The universe
Corium isn't a single table that resets. Every star that burns leaves a record behind: its planets, how it died, who ended it. The archive of those stars is the universe the players have built together.
Stars
Only one star is live at a time, and it's where the SOL goes. As it gains mass, it moves through seven visual stages:
| Stage | From mass |
|---|---|
| Protostar | 0 SOL |
| Main sequence | 2 SOL |
| Blue giant | 6 SOL |
| Red giant | 10 SOL |
| Supergiant | 14 SOL |
| Critical | 18 SOL |
| Event horizon | 21 SOL |
A star ends one of two ways: a supernova (someone's push triggers it), or a collapse into a black hole at 21 SOL. Either way, the next star is born straight away.
Each star gets its own seed on-chain, derived from the star before it. That seed decides what its system looks like: which planet sits on which orbit, which worlds get rings or moons, and the tint of the whole system.
Planets
Every nursery feed that lands pulls a world into orbit. The first feed takes the innermost orbit, the second the next one out, and so on across nine orbital rungs. Anyone watching the star sees your planet appear and circle the star for the rest of its life.
Which world you get isn't random at the moment you send. It's decided by the star's seed and the order your feed landed in, so a world is always the same world for anyone who replays that star, forever.
Systems sort themselves like real ones: molten rock close in, giants further out, ice at the edge.
| Family | What it is | Rarity |
|---|---|---|
| Slag | Molten rock, too close to the fire to ever cool. | Common |
| Rock | Airless stone. | Common |
| Rust | Iron dust and a thin red sky. | Common |
| Sand | Dune fields from pole to pole. | Common |
| Ice | Frozen solid, bright enough to see from the star. | Uncommon |
| Gas giant | No surface, bands all the way down. | Uncommon |
| Ice giant | A cold giant in methane blue. | Uncommon |
| Violet giant | A giant with a chemistry nobody has explained. | Rare |
| Terra | Liquid water, cloud, and the only green in the system. | Exotic |
Rings raise a world's rarity by one tier. Rings are handed out per system, not per planet, and 62% of systems get none at all, so a ringed world is a real find.
Remnants
Kill a star and its remnant is yours. Remnants rank as Exotic, the top tier. They're the rarest thing a profile can show, because each star has exactly one killer.
Your atlas
Everything you've created (every world you've seeded and every remnant you've earned) is collected on your profile as your atlas. Your rarest world is shown first. With the ATLAS perk, you can choose which one you wear on your card, on the boards, and next to your name. Ranks & perks →
The WORLDS leaderboard ranks players by how many worlds they've built.
What worlds are, and aren't
Worlds and remnants are derived from on-chain data (the star's seed, and which feeds landed in which order), so anyone can check them and nobody can fake them. They are not tokens or NFTs. You can't sell or transfer them, and they have no monetary value.
The archive
Every past star can be revisited:
- Step back through stars with the arrows next to the star name, or open fast travel by tapping the star name and jump to any star by number.
- Every star has its own link, like
corium.so/star/12. - Replay a star's whole lifecycle with the play button and speed control. Scrub through it, and see where your own pushes landed.
- Read the epitaph its killer left, if they left one.