#pentrosia

[projecteldritch]

Eldara - future

A far future, post-scarcity setting of a fantasy world.

If the planet is entirely city, where does the oxygen come from?

Floating oxygen farms are used; 1-2 hectare (3-5 acre) platforms hosting a large amount of oxygenating plants and algae, regularly sent into areas where the air is becoming polluted or oxygen levels are falling.

In addition to this, in several places, specialized algae is grown to provide local oxygen. The floating farms don't need to visit these places as often.

Third up, the Aquilans (dryad/elf species) have massive trees in many places, grown and maintained by magic, which also help create enough oxygen.

Does the planet have natural water?

Yes, its oceans are largely intact, their surface host to a more natural variant of the algae used to make oxygen. Natural rivers and lakes have largely been supplanted by artificial ones though.

The floating oxygen farms also create drinkable water by condensing moisture and filtering it.

Nesiidae(species)/Pentrosians(nationality) live in underwater cities, and they utilize advanced magitech to filter water into potable sources. They are able to filter way more than needed across the whole planet, so water prices are more than covered by taxes for everyone.

How deep does the city go?

It starts at ground level with minimal (active) subterranean layers, but the buildings reach far into the sky in denser regions.

Underground is the leftover amalgam of past civilizations' tunnels, sunken cities, natural caves, and creature burrows. It is generally not safe for travel, much less for living, but it can go a few kilometers down.

What is transportation like?

Public transportation is the main form (both on-rail and off-rail trains/maglevs and flying transports), but individual, flying pods are also used. They're for the most part automated so as to avoid driver-induced accidents.

How is food produced?

Replicator technology has been invented and is largely used to create food and other consumer goods directly out of energy. This also helps with waste disposal.

Small, private gardens and farms exist, though they rarely feed more than a few people each.

Are the poles less occupied than the rest of the city?

Yes, and no. The poles were for a very long time uninhabitable for mortals, so a group of gods called the Boreals have made their home there. They've developed their own magitech, raised their own cities, and for a long time, have remained mostly hidden. Now that the world has been connected by technological advancement, they act as a neutral nation, allowing limited immigration.

How about the equator?

The equator has a massive wall-building going around in a band around the planet, utilizing the various civilizations' magitech to stay useful. It's a major transportation line, and has a lot of people living next to it.

Are there parks and protected areas of nature?

The Aquilans' mother trees and their underground fungal farms are all that remain. It is debatable how natural these are, but they host the majority of the biodiversity found on the planet.

Sci-fi worldbuilding ideas for your city planets :)

If the planet is entirely city, where does the oxygen come from? Are their farms dedicated to producing oxygen? Special factories? Are there plants that produce oxygen very quickly all over the planet? Do you have to pay an oxygen tax?

Does the planet have natural water? Are the oceans untouched, incorporated into the city, or have they been drained and the water used for things in the city? What is it used for? Drinking, dams, hydroelectricity, food production, etc?

How deep does the city go? Has the planet been mined into to create more space? Is geothermal energy used? Are the bottom levels reserved for things such as sewage, electricity production, factories, prisons, etc?

What is transportation like? Are there roads, floating roads, or are trains and trams used instead? Are planes used? Is transportation fast enough to quickly travel across time zones?

How is food produced? Is it imported, or is it grown on planet? A combination? Think about greenhouses, factorised farms, vertical farming projects, etc. If oceans are left relatively untouched, is food produced in it? Are fish kept? Are there ration laws?

Are the poles less occupied than the rest of the city? Are they used for storing frozen goods, super computers? On a planet with no oceans, is ice and snow valuable?

The same goes for the equator of the planet. Is it more or less occupied? Is the heat used for anything? Are there solar panel farms? Air conditioning?

Are there parks and protected areas of nature? Ancient gardens, important forests, sacred land? Are there laws about chopping down trees? Are there farms for trees and plants? Are their plant shops, and are they expensive? In Star Wars, a part of Coruscant's highest mountain is a public monument that you can look at - are parts of mountains, rare ores, fossils, etc, preserved?

Not all sci-fi cities look the same. Coruscant has skyscrapers arranged in a very chaotic manner, stretching incredibly deep and incredibly high, and there is almost no plant life or natural parts of the planet to be seen. Xandar is arranged neatly with very similar style buildings whilst remaining relatively low rising compared to other city planets, and has lots of greenery and a fairly untouched ocean. Wakanda is relatively defined in layout, with a mixture of plants and buildings, houses and skyscrapers, with every building being unique. Draw inspiration from whatever you like.

Write whatever you want, even if it's common or cliche. It doesn't matter if it has been done before, because it hasn't yet been written by you.

Happy worldbuilding!