Eos (Cosmoria)

As far as stars go, Eos numbers among the smallest in Cosmoria. At just 200,000 km across, its habitable zone lies a mere two million kilometers from its surface. Under normal circumstances, this star would have a population somewhere in the billions, a mote on the scale of Cosmoria's civilizations. Eos, however, is not a normal star for surrounding it is a megastructure dwarfing nearly all others. This massive structure is a large flat disk orbiting this dwarf star. On this disk reside 9 trillion, environments unseen anywhere else, and some of the most influential empires in history.

The gateway from Aylathiya to wider Cosmoria, Eos lies in the center of Martial Space. An economic powerhouse: merchants, companies, and governments often use the large structure as a staging ground for their commerce of all kinds. Underneath the trade-friendly orderly surface is an eternal conflict as dozens of factions strive to take advantage of Eos' lucrative position. A gilded world, the guise only occasionally disappears. When it does disappear, however, it disappears with great force, leaving the rest of Cosmoria suffering generation-defining recessions.

Nearly every group imaginable takes credit for the creation of Eos, from the Dotsk who have a reputation for building mega-structures, to nationalists in Florathel that claim only the Lareas Alliance could have created the structure. Historians on Eos sometimes credit its creation to Cosmic Commonwealth of Mages, but the general consensus is that it was created by the nation of Hyperion. Regardless of the origin, it has continually existed for essentially all of recorded history, likely taking much of this time to construct. It is technically unfinished, as a large section of the structure has never been filled in.

The world remained a backwater on the galactic stage until the rise of the Triumvirate Civilization 40,000 years before the present day. This civilization's meteoric rise caused Eos' population to balloon to over 20 trillion by 80,000 CE. When the Triumvirate fractured as its three leaders went their separate ways, the resulting war caused its population to dip below one trillion, resulting in a galactic recession that has still technically not ended. From then, Eos has continually united and fractured until the modern day, currently existing united under the Greater Martial Consilium.

Physical

Embedded within Eos is a large mechanical apparatus of fractal complexity. The task of maintaining the disk against tidal forces, asteroid impacts, opportunists looking to harvest its materials, and other degradation, is one that requires more energy than the remarkably small star can provide. Eos has an entire ecosystem within and around it that serves to maintain the structural integrity of the disk. Powering this ecosystem is a vast sister-structure located around the nearby star of Gira Gira.

Structure

Eos is composed of a substance called Resolute Bronze, a gold-brown-colored alloy widely renowned for its material strength. While most certainly not the strongest material known, it is cheaper than graphene by just enough to sacrifice material strength for the cheaper price. As such, structures like Eos have a maximum theoretical diameter of a little over four million kilometers, about as wide as the structure is currently.

Eos is three million kilometers in radius and has a surface area equal to 25 trillion square kilometers. Embedded within this structure are a series of large orbital rings with a thickness of, on average, 1150 kilometers. Within them, small charged black holes race around the star at relativistic speeds, their momentum cancelling the force of gravity to prevent the disk from collapsing.

The disk is not quite flat, it gently angles upwards to form a concave structure. The reason for this is simple; it keeps gravity uniform and "downwards" across the whole of the disk. Were it perfectly flat, gravity would pull towards the center, straining the orbital rings as well as making life impossible on its surface. The disk thickens as the distance to the star increases. It has 0.01% grade, resulting in only an imperceptible slope across its surface. Minute variations in the thickness results in mountains, lakes, flats, and oceans. Overall, Eos is very smooth.

Climatic Regions

The Icaran Ring

A mere one million kilometers away from its star lies in the innermost region of Eos. Carbon-based life of any kind simply perish in these hellish conditions, becoming a mist within moments. In this region, seas of lead are commonplace, with an entire ecosystem of this lead-based life inhabiting its seas. As the lead evaporates, at a slow rate give how close it is to its melting point, the toxic clouds interact with Eos' oxygen-rich atmosphere, creating particles of lead-oxide which can travel far across the disk. Drifts of the snow-like substance are common much further into the disk, but if they fall back into the Icaran Ring, they will degrade into liquid lead once more.

Silicon dominants the soil of this region, most carbon quickly becomes carbon-dioxide in these conditions. The occasional solar flare from the star can liquefy large portions of the soil, leaving in its wake nearly-pure quartz crystal which cools into massive structures. Large fields of these crystals are often the only feature for hundreds of kilometers. The other structure to break up the flat landscape are massive wind turbines, capable of converting the powerful wind currents of Eos into energy. Winds in the Icaran Ring rarely drop below 50 kilometers per hour, requiring life such as the Atlins to seek shelter in caves or behind large walls. The air is choked with smog, particulates, and other impurities, while also having nearly twice the pressure as it does towards the edge of the disk.

For the past 50,000 years, large mirrors have existed above Eos to concentrate light onto Orcubor settlements, creating regions of over 2000 degrees Celsius. These hellish regions threat the very structural integrity of the disk, requiring extensive cooling systems maintained by various governments. The most extreme of Cosmoria's life, aluminum-based creatures made mostly out of liquid quartz, inhabit these furnace-like conditions.

The Hadean Ring

Further out lies an area that is too hot for liquid water to exist but also too cold for the seas of lead. The only life in this area are organisms capable of weathering its intense extremes. Dotted by the occasional oasis, not of water but of gallium metal, clouds of this material are a rarity. Interaction with air and water vapor from further out causes the gallium to oxidize, creating a thin crust above the lakes of metal. Beneath the seal, low-energy ecosystems are occasionally present.

Life from D'Naevium is perfectly adapted for this environment and exists in isolated communities around the gallium deposits. The animals learned to punch through the thin sheets to drink, while also becoming far more resistant to wounds as their injuries become self-cauterizing. With ferocious abandon, the largest predators know no fear, throwing themselves at anything they can. Vehicles passing through the region are prime targets, forcing travelers to use hyper-sonic trains that not even multi-ton predators could survive an impact with. The trains are usually so large that little could obstruct their path.

Far from the pools of gallium, the only thing to disrupt the landscape are train-tracks, wreckage from an untold number of battles, scavengers, and autonomous machines poking through the igneous soil. Large fields of solar panels are occasionally used to power remote facilities and factories while the occasional settlement, like a space-station for every species except Ror Units, are usually located near to the rail lines. The atmosphere is mostly pure compared to the Icaran Ring.

The Common Ring

The Common Ring is the largest by area and the most heavily-populated. Beginning two-million kilometers from Eos, the ring is dominated by vast seas representing the majority of the water in Martial Space. Remnants of an ancient molecular nebula explain where the resources for the region came from. From the nearly-boiling seas of the interior to the periodically-frozen seas of the edge, the Common Ring is filled with life of all sorts. Every intelligent species, save for the thermophilic Orcubor and Atlins, have large populations in this region.

As one moves from the center of the ring to the edge, the variation in the surface increases. By the time one gets to the common ring, large mountain ranges and valleys dominate the landscape. As for visual variety, the Common Ring reigns supreme as vast forests cover much of it. The forests battle against the massive carbon-dioxide production of not just the Icaran Ring but the intense industry of the region. If a species is carbon-based and can tolerate water, chances are that a population lives on Eos. The interaction between trillions of bacterial species creates a unique ecosystem in which nearly all forms of life can survive. Governments throughout history have had to tailor new viruses to combat dangerous or disruptive populations of bacteria with limited success.

A very small percentage of the Common Ring is inhabited despite its favorable conditions. Its sheer size means that urban areas account for less than a percent of a percent of its surface. The areas between major settlements are truly untamed wildernesses punctured only by the occasional village, of which there are many. There are currently 40 million settlements containing 100 or more inhabitants within the Common Ring. Like the stars in the skies above them, the settlements are spaced-out by vast distances. Many are unaware of the civilization around them and have no access to it.

The Boreal Ring

The Boreal Ring, named for the Boreal Anemoi Company and the Boreal Empire that replaced it, is the newest region as well as the coldest. The innermost area allows for liquid water for brief portions of the year, but most of it remains frozen. Lightly populated, the region is nonetheless home to large amounts of energy-intensive industry such as element synthesis and asteroid refinery. These islands of heat in the otherwise frozen wasteland create wet urban environments. Straying too far from these cities leaves one in endless lifeless snowbanks.

Rail in the Boreal Ring is limited to large freight trains that occasionally have areas reserved for passengers. They are powered by super-coundcting lines embedded in the rails, the cold temperature allowing for cheap superconductors to handle a job usually reserved for the highest-end materials. The newest and largest space-ports on Eos are embedded into this region and the byproducts from constant use of rocket engines, industry, and other activities create toxic pools that would normally evaporate or break down at higher temperatures.

Seasonal Climate

Eos has had a substantial wobble for all of recorded history. If the star were stationary, this would create little to no variance; however, the star effectively orbits the "barycenter" it shares with the disk. This creates a bobbing motion that results in days and nights on the megastructure. Combined with the wobbling of the disk, there are periods, called "Eos Years" over which the portions of the disk receive more or less sunlight. Additionally, in the coolest part of the year, the light received it much less direct. The seasonal climate matters far less in the blazing Icaran ring than it does in the frigid Boreal Ring. At the farthest reaches of the disk, the variation becomes extreme, varying by over 200 degrees Celsius (about -200 to a little below freezing).

Influence by nearby stars and planets also cause the disk to flex very slightly. This flexing and relaxing takes place over six hundred years and is again most influential for the Boreal region than anywhere else. It greatly changes how much sunlight an area is exposed to during the "summer" periods, leading to the Boreal Region sometimes flowering in rare events simply called "Vernal Events," attract tourism but also greatly inhibit industry.

Orbiting Bodies

Eos, in particular the disk-star barycenter, is a fairly massive object and thus possesses a number of orbiting bodies. There is evidence of a heavily-depleted asteroid belt that once existed around the star that may have supplied a portion of the material that makes up Eos. In addition to natural bodies, there are gigatons of material placed into orbit around the body every year, much of it becoming space junk. The oldest material orbiting Eos dates back over five million years.

Albedo

Albedo is the most massive natural satellite of Eos. It seems to have been left alone during the construction of the disk. Albedo orbits just barely beyond the disk at 5.1 million kilometers from the star. Its orbit is inclined by 17 degrees relative to the disk as well. It is the brightest object in the night skies of Eos due to its incredibly high Albedo, hence its name. Consequently, it is very cold on the world. It is covered in a layer of ice; however, islands of thriving ecosystem are found in volcanic regions. geothermal energy heats most of the cities currently on Albedo. It was the first world colonized by Humans outside of their home system.

Hikari

Hikari orbits at about 6.5 million kilometers away from its star. The planet has a very low surface gravity and density, causing it to have a very small population. By mass, it is over twenty-five percent copper. Most scientists believe the planet to be a byproduct of the construction of Eos. Its inhabitants have been slowly eating away at the planet, converting it into raw materials to be sold. Much of the planet has been processed by the industries in the Boreal Ring.

Eosphoros

Eosphoros is a large terrestrial planet located 10 million kilometers away from the star. A Hedonist World, Eosphoros is home to a large number of ruins from the ancient Second Aeternal Society. Its ancient guardians have never allowed an external nation, save for the Triumvirate Civilization, to conquer it. Eosphoros has a thick atmosphere and rich geothermal activity that keeps it warm. It seems to have no intelligent life on it, its inhabitants having evolved into beasts of all kinds, including Aeternapes.

Dark Side of Eos

Reverse the highly populated side of the disk is a sparsely populated region poetically called the "dark side." At different points in history, it was just as habitable as the "light side," however, radiation from the neutron star Demiurge makes it uninhabitable in the present. With only a population of three billion calling this side home, the opposite side is, both politically and economically, the mirror image of the main side. Nations on Eos simply control the territory they possess on the opposed side as well.

Composition

Beyond the internal structure of resolute bronze, Eos is composed of whichever substance was cheapest for the civilization building the section. Some areas are composed of lithium and beryllium, suggesting a civilization capable of large-scale fusion without much use for these materials. Many areas are composed of heavier metals; asteroids were commonly turned into a liquid and used as material for 3D printers. Silicates are common as well. There is evidence that entire planets have been used as feed-stock for some of the oldest areas.

The most recently-built areas, built by the Dominion of Astraeus, are composed mostly of an iron-slilicate mixture. It was created by importing energy from Sagittarium to turn an orbiting dwarf planet, Aura, into raw materials for the expansion of the disk. While most of the disk is solid, filled with an ultra-low-density substance that maintains rigidity despite being mostly vacuum, many of the newest areas have yet to have been filled in, creating a slightly diagonal pull of gravity in those regions.

Biosphere

Across Eos, there exist thousands of unique biomes, ecosystems, and organisms. Since life from throughout Cosmoria, even from as far as Florathel. The Biosphere occupies nearly all of Eos, from the space around it which hosts large amounts of Spaceborne Life to vacuum-tolerant microbes that reside within its interior. The vast majority of biomass exists on Eos' surface, in particular in the Common Ring which accounts for slightly under 90% of its total biomass. Consequently, water-based life is the most common life on Eos.

Ma'eau created most of the life on Eos, the species developed with intention to fulfill specific roles in ecosystems. The entity itself is deeply-embedded into Eos' biosphere and works constantly to maintain its fragile balance. Other forms of life, such as life from D'Naevium, remains isolated and thus rarely interactions with most of the other life.

Marred Regions

A Marred Region is a region of Eos created by Ma'eau during a period of mental dissociation experienced by the entity from 964,000 BCE - 303,888 BCE. Often called "Ma'eau's Civil War" as the various wills contained within it warred against one another. During this period, Ma'eau had a difficult time creating new organisms or guiding their evolution, leading to an increase in genetic diversity or the propagation of undesirable mutations.

Standing in a marred region, one would usually see little of note. In the majority of these areas, bizarre microbes reduced the soil into a slurry of acidic compounds, resulting in a muddy wasteland punctuated by the occasional pool of acid. Deeper into these ecosystems, where these microbes act as the basis of the ecosystem, one would have hardly anywhere to stand. In most of these regions, deep pools of sulfuric acid create swamp-like conditions throughout much of the biome.

Phaethon

To maintain the vast structure of Eos requires far more energy than the small star could ever hope to provide. While power draw from the star is practiced in the innermost regions, most areas require imported energy. Without robust supply chains that can provide all the needed antimatter, industry on Eos crawls to a halt. Those who built Eos were also aware of this glaring problem, the disk requiring nearly ten times more energy than Eos can provide just to stay together.

This is where Phaethon comes in, the system that powers Eos. A decentralized network of quantum computers, servers, and autonomous craft, Phaethon tirelessly works to maintain the orbital rings and the infrastructure powering them. The construct has demonstrated to be somewhat intelligent. Occasionally, its drones will find asteroids or other free material to repair Eos, always careful to never take any obviously artificial material.

Structure

Phaethon is made up of two twin rings, the outermost ring of Eos which is a counter-rotating generator, and a much larger rotating ring orbiting within Gira Gira's atmosphere. The ring around Gira Gira gathers and remotely transmits power to the ring on Eos. There are numerous subterranean factories on Gira Gira's largest planet, Taek, which are most likely responsible for the creation of the various craft Phaethon commands. Something notable about these factories is that they are nearly entirely mechanical, with few electronic devices present. A central line shaft is responsible for the power supplied to each of machines. The factory has never been observed to work, but it is frequented by some of Phaethon's drones.

The drones themselves are similar to the factory and seem to be powered by the gradual release of a spring. It is unclear how they power their sensors or even how they are capable of such complex actions as they are each made up of billions to trillions of often microscopic gears. They contain thousands of smaller machines within them responsible for internal maintenance. Their springs need to be rewound every so often, likely at substations similar to the factory. They are made up of the same tungsten-titanium alloy as the ring. Those that are capable of space travel make use of Thaumic Drives to pick up speed.

On Eos, capturing or otherwise interfering with these drones, even if they cause damage to property, is a capital offense. This is obviously to protect the structural integrity of the structure but to also learn about them. They seem to be somewhat sentient as cameras or sensors placed on them are inevitably removed. There are most likely several factories or substations located within Eos, but internal exploration of the disk is impossible. Boring into Eos is incredibly difficult, Phaethon usually forcibly stops any who try by sending strong electromagnetic pulses at the offending borers. Thus, Phaethon's structure has been shrouded in mystery, the construct doing everything it can to keep it this way.

Operation

Over sixty percent of the Phaethon's components are located around Gira Gira. The main component is a ring composed primarily of tungsten alloy that orbits within Gira Gira's atmosphere. Only a kilometer wide, the ring gathers all the energy needed. To transfer this energy, Phaethon uses a Thaumic Drive. Through the remote activation of a drive located on the external ring on Eos, which most likely shares a pylon with the ring on Gira Gira, the ring on Eos spins. This spinning provides power for the other orbital rings to maintain Eos' orbit.

It is unclear where or how the Thaumic Drive works even though the external ring is visible in many places. It is also unclear how this spinning translates to the other orbital rings. The current proposed method is through the use of Faux Pylons to thaumically accelerate the micro-black holes within the other rings. If this is true, this would be the largest scale Faux Pylon within Cosmoria. Others hypothesize that the outermost ring is a generator which can then transmit the power to the other rings through more conventional means.

Geography

Major Seas

Eos has two trillion bodies of liquid, water or otherwise, on its surface that are larger than one hectare in area. Seas are defined as bodies of liquid with areas greater than half a percent of Eos' total surface. The "Dark Side of Eos" has its own seas, but the largest ones generally mirror the below seas albeit with lower volumes.

Name	Surface Area	Percentage of Eos Occupied	Composition
Isochron Sea	2.83 Trillion km2	8.05%	Water
Sensen Sea	2.51 Trillion km2	7.14%	Water
Etoile Sea	2.40 Trillion km2	6.82%	Water
Platinum Sea	1.60 Trillion km2	4.55%	Water
Ka'a Sea	478 Billion km2	1.36%	Water
Boreal Sea	432 Billion km2	1.23%	Water
Framboise Sea	295 Billion km2	0.84%	Water
Superboreal Sea	239 Billion km2	0.68%	Brine
September Sea	228 Billion km2	0.65%	Lead

Political Divisions

For the past 40 millennia, Eos has been "united" under a single government, whether it was the Dominion of Astraeus or the Greater Martial Consilium. Regardless, it is divided into dozens of nations that are more or less self-governing but possess no official sovereignty. Below is a list of first-level divisions on Eos.

Flag	Name	Area	Population	Type
	Drusidia (Federal Territory of Drusidia)	27.4 million km2	501.3 billion	Federal Territory
	Tenshi (Palatinate of Tenshi)	720 billion km2	97.5 billion	Palatinate
	Vrch (Duchy of Vrch)	63.9 million km2	30.5 billion	Duchy
	Sagittarium (Fort Abedayo)	30 thousand km2	20 million	Military Base