The T261 ''Lucifer'' Arm-Mounted Gatling Gun was a heavy machine gun mounted on the HRUNTING/YGGDRASIL Mark I Prototype Armor Defense System. It fired 20mm high explosive rounds and was six barreled. A rather large-barreled grenade launcher was mounted on top of the arm turret, and it came with a alternate-hand grip stabilizer that ensured pinpoint accuracy.