Rarity

The Rarity Index: How We Decide Which Worlds Are Legendary

8 April 2026 · 3 min read

Of the 120 fictional worlds in the Space Estate catalogue, only 10 are Legendary. That is 8.3%. If your certificate is assigned one, you will know immediately — the gold treatment gives it away before you have even read the name.

But rarity is not just a number. We did not pick 10 at random and label them gold. Each Legendary world satisfies three criteria: cosmologically unusual, lore that stands alone, and a visual identity that would feel wrong if it sat in the Common tier.

Void worlds are the most extreme example. They are dark, ringed in energy, and described with language that borders on unsettling. Revealing one feels different. That is intentional. Twin-sun systems made the list because a planet lit from two directions is immediately striking — no one sees that certificate and thinks it is ordinary.

This matters because Space Estate is a gift experience, not a legal property registry. The rarity tier adds ceremony to the reveal. It gives the recipient something to compare, talk about, and remember, while the certificate stays clearly symbolic and fictional.

We also do not rebalance the catalogue every week to chase artificial scarcity. The 10 Legendaries are fixed within this collection. No bait-and-switch odds, no sudden flood of gold-tier worlds. The distribution you see is the distribution the certificate experience is built around.