Located in the Outer Rim’s Raioballo sector, Lah’mu is a sparsely inhabited backwater whose rich soil and groundwater are contaminated by minerals and other elements. The Erso family fled to Lah’mu from Coruscant, hoping to find refuge from the Empire.

When the Ersos decided to break with the Empire, Saw Gerrera facilitated the purchase of a 65-hectare farm on the eastern side of the distant planet Lah’mu. On this world far from the centers of power, Galen and his family have reinvented themselves as subsistence farmers, hoping to escape from Director Krennic and his hunters.

Lah’mu has abundant water, but tephra ejected by the planet’s volcanoes contains minerals that make its groundwater unpleasant to drink. The Erso homestead uses GX-8 condenser units manufactured by Pretormin Environmental to distill water vapor from the air and store it for later use.

A brilliant scientist, Galen Erso was coerced into using kyber crystals to enhance energy yields – work his friend Orson Krennic then weaponized to create the Death Star’s superlaser. Galen fled to remote Lah’mu with his family, but Krennic tracked him down and forced him to resume his work. Trapped, Galen seeks to build a fatal flaw into the Death Star and reveal it to the Alliance.

A geologist with an extensive knowledge of crystals, Lyra Erso helped her husband Galen with his work before he became involved with Orson Krennic’s energy-enrichment project. Deeply suspicious of both Krennic and the Empire, Lyra believed in the Force and tried to share her faith with her daughter Jyn. When Krennic tracks the Ersos to Lah’mu, she risks everything to protect her family.

Putting behind a checkered past by lending her skills to a greater cause, Jyn Erso is impetuous, defiant, and eager to bring the battle to the Empire. Used to operating alone, she finds higher purpose by taking on a desperate mission for the Rebel Alliance.