Aricho, a planet situated in the Outer Rim, was positioned beyond the Nihil pirates' Stormwall in the Occlusion Zone during the High Republic Era. Following the destruction of Starlight Beacon in 230 BBY, Jedi Padawan Imri Cantaros sought refuge there. In 228 BBY, the aspiring inventor Avon Sunvale discovered that Nihil forces, commanded by the Quarren Kara Xoo, planned to establish a base on Aricho to exploit a precious herb found there; concerned that Nihil General Abediah Viess would also arrive on the world bringing with her Nameless entities that preyed on Force-sensitives, Sunvale embarked on a mission to save her friend.