Kima Cities

A Kima city is a kind of underground city almost synonymous with Akadist religion and unique to Samvara. Permanent life underground in large numbers is uncommon even for Prisms and requires a great deal of effort and purpose. Building or living in a Kima city is not casually done- there are so many potentially lethal factors at play that every member of society must commit absolutely to following their instructions precisely. Quite literally, a Kima means a "place of order" - both of cosmic order and earthly discipline.
From afar, a Kima looks like a mountain, a citadel, and a factory all at once. Its sprawling buildings and towers jut from the rock, huge smokestacks belch endless smoke, and great walled terrace farms encircle the mountain base and rise from mountain plateaus. Approaching a Kima, its watchtowers, farms, and apartments make it seem like a fairly normal surface settlement (if weirdly fortified)- but the surface population is only the tip of the iceberg. Beneath the surface, massive dimly lit underground halls swarm with people of all species. 
Kima are considered magical and divinely ordained, as Halcyon blessed them with Halpara Mushroms to eat, intervened to protect them from Lily of Red, and blessed all Dryads who live in such a city to become Cave Dryads with time. Cave dryads are dryads that no longer need (or have the option to use) the sun for food, but rather have tougher roots to feed in stony ground and more efficient traditional food processing.
But how does a Kima city actually work?

The Anatomy of a Kima

Kima cities are imagined as living organisms by their occupants. The organizations that keep the city operation are its organs. Kima city organs are based on the "sacred anatomy" of all proper sentient life: while a Prism and a human may have different digestive systems entirely, they still have digestion - this "universal functionary stomach" can be found in all proper life, they say.
The Head and the Heart: So, rather unlike a body or a natural community, Kima cities are entirely planned from the top-down. Two organizations manage the planning and administration of the city: the Head and the Heart. The Head is in communion with the divine and acts as the religious body, supreme leadership, and architectural center. The Head manages city planning, draws blueprints, and actually designs the city proper.
The Heart are the administrators, masons, and military enforcers that actual manage the logistics for the Head's plans and the enforcement of its will. They are the bureaucrats, the enforcers, and the overseers that keep the Kima in line and on time.
The Mouth is a sub-organ managed by the head in charge of magic training and use. Strictly controlled as the instrument of the state, they are also seen as superior messengers and scribes of state intent.
The Stomach: The Stomach (more accurately translated as "The Digestion") is easily the most important body for day-to-day operations. The Stomach manages food and water acquisition and rationing- pretty vital to life.
Water management is the first duty of the Stomach and the most vital. To even found a Kima, fresh water is a primary deciding factor, and every Kima's growth and expansion is fundamentally determined by water access. Water is collected from wells, snowmelt, rain collection, and even condensation, and held in large "water vaults". These water vaults use sand filters to remove germs and impurities, creating a somewhat more mineralistic taste. Aqueducts and elaborate pipe systems then transport water around the Kima.
Food management for non-Prisms is a mixed surface-underground effort and a product of close cooperation between The Stomach and The Feet (the labor management organ). On the surface, dryad and human food is grown on terrace farms according to water availability. Trusted laborers are allowed to work the fields and even herd livestock, and many of the best farmers and herders live on the surface along with the surface defense force. Underground, dryad and human food are grown in large mushroom farms held together and expanded by the hardy Halpara Mushrom. These massive mushroom farms are also waste disposal plants for biowaste, non-poisonous garbage, and corpses. There are often alternative local food production methods as well - shrimp farms, cricket farms, etc.
Prism food production is heavily intertwined with the mining efforts that constantly expand the Kima. See "The Arms". 
The Lungs: The Lungs manage ventilation, temperature control, air quality, and forge functions. They check and clean the ventilation shafts, operate the forges and air-movement flames, and make sure that all parts of the Kima have the proper airflow. A Kima's airflow is intended to be circular and constant, with the heat of the forges and fires below causing oxygen-depleted air to rise and create a vacuum to suck in fresh air from above. When functioning correctly, a Kima always has a slight breeze going.
The eternal flames of the forges and Lung-fires have encouraged Lung administrators to explore alternative fuel sources. Many Kima operate on coal instead of wood, and some have even begun to mine and exploit petroleum deposits. The constant operation of the forges also provides an opportunity for constant production - there is always something smelting, forging, or casting in the depths of a Kima city.
On top of air and forgework, the Lungs often are saddled with managing light sources- though this is lower as a priority. Mirrors, Suntail Grass, strategic use of Halpara mushrooms, and magical lighting are all employed- though all but the richest of Kimas have incomplete lighting at best.
The Arms: The Arms are the great mining apparatus of the Kima, the engines of eternal expansion. They carve out new spaces, produce Prism food, and accumulate valuable ores and minerals. 
There are two main kinds of mining operations: vein miners, which pursue ores for extraction and processing, and clearance miners that carve out new spaces.  
All kinds of mining operations must pass their mined material by "Earth Hunters" - Prisms that examine extracted rock for valuable minerals. These Earth Hunters are more on the hunt for Prism food than ore, and are often trained and supported by The Stomach. Excess rock is then either used as building material (if in large pieces), used in concrete, or broken down into gravel. 
Generally, clearance mining is considered more precise, more skilled, and more high-prestige. Clearance miners often work under better conditions and are considered socially valuable. Not all vein mining is alike - some mines have better conditions than others, and more productive and obedient miners are assigned to better mines and mining jobs than others.  
The Feet: The feet is essentially a labor management organ. They provide laborers for the other organs (notably the Stomach and the Arms) as well as for construction and general labor. The Feet have the bulk of the population under their direct administration. They assign tasks and adjust caste, moving workers between mining, agriculture, construction, and other forms of "body labor". 
The Feet are not just labor managers, but a kind of behavior police that reward collaboration and obedience and punish disobedience or rebellion. They rarely move laborers between types of work entirely (consistency is valued). Rather, they move working-caste children towards areas of labor shortage and act as promoters/demoters. 
The Thighs The Thighs are the merchant and artisan organ, managers of "luxury items". The most notable of these (and least centralized) is textile production. Some Kima use a "family system" where extended family units are given flax for weaving into textiles. Other Kima try a more work-oriented approach, with workers gathered into pods and given the resources to produce their own clothing. Some rare Kima have tried to make textiles into a full top-down enterprise of mass production and distribution, but this tends to be rarer. 
Artisans are somewhat self-regulating units that are given children to train, resources, and production quotas. Every Kima is different in how it deals with these artisanal cliques. Artisans also tend to work closely with merchants to produce surpluses and cover shortages. 
Merchants are liminal figures that are looked upon with uncertainty and sometimes suspicion. They are necessary, but often seen as scoundrels that can threaten the social order. And yet, the Kima needs them: it is rare for a Kima to be truly self-sufficient, and they have a great deal to gain from trade.