The Ren Arm Cannon is a sinister, hodgepodge two-barrel multi-purpose cannon mounted on the user's forearm that features forward handgrip and trigger selector for operation. The upper barrel is an air-cooled rapid-fire repeating laser cannon, which can also be used to launch heavier duty physical plasma bolts that are hand-fed into a receiver using the user's Blasters skill. A separate trigger primes these bolts, so that the next trigger-pull releases it. The lower barrel is a piezoelectric flame projector using the user's Miscellaneous Weapons skill. One such weapon was used by Cardo, one of the Knights of Ren.