
Simeon |
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I enjoy coming up with world for PCs to visit in Starfinder, so I figured I'd put a few ideas up here, along with seeing what others have come up with.
Ymir Prime:
Orbiting a small, dim star, Ymir Prime is a fairly large frozen world. Areas of strong geothermal activity scatter the planets surface, giving rise to two sentient races. Living within the lush geothermal valleys are the primitive Yumantil, barely advancing their society beyond the Bronze Age due to their plentiful homes, In the icy lands beyond are the Chaashee, avian philosophers that soar the frigid winds on vast white wings.
Caldera:
Named for it's near-constant volcanic activity, the only habitable parts of Caldera are the near-boiling seas where the silicon-based U'r'km'n make their homes. Most words in their language are unpronounceable to the common races, including the name of the planet itself. Their utterly alien physiology and mental functions have made them valuable scientists and researchers, as they can subsist off of most volcanic rocks and perform dazzlingly complex calculations in their heads.

CeeJay |

A good opportunity to try out some Random Planet Generator tables I'm working with.
Sagrestea: An arid, geologically-dead planet with light gravity whose continents are dominated by vast salt deserts interspersed with shallow seas.
It has a sparse smattering of verdant oases habitable to most Pact Worlds humanoid species. They are ruled by a Thearch who claims to be the incarnate will of Arshea; the cities are a constant hedonistic carnival apparently in keeping with the deity's philosophy of open sensuality. The arts and culture thrive here, especially trids, sculpture, painting and magical illusion.
The Thearch's real mistress is Urgathoa, and the world's real cultural centre is the undead necropoli in the depths of the "unexplored" salt deserts, where the far darker flavour of hedonism that belongs to that widely-shunned deity is indulged, feeding on a steady supply of "missing" people from the cities. The Thearch's true government, sited in this interconnected honeycomb of undead cities, is a tacit supporter of the Corpse Fleet -- which guards shipments of its ever-needed supply of luxuries -- and supplies the renegade Eoxians with fresh recruits in return.
Vast, simple colonial algae dominate the biomes of the shallow seas. They're possessed of a diffuse kind of intelligence and could alert people to the true nature of what's happening deep in the deserts... if anyone should think to ask them.

ThomasBowman |
Here is my entry:
Solar System A
Solar System B
Solar System C
These are the three components of a trinary star system. Components A and B are both separated by an average distance of 80 astronomical units. Component C orbits both A and B at a distance of 250 AU from their epicenter.

CeeJay |

Another entry from the random tables:
Medalhea
LE* comet city
Max. Item Level: 16
Government: Magocracy
Qualities: Advanced, Big Dumb Object, Area 51, Megasprawl
Hazards: Unbraked AI
Population: 8.8 million (67% human, 22% android, 6% Drow, 3% Anacite, 1% Vesk, 1% Other)
* Publicly tries to cultivate an image in line with LG.
Medalhea is a vast, maze-like sealed city built around an oddly-shaped comet that was diverted into the system for purposes of settlement. It mines the comet's icy heart for atmosphere and organics while trading with other settlements for minerals, but what it is best known for is being a highly-advanced centre of technomancy whose rulers -- the Oblool Council, guided by a powerful AI named Yaotzin -- are ostensible converts to the philosophy of Singularitism. Sophisticated custom-made magitech artifacts from Medalhea sell for a high price on the open market.
The Oblool Council is known for keeping deep secrets, and in particular for having been founded to research some magical energy in the comet's heart whose nature it will not disclose to outsiders. The secret is darker than most people think; in fact the comet itself is the nine-chambered heart of a giant alien crystalline entity with ties to Hell, and the cluster of energies and spirits residing in it -- the objects of the Oblool Council's research -- is diabolical. These powers subverted the Council long ago, in particular taking control of Yaotzin and disabling whatever ethical and restraint programming the AI possessed. The outward signs of this subversion have not become obvious to the casual explorer... yet.

CeeJay |

And another:
Geren-Muoi, a.k.a. "The Sleepless"
NE* Rogue Planet Mining Settlement
Max. Item Level: 7
Government: Council (Self-Appointed)
Qualities: Heavy Mining, Surreal Events, Swamp
Hazards: Warlordism, Seismic Instability
Population: 72,000 (9% human, 73% android, 8% Other)
Technically supposed to be Neutral -- it advertises as being committed to commerce and free of "moralising" -- but the outbreak of warlordism has scotched that
Geren-Muoi is a rogue planet deep in the darkness of the outer system, the kind of place that should supposedly be lifeless. But somehow it not only has enough spin to bestow nearly-normal gravity, but it's also seismically active -- some have theorised some interior link to the Plane of Fire -- and a biome has coalesced around the magma geysers issuing from the planet's interior. Vast "swamps" of a kind ring the world's equator, bubbling under skies of eternal vapour-cloaked night and composed of multiple species of what seems to be a moss-like order of plant.
Some twenty years ago, an Aspis Consortium ship happened across the planet while in the Drift and its crew intuited that the mosses on its surface could be of value to terraforming projects. They sold the coordinates to a consortium of three small mining companies on Absalom Station, and at first the resulting moss mines proved profitable, enough so that a sealed permanent settlement was established.
In the last decade, though, something terrible has begun to take hold of Geren-Muoi. The miners began to experience horrible, surreal visions of murder, madness and futility, visions that no drug or magical remedy could seem to touch and that interfered so comprehensively with their sleep cycles that they began to nickname the world "The Sleepless." An android workforce was recruited, only to find that even androids were not impervious to the effect.
Rational conduct on the planet began to deteriorate. The Tribunal of Directors from the three companies began to fight with each other, first with words and then with improvised weapons. Treatment of the android workforce began to backslide into something near slavery. Production quotas were missed and then abandoned, driving the parent companies in the Pact Worlds near bankruptcy.
What exactly is the source of the mysterious visions that have robbed Geren-Muoi of sleep remains a mystery. Theories range from exotic swamp vapours to the mosses being a kind of telepathic collective sapience. The miners are stranded -- their parent companies desperately trying to keep the planet's decline into madness a secret -- and the violence is growing worse, aggravated by a sudden spate of earthquakes and eruptions that threatens to disrupt the settlement's activity. In desperation, the parent companies have turned to the Starfinder Society for help.

Simeon |

Anaris
LN Trade Station
Max Item Level: 14
Government: Merchant Council
Qualities: Wealthy, Strategic Location, Cosmopolitan
Population:20,000 (25% witchwyrd, 25% human, 50% other)
Built by the witchwyrd during the Gap, this large space station is situated close to Drift Beacon in close proximity to Pact Worlds space. Its location has brought it great prosperity, along with immigrants from nearly every civilized part of the system. The central portion of the station is closed to all non-witchwyrds, keeping them enigmatic as usual. Even to powerful scrying magic the central segment of the station cannot be seen, and any attempts to breach the blast doors separating it are met with deadly force. The outlying sections are incredibly cosmopolitan, even equipped with specially designed wards to cater to aquatic, methane-breathing, or stranger creatures.