Eithlinn
Eithlinn is a habitable moon in Aylathiya. The moon is the homeworld of the Dotsk and is the capital and most populated natural body in Dotskgard. It orbits the gas giant Tuirne, the only world in the Medb system. Tuirne's massive size and host of moons more than make up for the lack of other planets. The brighest star in Eithlinn's sky is not its dim brown dwarf of a sun but the giant aurora star Mili.
Eithlinn itself has a population of thirty billion, making it the most populated moon in Aylathiya. Accompanying it are over forty other moons, the largest of which is Anamnesis, the first world the Dotsk terraformed.
History
Geography
The Dotsk have entirely rearranged Eithlinn's surface, leaving little in the way of natural land forms. While much of the planet remains lush and grand forests cover more area than ever before, this land is reclaimed from ancient cityscape. In the past, Eithlinn's cities were far more spread out and the planet was an ecumenopolis.
Across the moon are large towers, often twenty kilometers long and a kilometer and a half wide. Whether stretching deep into the mantle or the seas, these towers hold as many as one billion within. Several have their own dedicated space elevators to make space travel much easier, mostly for importing crops and materials. Eithlinn's surface, while not pristine, is mostly fallow. The other moons around Tuirne thus supply most of its resources and, even if the moon were fully utilized, there is so little easily-accessible ore left that it would be a wasted effort.
Biosphere
The life on Eithlinn is mostly based on metal oxides and heteropolar acids, different from carbon-based life but fulfilling the same roles. The lack of phosphorus in the area made it far too uncommon for life to incorporate it into their biologies, so life evolved with arsenic as the backbone of its genetic material instead. This caused phosphorous to become a valuable commodity to the ancient Dotsk, a material rivaling gold in value.
Producers
The large volumes of Hydrogen Sulfide present in the atmosphere, in addition to a large amount of carbon dioxide, methane, and sulfur dioxide, are vital to life on this moon. Eithlinn is distant from the nearest star. Instead, the lowest level of the food chain relies heavily on chemosynthesis. Hydrogen Sulfide and Carbon Dioxide can be oxidized to produce sugars, releasing large amounts of pure sulfur. Most organisms that chemosynthesize end up becoming purple or yellow due to this release of elemental sulfur.
A large portion of the moon's biosphere relied on another exotic form of energy production, radiosynthesis. In the ocean, where life on the moon originated, the first meter of water absorbs almost all radiation hitting the moon. On land, however, the moon was often bombarded with high-energy waves. Every so often, particularly strong bouts of stellar radiation will hit Eithlinn. This first sterilized the land; however, life soon began to use this radiation to its advantage. The first "plants" emerging onto the land would mostly chemosynthesize like everything else. Additionally, these plants were able to evolve into radio-synthesizers when the moon becomes saturated with cosmic rays for up to a week at a time. Radiosynthesis is akin to photosynthesis, except it uses higher energy light than photosynthesis does, allowing for elemental oxygen to begin building up in the atmosphere.
Economy
When Eithlinn first became a part of the wider economy of Aylathiya, its economy had no specific focus. The Dotsk developed a system similar to distributism, a system of economics in which the ownership of capital is spread widely among many individuals. A typical company would be owned by those who worked for it; however, the government was not allowed to interfere in the economy unless it was to maintain the distributist system. This economic system was strange, neither fully socialist nor liberal and also far more productive than the feudal systems around it.
At first, the government of Eithlinn was incredibly hostile to corporations. The Dotsk immediately look upon this foreign concept with disdain. Most believed it to be some form of authoritarianism. After the collapse of the Triumvirate Civilization, the planet found itself able to access the large number of resources it was cut off from previously. The government, fearing monopolies, banned corporations and forced them to return to the distributist form the nation had known previously.
Fairly ideologically similar to the Confederacy of Borealis, ten percent of the economy came under the control of this galaxy-spanning union. The Confederacy, known for economically conquering worlds if given the chance, is blocked from expanding much beyond this ten percent figure.