A Tour of Anvillon | Notes About the Setting

 The Seven Stations
Assuming you travel by land, your first destination in Anvillon will be one of the seven rail stations surrounding it. The rail lines themselves are reserved foremost for the transit of goods and resources, but the facilities serve as checkpoints to manage the flow of people heading in and out of the border. An individual trying to enter without passing through would be forced to overcome the great, featureless, enclosing walls -  all for the reward of joining the heaving masses of the clanless within the rusted sprawl of the outer city. Heading through one of the station terminals instead will lead straight to one of the main roads that lead directly to the inner layers (though not without demonstrating your right of entry first).

 The Outer Confines
Regardless of your approach, it will be necessary to pass through, or over, the outer city in order to head further into Anvillon. This entire region is submerged in a dense, industrial smog of pollutants and chemical fumes too dense to escape into the upper atmosphere, so displacing the breathable air instead. Every building is either a factory or a storage centre in design, though almost all double as makeshift homes for the denizens of the Confines. Access further into the city is controlled by Anvillon's enforcers using blocky calculation engines, each large enough to require a room for itself, to monitor the flow of people and check and update permissions throughout the city in bursts of clacking machine chatter sent between each post. In the event that a visitor travels without the appropriate permissions, an alert will be transmitted to a nearby enforcer base and a team of their persecutors dispatched to hunt the intruder.

 The Interlocks
The Interlocks serve as the great trading district of Anvillon. Situated between the outer and inner layers, it moderates the flow of goods to ensure that everyone has access to the resources imported and refined within the city, provided that they can produce the funds for it. Although it is strictly forbidden, secret deals and backalley trades still happen outside of the Interlocks, especially in the churning chaos of the Outer Confines, so specialist divisions of enforcers known intimidatingly as Executioners (more figuratively than literally, not that many who earn their ire care for the difference) are responsible for meting out the harshest punishments to any rulebreakers. There are few residential buildings in this layer, with almost all of the space being reserved for markets and warehouses. The majority of the official enforcer groups are also stationed in the Interlocks, allowing them to swiftly reach the other locations within the city.

 The Firstbuilt
'Firstbuilt' is a term used to describe those houses, workshops and facilities that were constructed at the founding of the settlement that would grow to become Anvillon. Since then, the city has spread ever outwards, driven for the most part by the demands of the founding clans and their growing influence in the world. Now, these buildings have risen far above ground level, growing taller as the city grows wider, with extensions and developments being steadily made to further the research and production facilities available to the clans.