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Crack Engines
Engine Machines created through the use of the Phenomenon Equation, either to be equipped on^nor implanted into a human body. They were originally developed as artificial limbs for hosts of physical mutations, but their present applications have expanded to include strengthening of the mind and body. Many humans in the Lower Tiers have substituted these Engines for mutated bodies or limbs lost in Monster attacks.

At present, Runners, drug gangs, and Upper Tier Soldiers all own Crack Engines. They give a strong impression of heightened battle strength. They were originally developed as artificial limbs for medical purposes. Those Machines were meant to make up for lost bodily functions without being rejected or overburdening the body. In the Lower Tiers, victims of accidents, Creature attacks, mutations or other strange diseases very often have these. Most medical Crack Engines would be highly priced were they genuine Upper Tier-Approved Goods. Therefore, the people of the Lower Tiers obtain cheap, illegal Crack Engines from back-alley doctors and markets. It's said there are Engine Factories which mass produce cheap Crack Engines for the Lower Tiers. Unlike genuine ones, they're very likely to be rejected or overburden the user. The City's Upper Tier maintains its silence on this matter.

Crack Engine Connectors can be implanted into the body to synchronize with Calculation and Information Accumulation Engines, thereby obtaining all sorts of information. They're activated by touching Calculation Engines and focusing one's consciousness on them. Beginners' Crack Engine Connectors are tiny things implanted into the head (the occipital lobe to be precise) and any scars from the surgery are covered up by hair. Many humans in the Lower Tiers save up for shady doctors, and in exchange for the risk of losing their lives in failed surgeries, become able to heighten their Engine Factory's productivity. The "high class" Crack Engine Connectors prohibited by the Upper Tier require surgical replacement of portions of the brain. Those surgeries have an exceptionally high failure rate, but when they succeed── Those humans become able to control most Calculation Engines and gain supernatural information handling abilities. However, finding a shady doctor with the skills to pull off brain replacement surgery is probably much harder than the surgery itself.

──About the birth of Crack Engines: A technology which withholds strain on the body and its resistance to implantation by carving the Phenomenon Equation into Engine Machines. By-products of the Phenomenon Equation Experiment. A blessing given to the City by the Phenomenon Equation Experiment. The cutting edge of artificial medical limbs. That's how the City commonly understands them. But that's nothing more than the result. There is a different meaning behind the Crack Engines' existence. The real reason why they were developed. The act of carving an Equation which bends the laws of physics into an Engine Machine. No one knows the true reason for doing that. The Grand Prince tried to turn a certain Machine into a living being. Did he succeed? Or did he fail? Only the Crack Engine technology he left behind tells us. Then, what Machine was it? What Machine had the Grand Prince been working on? It's said that it came from Seikyou. A Machine in the form of a book granted to him by an association called the Scholar Society. It was an Engine Book saying that various illusions slept in this world. The Grand Prince tried to solve that riddle. He used all of the technology at his disposal. He sacrificed his own brain and countless Scholars. He used the lives of himself and the Scholars like firewood. And then...... ......the Original Existence descended.

──About Crack Engines: Engine Machines created through the use of the Phenomenon Equation, either to be equipped on nor implanted into a human body. A type of Engine Machine that doesn't exist elsewhere in the|《Known World,》|but is unique to the isolated Inganock. They were originally developed as artificial limbs for hosts of physical mutations, but their present applications have expanded to include strengthening of the mind and body. Many humans in the Lower Tiers have substituted these Engines for mutated bodies or limbs lost in Monster attacks. The substitution surgery used to implant them is colloquially called "Enginization." There do exist some Lower Tier Citizensmwho Enginize themselves out of convenience── But they're different from those with "over forty percent of the body Enginized." They're said to be at extremely high mental and physical risk, but there are very few of them. There are many Runners who "Enginize" themselves by implanting Crack Engine Limbs developed for combat into their internal organs. If one becomes a completely Enginized "Engine Human," it's rumored that one could annihilate even a large Monster. However── The burden placed on the brain and the mind is amazing, and no successful instances of a complete substitution surgery have ever been recorded. A certain group of people call this technology|「Cybernetics.」

──About Engines: They supply various forms of mechanical power, perform high level calculations, and even manage information. They are a key part of civilization across all of the|《Known World.》| At present, although Inganock is isolated from the rest of the world, it's no exception. Engines appear all over every Tier of the City. They're all External Combustion Engines, and the greater the size, the greater the output. Aristocrat's mansions and Engine Factories, as well as some merchant homes, are allowed to set up large- and medium-sized Engines. At the level of an ordinary subject or citizen,^none small-sized Engine exists in each house. In addition── These past few years, it's become normal for people to steal Engine Energy. The most popular targets are City Administration's power conduits. They're used to power the large machines it manages in each Tier.

The City Skyscraper
The Tier Plate located closer to the Upper Tier than any other Lower Tier Plate in the City of Inganock. It has roughly the same altitude as the Upper Tier Staircase Parks. The Tier is constructed out of High-Rise Buildings. It was once built up as a key part of the Arcology City Plan, but because of the calamity ten years ago, a number of High-Rise projects were abandoned. At present, City Management is based in the Tier's Administration Ward. It operates Engine Energy Management Wards in all parts of the City. The City Skyscraper also supplies the Engine Energy used by the Information Network Core. It distributes the vast Engine Energy produced by enormous Engines to all parts of the Lower Tiers. It truly could be called the heart of the City. Many of the extant High-Rise Buildings could be called enormous Calculation Engines. A number of great companies and industries in the City have fortresses, called High-Rise Buildings, in the City Skyscraper to show off their power.

Military
──Highness Agents... ──And the Street Knight: They were heroes in the alleys of the Lower Tiers nwhispered of for years after the|《Revival.》| They had received Enginization surgeries with very low survival rates, becoming the most skilled of all the Engine Humans. The Heavy Engine Humans. They subjugated Creatures and Monsters with strength, power and otherworldly speeds far removed from humans. They sprinted faster than bullets. They reclaimed the Lower Tiers for humans. The present state of symbiosis between people and Monsters is often theorized to be their doing. There also exists a theory that the Street Knight^nis one of the Highness Agents. Nothing has been discovered which might disprove that, but── For the Highness Agents, who've become synonymous with Death Enforcers, the current Lower Tiers show cold reactions. Nowadays, there is only one hero in the City. Namely, the one and only Street Knight. ......of course, he was also a hero active in legends of the past. For several years, there have been no reports of the Street Knight's activities. Not even sightings.