At the heart of every Jedi lightsaber is a kyber crystal found on several planets, most notably the icebound caves of Ilum. This crystal is attuned to the Force, and connected to a Jedi Knight on a deeply personal level. In this way, a lightsaber is an extension of a Jedi's Force awareness. Because Jedi let the Force guide their selection of the crystal, the vibration that the crystal creates in the lightsaber blade helps Jedi center themselves and find balance in the Force. In this way, a Jedi can center his or her attention beyond the distractions of combat. A lightsaber crystal is colorless until first attuned and connected to a Jedi -- at which times it glows either blue or green, or in some rare instances, another shade. From that point on, it retains that hue.
An impulsive Jedi youngling, Petro had a fiery competitive streak that sometimes rubbed his fellow students the wrong way. He was a young boy during the Clone Wars, when the Jedi Knights were overextended fighting in the galactic conflict to protect the Republic. Because the Jedi Order needed a new generation of Jedi Knights, it was important that he undergo a crucial Jedi ritual known as The Gathering. On the frozen world of Ilum, Petro had to seek out the crystal that would become the heart of his lightsaber. He longed to construct his Jedi weapon, and become a new legend in the history of Jedi warriors.
The Crucible was an ancient Jedi vessel, dating back to the days of the Old Republic. For centuries, it ferried Jedi students from Coruscant to the sacred world of Ilum, where the pupils would undergo the Jedi ritual known as The Gathering. Once a Jedi youngling uncovered a kyber crystal on Ilum, he or she would spend the return trip learning how to assemble a lightsaber. The children would learn from the ancient, wise architect droid, Huyang.
This band of space pirates haunts the shipping lanes of the lawless Outer Rim Territories, in search of cargos to steal and travelers to hold for ransom. They have prospered just enough to maintain a stronghold on a sulfurous world, where they keep stores of grog, food, and other comforts. During the ongoing Clone Wars, the pirates attempted to remain neutral lest they get too drawn into an unprofitable conflict.
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.