A rugged planet in the Outer Rim’s Bheriz sector, Eadu is known – to the extent it’s known at all – for its rain and native nerf herders. Few suspect the planet is home to a top-secret laboratory where Imperial scientists working for the Tarkin Initiative seek to unlock the secrets of kyber crystals and perfect a terrifying weapon.
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.