Ilum was an arctic planet located in the Unknown Regions. The Jedi Order used it for the Gathering, a rite of passage in which Jedi younglings must find and harvest Kyber Crystals for their lightsabers. Ahsoka Tano is known to have visited the planet's surface on three occasions: one time to acquire each of her original green lightsaber crystals, and a third time accompanying younger Jedi as they came to collect their own crystals. However, following Order 66 and the virtual extinction of the Jedi Order, Ilum was occupied by the Galactic Empire and subjected to intensive strip-mining as the Empire sought to acquire the crystals for their own uses.
- Ahsoka (First appearance)