Little was known about Katak Crystals or their origins. They were generally only found in the lightsabers of dark side Force users. Users of this lightsaber crystal managed to drain some of the life force of those within close vicinity. This would not be enough to instantly fatigue the victim, however; prolonged exposure would prove to be fatal.
Behind the scenesEdit
In Star Wars: The Force Unleashed this is a crystal unlocked by finding the Jedi holocron above the highest turbolaser beam in the incomplete Death Star. Equipping the crystal allows some lightsaber attacks to siphon portions of an opponent's remaining health to the player.