Planets within Occupied space are broken down into numerous categories:
Free Worlds refer to planets and their governments, which have a seat of representation on the relations station. These planets can be both natural and artificially created through lost Titan technology of the Old World. Free Worlds possess advanced tech and have the most influence across occupied space.
Outer Worlds refer to the fifty planets spread out along the outer rim of occupied space and controlled by the United Union royal family of Helana. Most of these planets are hellish wastelands of deserts and mountain bedrocks, but all are classified as air-breathing worlds. Inner systems mostly have hot climates with constant red sandblasts. The bulwark worlds surround Helana and are the most hospitable. Technology among the outer worlds is vastly different depending on which planet is visited. Some still use horse and buggy for transportation, not counting the palaces of the thousand princes and princesses who are all direct bloodlines to the first exalted ruler of Helana. Others are more advanced but still not at the same level as the Free Worlds. All fifty outer worlds are artificial.
Rogue Worlds refer to the one hundred and sixty-two air-breathing planets within occupied space that don't fall under the free or outer world categories. Some of them are deserted through self-destruction, wars brought on by the Free Worlds or a byproduct of whatever event caused the Great Darkness. An estimated forty-eight billion people live on these planets, and their technology depends on the world. Some still live in the Years of Forgetting without electricity or running water. Others have basic spaceflight abilities and structured societies. A few are faster-than-light space-faring civilizations but are not advanced enough or accepted by the Free Worlds. They're mostly artificial, with a few well-known natural worlds. Rogue Worlds also have subcategories: Slave Worlds/Colony Worlds/Pirate Worlds.
All listed planets are also put into two categories: natural and artificial world.
Natural worlds formed on their own without Old World technology. These planets tend to be more hostile with alien landscapes and lifeforms.
Artificial worlds were created during the time of the Titans using Old World seed engines to turn planets into former identical representations of Earth before the Great Darkness. Lifeforms also mimic Earth from that time. Some of these planets have unique aspects, like Ardum, which has a flower that grows like a weed and was never something natural to Earth.