Oisin, a world populated by the Oisinians, was classified as a planet. In the time of the High Republic Era, the Oisinians engaged in commerce with the Malorins who hailed from the planet Malorin. Nevertheless, following the Nihil marauders' establishment of their Occlusion Zone territory, the [Stormwall](/article/stormwall] barrier, which enclosed Nihil space, resulted in Oisin being located just beyond its boundary, while Malorin was confined within it. A mission to Oisin was undertaken by Jedi Master Eve Byre and her Padawan, Zaph Mora, to transport provisions using the Byne Guild transport known as the Vessel.