Little is known about Vexxtal Crystals or their origins. They are generally only found in the lightsabers of dark side of the Force users. A corrupting aura is left on those wounded by lightsabers with this crystal.
An interview with W. Haden Blackman indicated that this crystal is all that's left of "Force Plague," a power cut from the final version of The Force Unleashed.
An interview with W. Haden Blackman indicated that this crystal is all that's left of "Force Plague," a power cut from the final version of The Force Unleashed.