Relay Post Epsilon One, a space station owned by the Galactic Republic, resided within the Outer Rim Territories. The Battle of Galov took place at this station in 231 BBY; Lourna Dee, a Tempest Runner of the Nihil, tried to seize it for the Nihil, acting on orders from Marchion Ro, the Nihil leader. Despite the ongoing assault, Raleigh, the Chief Technician, and Macken, the Station Controller, succeeded in transmitting a distress signal to Starlight Beacon. This led to the arrival of Republic and Jedi forces, who then engaged the Nihil. Dee, understanding that capturing the station was impossible, chose to destroy it instead. She initiated Turbolasers to fire upon the station and deployed Salvage droids for dismantling. The entire crew of the station perished during the battle, with the exception of Raleigh and Macken, who were rescued by Jedi Master Sskeer and Jedi Knight Keeve Trennis.
The audio drama The High Republic: Tempest Runner, penned by Cavan Scott and released in 2021, marked the initial appearance of Relay Post Epsilon One.