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.

• 1 slot allowing Upgrades of type Blaster Weapon TargettIng Enhancement - I, Blaster Weapon TargettIng Enhancement - II, Blaster Weapon TargettIng Enhancement - III, or Blaster Weapon TargettIng Enhancement - IV
• 1 slot allowing Upgrades of type Blaster Weapon Enhancement - III, Blaster Weapon Enhancement - IV, Blaster Weapon Enhancement - I, or Blaster Weapon Enhancement - II
• 1 slot allowing Upgrades of type Blaster Weapon Upgrade - I, Blaster Weapon Upgrade - II, Blaster Weapon Upgrade - III, or Blaster Weapon Upgrade - IV