Darker
this green, reptilian beast, cloaked in red robes, was the physical manifestation of all the instinctual anger, fear, and hatred that the ancient natives of Arbra drained from themselves. These ancient Arbrans, long extinct at the height of the New Order, had attempted to rid themselves of negative feelings by trapping the negative energies in an underground cavern, kept from escaping by an unusual form of force screen. After these energies reached a certain "critical mass", they coalesced into the being known as the Darker. It lurked on the planet in a sort of hibernation for eons before the Alliance established Haven Base on Arbra. The Darker awoke and realized that the Alliance might have the technology necessary to free itself. Using a mental form of communication, it lured R2-D2 into its underground cavern and captured the droid. The Darker hoped to use its parts, along with the components of C-3PO, to deactivate the force screen and be freed. Chewbacca, who had accompanied C-3PO to locate R2-D2, tried to shoo thte Darker, but was thrown from the chamber. This allowed Chewbacca to voercome the negative thoughts used by the Darker, and the Wookiee returned to face the Darker. Chewbacca found himself aided by a small band of brave Hoojibs, and they managed to overcome the Darker's superior mental strength. C-3PO told Chewbacca that the Darker could be destroyed, and the Wookiee heaved the Darker into the force screen that had once contained it. This disintegrated the Darker, and also brought down the ancient force screen.