The World
A civilisation mastered gene editing and created a new generation of enhanced humans. When financial collapse came, the enhanced were blamed. They were exiled to four distant planets, each matched to a group's mutations.
Your people landed on Kepler-4b — a world so close to its star that exposure to direct sunlight is lethal. A culture built entirely around surviving the light.
A totalitarian Priest class rules through manufactured religion and manufactured ignorance. Then the capital is destroyed — a precision laser strike from the origin planet. They still need a scapegoat.
You were on a surface run when the emergency alert hit. A single waypoint appeared on your radar, labelled only: Archive Relay. Get there. Learn what was hidden. Find a way to contact the other three planets.