Rizzan is the Drakken Hound under Bane's command. He's very cruel and never kills his victims quickly.

Drakken Hounds were wolves at one time but the demons got a hold of them and mutated them. Their skin is continually rotting, giving it a greenish tinge as well as a vile odor. You can always smell a Drakken Hound before you see it. Their fur also molds and carries its own awful green tint and smell.
Hounds are so dexterious that they can walk without making a sound. Though they are not quick (easily out-runable) they make up for it by being impossible to see or hear. The only way of knowing its there is its awful smell.
Those powerful tendons at its neck and the mass of muscle they surround create a deadly bite. Hounds are capable of crushing bone easily. However, the exposed tendons are its weakest area. Snap one of those and the beast is almost defenseless.
They have an extremely long, hollow tongue that pipes bacterial acid/poison up from the hound's first stomach. The tongue can reach up to 1/2 the beast's length.