The Basilisk is the standard mobile artillery piece of the Imperial Guard in the 41st Millennium, and is also the most common artillery piece used by the Imperial armed forces across the galaxy. The Basilisk is produced in vast numbers on all of the known Forge Worlds in the Imperium, and almost every Imperial Guard regiment maintains several in their arsenal. The Basilisk uses the same versatile and rugged chassis used by the Chimera armoured personnel carrier, and retains all of its features with the exception of its troop compartment, which is replaced with the Basilisk's main gun and gunnery platform. There are several different patterns of Basilisk tanks produced on different Forge Worlds, such as the Armageddon and Vanaheim Patterns, which offer enclosed crew compartments to help protect the gunnery crew from small arms fire. A Basilisk with an enclosed crew compartment is incapable of firing as far as the open-topped version, due to the recoil restrictions of the enclosed crew compartment.