultivation techniques, focused on Ether manipulation, include transposition, weapon control, disease mitigation and communication with animals.

   Members: Yixuan, Pan Yinhu, Ju Fufu, Ye Shunguang

   Unlike most other factions, Spook Shack is not an organized group or company. It is an Inter-Knot forum dedicated to sharing and solving supernatural mysteries and unexplained phenomena. The forum has no entry requirements, and most of its members are online friends who share common interests. Notably, Ukinami Yuzuha, a member of the forum herself, leads her own party of the Spook Shack in Waifei Peninsula, with Alice Thymefield noted as their newest member.

   Members: Yidhari Murphy, Yuzuha Ukinami, Lucia, Komano Manato, Alice Thymefield

   The Krampus Compliance Authority, or Krampus for short. It is a subsidiary of TOPS. Despite being part of The Outstanding Paragons Alliance, Krampus is not a company, but instead a self-regulatory organization for TOPS. Krampus's goal is to watch over the ongoings of the TOPS Round Table, seeing if all actions, no matter how cutthroat or morally grey, follow the core rules and interests of the alliance. If these rules are broken, Krampus is sent to interfere and punish the rule-breakers. Krampus has gained a fearful reputation in TOPS, with one its members, Zhao, being seen and called a "disaster" by employees working for companies in the alliance.

   Members: Banyue, Dialyn, Zhao

   Silver Squad was formerly a squad under the Defense Force's Obsidian Division that consisted of replica soldiers, but it was wiped out during a mission, leaving squad leader Soldier 0 - Anby and Soldier 11 as the only known survivors. Twiggy also managed to survive, but ended up losing all of her limbs and disappeared as black market merchandise for years before managing to obtain the replica manufacturing technology needed in order to revive Silver Squad. She was later stopped by the former captain, now known as Anby Demara, who did not wish to see Silver Company return, and her replicas were destroyed in the process.

   Members: Anby Demara

   The Angels of Delusion are an underground idol group that can be located at 404 Error. The group livestreams from time to time.

   Members: Aria, Nangong Yu, Sunna

   For the purposes of Faction-based effects, all Agents across New Eridu Public Security divisions are considered to belong in one Faction. For example, Jane Doe's Additional Ability: Sore Spot can activate with Cissia, despite them being from different Factions. Likewise, Officer Cui's Additional Ability: Provisional Security Canine had its text updated in Version 2.7 to say New Eridu Public Security instead of Criminal Investigation Special Response Team.

   Members Cissia

   Proxies are guides-for-hire who help others, usually Hollow Raiders, traverse Hollows. Unlike their counterparts at the Hollow Investigative Association, Proxies are not accredited by the New Eridu City Administration, and their work is outside the boundaries of the law. They often complete jobs too risky or shady for the HIA to take on.

   Null_Face is a group of hackers and Proxies, infamous for trespassing in the Hollows and falsifying Carrot data, then assaulting and robbing their victims while also corrupting Hollow data. They were also regularly targeted by the HIA for Inter-Knot crimes, but would hack into the HIA to scrub their own criminal record. Conducting electronic warfare through hacker groups is one of their specialties. Despite their infamy, they quickly rose to being one of the top-ranked Proxy accounts on Inter-Knot after the downfall of Phaethon

   Phaethon is the alias of a Legendary Proxy in New Eridu, representing the combined efforts of Wise and Belle, who operate together as a single Proxy team.

   Wise and Belle

   The Hollow Investigative Association (HIA) is a a faction in Zenless Zone Zero. They are an organization affiliated with the New Eridu City Administration primarily responsible for Hollow disaster response within New Eridu, assisting with Hollow containment, and disaster-related matters. Investigators regularly complete official commissions such as rescues and Ethereal hunts. Unlike Proxies, the investigators of the Association are legally accredited by the city administration.

   The New Eridu City Administration is the government of New Eridu and a faction in Zenless Zone Zero. They have control over the Hollow Investigative Association and New Eridu Public Security, with a partial influence over the New Eridu Defense Force. It is led by the head of the Mayflower Family, Mayor Mayflower.

   The New Eridu Defense Force is a military organization nominally under the New Eridu City Administration, although it has been shown that they are de facto indipendent and with many internal struggles, with the Mayor only holding so much sway over the army leaders. The NEDF have three main responsibilities: Deterring external threats, containing Hollows, and expanding into new territory.

   The Obsidian Division is a division of the New Eridu Defense Force. It is the only remaining division, as all the other divisions were wiped out during the Fall of the Old Capital by Hollow Zero

   Members: Trigger, Soldier 11, Seed, Flora, Orphie Magnusson, Anby Demara

   New Eridu Public Security (NEPS) is a police organization under the New Eridu City Administration tasked with maintaining peace and order within New Eridu. NEPS is responsible for most of New Eridu's administrative and judicial needs. They have branches all over the city, including an office at Lumina Square.

   The White Star Institute is a faction in Zenless Zone Zero. They are responsible for researching and observing the Hollows, particularly Hollow Zero.

   The TOPS Alliance, short for The Outstanding Paragons Alliance, consists of New Eridu's most financially powerful and influential corporate conglomerates. TOPS wields significant influence across all sectors of urban operations, to the extent they're considered equal rivals to the municipal authorities represented by the Mayflower family. Despite their long-standing poor reputation among citizens, TOPS remains synonymous with "quality assurance," attracting numerous corporations vying for a coveted spot in their ranks. TOPS regularly conducts performance evaluations of its members, and once a company's strength declines, even well-established corporations with long histories aren't spared from being shown the door.

   High Ambitions Corp., typically shortened to High Ambitions, is a Faction that appears in Zenless Zone Zero. They are a member of the TOPS Round Table, with their leader holding the "Lead Scepter".

   Rusty Cliff, being another member of the TOPS Round Table, is one of the largest Corporations in New Eridu. At least some of their revenue is derived from the mining of special Ether Crystals via their subsidiary "Rusty Cliff Mining," while they also have stakes in both the entertainment industry and the development of military technology.

   Marcel Group are a company that are known to work primarily in the creation and maintaining of Bangboo. They operate the shop BooBox which allows for the direct purchase of Bangboo for citizens, and also are responsible for the creation and administration of various programs and certifications for Bangboo. Such examples include the Bangboo Training Program which has courses focused on integration with humanity, and Hollow Operations Certificates, which are required for Bangboo that wish to become part of H.A.N.D., Hollow Investigative Association and Public Security in the roles of Agents, Investigators or Officers respectively.

   Three Gates Group is a current member of TOPS that specializes in heavy industries, and its various divisions focus on different types of construction: Three Gates Construction builds and repairs infrastructure; Three Gates Military Tech specializes in weaponry; and Three Gates Industries manufactures vehicles.

   Fugue is an entertainment corporation in New Eridu. It was a big corporation in the TOPS Alliance due to the talents and resources they have at their disposal.

   Midsummer Incorporated was a faction in Zenless Zone Zero. Once a major competitor to Three Gates Corp. within the military industry, the company went defunct during the fall of the Old Capital.

   Vision Corporation is a construction company in New Eridu. They are an ambitious corporation that hopes to join New Eridu's premier business alliance, TOPS.

   Since a lot of Celestia School's students are aristocratic, which would make field trips too risky for their safety, and to cut down on the possible competition and show-offs among them, the school does not organize field trips altogether. The school has a sorority led by Jacqueline.

   Helios Academy is an institute that appears in Zenless Zone Zero. It was the top educational and research institution located in Eridu, Minerva Quarter

   Currently based in New Eridu, the Hoshimi Family consists of Fox Thirens traditionally practiced in martial arts. Their current most prominent members are Hoshimi Souichirou, the tenth-generation head of the family, and his daughter Hoshimi Miyabi, Void Hunter and Chief of the Hollow Special Operations Section 6.

   As one of the former major families of TOPS, the Ravenlocks are obsessed with power and believe in social Darwinism and eugenics, claiming that only the most ruthless and cruel individuals from pure bloodlines are worthy of ruling over society. Therefore, they look down on those who are not pure-blooded nobles like them, considering them as commodities. Competition among family members is fierce, both between direct lineage and side branches and between siblings, while heterochromia is seen as a telltale sign of half-blood status. Following their loss of power within TOPS, they resorted to both hosting charity events and allying with the Exaltists in order to regain the favor of Master Edmund.

   The Thymefield family mainly consists of Rabbit Thirens, and most of them are renowned scholars in Ether science and technology, with relevant education starting from a young age. The Thymefield family also has a good reputation for their rectitude and their contributions in Ether science.

   Grandmaster is a title bestowed upon the Yunkui Summit mystics that have mastered the Way of Ether to perfection.

   Long ago, the ancestors of the Nightwatchers once fought a powerful Ethereal known as the Night Horror for days on end. Right before the Night Horror fell, it released a surge of power, which cursed the Nightwatchers to dream of the Night Horror when sleeping at night. This would make them sleepwalk into Hollows, regaining consciousness only for a brief moment before they turned into Ethereals. However, it also gave them ability to be perceived by Ethereals as their kin, and thus be unbothered by them.

   Another version of the legend states that the tribe deliberately hunted down the Night Horror to seize its power of controlling other Ethereals. When the Night Horror unleashed its final surge of energy, half of the tribe immediately turned into Ethereals, and the other half was forced to defeat them. This sacrifice of their own people was the only reason they were acknowledged by the Hollow and received the gift-curse.

   Due to the threat posed by the Night Horror, the Nightwatchers have adopted a nocturnal lifestyle. If someone falls asleep at night, their family will keep vigil at their side until dawn arrives.

   The tribe possesses a staff that can create illusions of Ethereals and mimic their abilities. It is the only surviving weapon from their ancestors' battle against the Night Horror. For decades, chieftains have used it to fend off Ethereals and protect the tribe from Hollow disasters. The staff is currently wielded by Lucia, and was given to her by the chieftain.

   All members of the Nightwatchers that have been seen thusfar have been goat Thirens. It is currently unknown if the Nightwatchers are entirely/mostly comprised of goat Thirens

   A mysterious organization documented since the Eridu era, they believe that humanity will ultimately evolve into a new form that coexists with the Hollows. They harbor an intense devotion to the so-called "Creator," and records indicate this Creator has intricate connections to the Hollows. Throughout the Exaltist's history, they have repeatedly initiated dangerous operations affecting civilians, leading city authorities to designate them as a dangerous illegal organization. While the Exaltists appeared to fall silent in recent years, they never truly disappeared. Based on current intelligence, although they belong to the Exaltists, Bringer and Sarah are neither Landon's successors nor subordinates, and they don't know Landon's orphan, Dina. They are merely collecting the Sacrifice remains left behind by Landon, but the true purpose behind their actions remains a mystery.

   The Vanquishers are a biker gang in the Outer Ring. At the start of Tour de Inferno (A), they are the most powerful gang in the region, with their leader Pompey holding the title of Overlord. They are the rivals of the Sons of Calydon, with the two gangs competing for leadership in the Tour de Inferno race.

   Janus Quarter is a district in New Eridu. It is described as a premiere shopping district filled with shopping centers, restaurants, entertainment establishments, and the like. The events of Prologue and Season 1 mainly take place in the Janus Quarter.

   Throne Quarter is a district in New Eridu. HAND Headquarters and Waifei Peninsula are located there, the latter of which serves as the main setting for Season 2.

   Pluto Quarter is a district in New Eridu. It was known to be a prosperous district during the Eridu era along with the Minerva Quarter, until various areas were swallowed by Hollow Zero during the Fall of the Old City

   Minerva Quarter is a district in New Eridu. It was known to be a prosperous district during the Eridu era along with the Pluto Quarter, until various areas were swallowed by Hollow Zero during the Fall of the Old City.

   Faunus Quarter is a district in New Eridu. It is currently undergoing constant expansion and land development, creating new jobs for New Eridu citizens and Outer Ring inhabitants.

   Vulcan Quarter is a district in New Eridu. There are industrial areas and factories located here.

   The Outer Ring is a region located on the outskirts of New Eridu. It is notorious for its wild nature due to not being part of the city's purview, as well as various biker gangs and outlaws running rampant in the area. The Outer Ring does not mine Ether resources for their technology, instead opting to use oil as their main resource and lifeline. Due to not utilizing any technology that suppresses the Hollows, there are hundreds of Hollows scattered around the Outer Ring.

   The Administrative Affairs Department is the highest decision-making body in Roscaelifer, led by Eldreda Sunbringer. It establishes regulations, coordinates operations across all precincts, and directs the overall functioning of Roscaelifer.

   For the purposes of Faction-based effects, all Agents across Roscaelifer departments are considered to belong in one faction. This is known because Ultra Jake's Additional Ability description states that the ability activates if there are Roscaelifer Agents in the squad, but it is not restricted to specifically External Strategy Department Agents, for example.

   Description The Airspace Patrol is responsible for maintaining the security of Roscaelifer and its surrounding airspace. It is led by Lindverne Sunbringer.

   The Central Computing Department is responsible for calculating Rosetta Data. It is led by Dracaene Sunbringer

   Flint Workshop is based on the islet of Vyrium and operates with a high degree of autonomy. It is the sole producer and manufacturer of Flint Porcelloy, possessing the world's only Porcelloy forging technology, and it is responsible for the R&D of Porcelloy products and technology. it has honored an ancient pact for generations, providing Roscaelifer with equipment research and development, as well as hardware support. Some of the original Void Hunter Weapons were crafted by this workshop.[citation needed]

   The External Strategy Department (E.S.D.), or Roscaelifer External Strategy Department, is a faction in Zenless Zone Zero led by Administrative Director Velina Airgid and including member Norma Hollowell. As one of the Five Central Departments of Roscaelifer, the E.S.D. serves as the organization's bridge to the outside world, coordinating relations with other districts of New Eridu and often using Marcel Group cover identities when operating externally. Because all Roscaelifer agents count as a single faction for gameplay purposes, its members can trigger faction-based effects seamlessly. Within the lore, the E.S.D. was historically resented and disdained by Bangboo because the department is responsible for erasing the memories of any Bangboo leaving Roscaelifer—a process akin to death that earned Velina Airgid the moniker "Death Witch"—though this deep misunderstanding was ultimately resolved following the events of "A Sleepwalker's Confession."

   Only by pushing past the boundaries of knowledge can you reach the illusion of reality.

   Rosetta Data is the master copy used to recalibrate and cross-check all Hollow data. It is produced in Roscaelifer and officially authorized for usage by Mayor Mayflower.

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