Gamestop's exclusive Force Unleashed 2 Collector's Edition includes this:
* Maulkiller Skin - In the cloning facilities of Kamino, Darth Vader created a warrior of unparalleled strength and power by combining the genetic material of Darth Maul, former apprentice of Sith Lord Darth Sidious, with his own apprentice, Starkiller. The resulting aberrant clone possessed traits from both warriors, but the crude fusion of two disparate Force users quickly produced physical and mental instabilities that led to the unfortunate clone’s destruction. For a brief time he struck fear into the hearts of all who faced him, even Lord Vader himself.
* Maulkiller Silver Saber Crystal – The perfect companion to the Maulkiller costume, the silver crystals make his dual lightsabers look like an extension of the silver Zabrac styled tattoos that cover his body and face. This powerful crystal allows the player to consume less Force Energy when using Force Powers so that he can devastate his enemies.