Isolt, a planet of serene landscapes, existed inside the Occlusion Zone controlled by the Nihil marauders during the High Republic Era. In an effort to replicate the event that had annihilated Dalna by causing a volcanic eruption, the Nihil subjected Isolt to relentless bombing. This bombardment obliterated almost all living things on Isolt and resulted in at least one significant volcanic eruption. Following her escape from the world of Naboo, Nihil General Abediah Viess made Isolt her base. Jedi Master Porter Engle, guided by Viess's trail, pursued her to Isolt for a fight.