d20 Planets

Most names from here: https://donjon.bin.sh/scifi/name/star_wars.html#type=star_wars_planet

1. Eraan: Oceans of liquid diamond dotted with diamondbergs. Diamond-sea equivalents of arctic animals: giant tardigrade polar bears, silicon-based killer whales, etc. Location kept secret since discovery of it would utterly crash the value of diamonds. Scattered harvesting camps maintained by conspiracy that keeps it secret.

2. Samai: Donut-shaped, moon passes through the hole in the middle. Rotates very fast, day only lasts a few hours. Gravity at the poles is more than twice that at the equator. Intense winds, strong storm systems. The inner ring is a frozen wasteland because it gets so little sunlight. Scattered scientific outposts and hidden treasure.

3. Koora: Covered in ruins that form patterns visible from space. Entire planet is a gigantic “book” of rune-shaped ruins. If read correctly, shows location of an ancient treasure. Stranded translator droid who learned the language and is willing to teach it to anyone who rescues them but is trapped inside a dangerous temple complex full of security systems and dangerous wildlife.

4. Stanton’s Hulk: Extremely large, high-gravity. Used as a prison planet. Alternating terrain of plains and rocky piles of mountains. Only the small section on the plains where the prison is located and a few scientific outposts are well-mapped. Hidden colonies of escapees desperately trying to keep their antigravity generators running while still avoiding detection. Massive “catapults” are needed to launch most spacecraft back out to space after they land due to the intense gravity.

5. Rotha: Small, low-gravity, covered in tropical islands. Used as a resort world. Visitors on extended stays must take special supplements or exercise intensely to combat muscle and bone decay. Most popular sport resembles volleyball. Secretly being used as part of a massive money-laundering scheme. Massive zoo of exotic interplanetary animals also used as a way to dispose of bodies.

6. Cazon: Has a massive “bite” taken out of it. Bizarre and highly hostile insectoid life forms and sensor-jamming fog periodically emerge from the pit at the center of the ring of jagged ridges that makes up the “bite”, which has never been fully explored.

7. Cancri: A tidally-locked volcanic planet, pitch-black but still hot on its “cold” side and covered in oceans of molten rock on its “hot” side. The dark side is controlled by a mercenary company who use the planet as a base and training camp and boast about having tested their troops against such a hostile environment.

8. Cousteau-7: Completely covered in land coral, remnants of an ancient terraforming experiment. Will take over any ecosystem it invests unless burned out. The coral has some degree of possibly-sapient collective intelligence, and engineers species to act as symbiotic gardeners and spreaders for itself. Currently “bored”, in whatever way psychic coral can be bored, and has taken to experimenting with increasingly dangerous predatory lifeforms. 

9. Megiddo: Covered in naturally-occurring nuclear reactors. Planet is constantly soaked in intense radiation and these reactors undergo periodic meltdowns that blast massive chunks out of the planet. Orbiting space station of scientific observers. Only settlement is a mobile monastery of monks who believe that living in the direst possible conditions will lead them to the secrets of enlightenment.

10. Gelgo: Due to its orbit, the planet has a single habitable equatorial zone between a region of intense heat and one of cold. This equatorial band moves across the planet as it rotates, so almost all life on the planet is nomadic, including colonists in enormous mobile cities. There are a few environmental domes in the hot and cold zones that can lower their shielding when the equator intersects with them, an event marked by a period of festivals.

11. Corla: Ammonia oceans with small landmasses made mostly of ice, smells terrible. Despite being an unwelcoming place for most species, it has a massive, thriving ecosystem with numerous species. Extremely dangerous to visit due to environmental conditions and local predators. A starship carrying treasure crashed into it and sank in the ammonia ocean and no one has been able to retrieve it, though the treasure is said to have been stored in a secure enough container to leave it intact.

12. Renata: Like Earth, has a wide variety of environments. Each region is dominated by a feuding hive mind, creating a somewhat bizarre political situation. Despite the amount of bodies present across the planet, there are very few individual minds, and the galactic census is somewhat at a loss as to how to count the planet’s population. Each hive is looking for leverage over the others and a way to increase territory. Each hive mind has a limited ability to physically connect to the others, meaning that they rely on deniable outside operators to keep secrets from each other.

13. Dalgiana: Orbited by numerous moons in an erratic pattern whose tidal forces cause massive, unpredictable sea quakes and tsunamis. Known as “Sailor’s Hell”. Location of a triennial extreme sports competition, which always has a spectacular prize. Sabotage and foul play are common during the competition, and simply surviving is a rare accomplishment.

14. Sotev: The surface is almost entirely covered in massive plant-like organisms many miles high, creating a layered jungle inhabited by a wide variety of dangerous creatures. The most dangerous are ant-like hive dwellers who sculpt the jungle’s plant matter into enormous megastructures. The planet’s greatest wealth comes from rare fungi and precious minerals found on the sunless depths of the jungle floor, a marsh of rotting plant matter. Descending to this level is perilous in the extreme.

15. Algarar: The high gravity of its star has stretched it out into a bean-shape and periodically tears chunks out of the planet. The “tear zone” is surrounded by derelict observation facilities left vacant after they became too expensive to maintain. The planet’s surface absorbs instead of reflecting light, leading to an asphalt-black surface. Only permanent residents are darkness-worshipping monks.

16. Lekakalo: The surface of this planet is scorched and scarred, with only a few hardy plants and fungi persisting. It looks like a war zone, but has no native civilizations. Its native wildlife, however, have evolved the ability to create organic explosives, prompting an evolutionary arms race of explosions, breath weapons, armor plating, and other cunning adaptations. These creatures are much prized for their hides, organs, and abilities in fighting pits.

17. Domgri: The surface of this planet is covered in one of the universe’s most dangerous jungles, a constant nightmare of swamps, carnivorous plants, pestilence, and predation under a layer of toxic clouds. However, the atmosphere above the cloud layer is breathable and quite pleasant, and the planet hosts a number of floating cloud cities and artificial floating islands.

18. Lusa: Only a single rocky plateau is inhabitable, the rest is covered in poisonous gas produced by massive fungal forests. Expeditions in sealed enviro-suits and vehicles periodically descend into the fungal zone to search for rare miracle drugs reportedly found deep within the fog.

19. Marka: All terraformed into endless fields, now overgrown. Creepy velociraptor-like predators evolved from scavengers and housepets stalk now-wild livestock through endless fields of towering cornstalks and other crops. Occasionally you can find ruined remnants of city buildings that haven’t been fully broken down and grown over.

20. Uusson: Covered in out of control automatically constructing cities. Entire surface is endless maddening urban sprawl. Slowly expanding into space by devouring its own moon for materials. Inhabited by nomadic scavengers and malfunctioning security robots. Each group of security bots has its own distinct hierarchy of “crimes”, meaning that compliance with one might result in attack by another.