Ilum

Ilum was a snow-covered planet located in the 7G sector of the Unknown Regions, within the Ilum system. Ilum had a kyber crystalline core, and had been utilized by the Jedi Order for the Gathering, a rite of passage in which Jedi younglings had to find and harvest kyber crystals for their lightsabers, which had existed for thousands of standard years. After the fall of the Empire, its successor state, the First Order, converted the massive trench into Starkiller Base.