Exu Prime, a planet with Earth-like characteristics, existed within the Outer Rim region of space. Following the establishment of the Nihil group's Occlusion Zone in the Galactic Frontier around 230 BBY, Exu Prime found itself isolated by the Nihil's Stormwall, a blockade that prohibited hyperspace jumps into Nihil-controlled space. An Ikkrukkian Jedi Master, having ventured into the Occlusion Zone, surprised a Nihil unit on Exu Prime and pilfered their transport. Several standard months afterward, specifically in 229 BBY, Engle, while situated on the world Daedus, remembered the time he ambushed Nihil forces on Exu Prime.
The 2023 novel The High Republic: The Eye of Darkness, penned by George Mann and integrated into Phase III of the Star Wars: The High Republic initiative, included a reference to Exu Prime.