The most sacred world to the Jedi Order, the ancient planet Ilum is forever encased in ice, and whipped by biting winds. Hidden beneath the frozen surface is a Jedi Temple from the very dawn of the Order. It is here, within the legendary Crystal Caves, that Jedi initiates must undergo The Gathering. The rite of passage, handed down over centuries, requires Jedi younglings to trust their instincts, overcome inner obstacles, and find the unique Ilum crystal that is attuned to their Force presence. Upon retrieving the crystal, a Jedi initiate begins the process of constructing his or her lightsaber, under the guidance of Professor Huyang.
The Jedi Order has existed for centuries, and in that time, it has grown and changed. But some of its most sacred traditions have remained unaltered since its very inception. The Gathering is one of its most revered rituals.
Jedi Master Yoda oversees the training of Jedi younglings before they graduate to the level of Padawan and become apprenticed to an individual Master. Prior to that transition, Yoda supervises The Gathering from within an ancient Jedi Temple on Ilum.
Part of the responsibilities of a Padawan learner is to assist in the training of Jedi younglings. Ahsoka would help bring bright students to the world of Ilum.
The heart of a Jedi lightsaber is powered by an Ilum crystal that is capable of focusing Force energy as part of the creation of the primary beam.
Each lightsaber crystal is uniquely attuned to its owner -- a Jedi initiate must seek out the crystal that speaks clearest to him or her.