Constellations are powerful upgrades available only to the People of the Stars. The exact constellation gained depends on which 4 Dragon Traits were used to complete a row or column on their survivor record sheet. For example, a survivor who triggers the event by having the Oracle's Eye ability, the Unbreakable fighting art, 3+ strength, and 9+ courage, gains the Goblin constellation.
Survivors can only have one constellation. Once a survivor has gained a constellation, they no longer record new Dragon Traits on their record sheet. If a survivor would gain two or more constellations at the same time, they choose which of them to gain.
The settlement can have multiple survivors with the same constellation. For example, a survivor with the Sculptor constellation that is alive within the settlement, does not prevent additional survivors gaining that constellation.