Medusa Siege Gun

Kiss your fortress walls goodbye.
This article is about the Imperial Guard artillery piece. For the cannon carried by this artillery piece, see Medusa siege cannon. For the mythical character (and other things called Medusa), see Medusa.

The Medusa Siege Gun also known as "The Testical Gun, Adrews Bane, The Big Bangy Thing" is a self-propelled artillery piece consisting of a Medusa siege cannon mounted in a Chimera chassis. It is used by the Imperial Guard to breach and collapse fortifications and buildings. Rather than lob shells up and over fortress walls, the Medusa shoots right at them with tremendously powerful penetrating egg shells.

The combination of large shells fired at low trajectories leaves the Medusa in the unfortunate position of having the short range of a direct-fire weapon and the relatively light armor of self-propelled artillery. It needs to be escorted within spitting distance (relative to other artillery pieces) of the fortification to be destroyed, which means that the entire surrounding region must be secured (though this is not impossible for the Guard). The large size of the Medusa's shells restrict it from carrying more than 18 at a time; though one is enough to flatten almost any structure, it still restricts the Medusa to operating where supply lines are firmly established and well-defended.

Because the Leman Russ Demolisher can fire egg shells that are just as powerful (though slightly shorter-ranged) while being better armored and carrying more ammunition, armies in the 41st millennium keep their Medusas as reserve weapons and avoid deploying them as much as possible. Attempts to re-purpose the Medusa have not been successful -- it does not have the range to be true artillery, and it is too lightly armored to support infantry at the front lines. Apparently the idea of changing its munitions to be similar to Demolisher sea shells or even a Baneblade-cannon round's rockets has not occurred to the Mechanicus. If it did, though, whoever was stupid enough to mention it would probably be executed for heresy.


The fully-enclosed Armageddon-pattern Medusa.
Armageddon patternĀ 
The hive world of Armageddon commissioned a special pattern of Medusa with a fully enclosed interior -- not to protect the crew, but to protect the breech and loading mechanisms of the cannon. If there were a cheaper way to accomplish the latter without the former, the Departmento Munitorum probably would have taken it, but fortunately for the Armageddon Steel Legion (and other regiments who use their pattern of Medusa) there wasn't.
Vanaheim patternĀ 
Vanaheim apparently makes gunshields, and only gunshields. That said, they're much better looking than the default curved plate, so the Adeptus Mechanicus keeps them in business (and we keep buying the model from Forge World).


The Medusa siege cannon's default weapon is an S10 AP2 large blast with a range of 36" -- the shortest of the artillery pieces, and shorter-ranged than many cannons available to the Leman Russ Battle Tank, but not problematically so for most regular 40K games. The trade-off is that it fires a higher strength and better AP than any Imperial Guard weapon other than the Deathstrike Missile Launcher, and it can be upgraded to fire 48" AP1 Heavy 1 "bastion-breacher" shells for a few points apiece (they roll 2d6 for armor penetration, though they only use the small blast template) -- in short, what it hits, it will destroy.

In 8th Edition, the Medusa was hurt pretty badly by the move away from blast weapons; it kept the higher strength, but it lost the AP advantage (matching the Basilisk at AP -3), its range got cratered even further by losing its mobility, and the Basilisk will just about always do significantly better owing to its higher average hits. Also, only the Armageddon Pattern and the fixed guns have rules any more. Much like the Deathstrike, the Medusa took a pretty steep fall.

The model was developed by Forge World for Imperial Armour Volume One: Imperial Guard & Imperial Navy, where it was given rules. It became part of the main-line IG army list in the fifth edition codex. Forge World has continued to produce the model as well as conversion kits and variants.

Vehicles of the Imperium of Man
Walkers Dreadnought - Nemesis Dreadknight - Ironstrider Ballistarius
Onager Dunecrawler - Penitent Engine - Sentinel - Sydonian Dragoon
Transports Chimera - Crassus Armored Assault Transport - Drop Pod - Goliath Truck
Gorgon Armored Assault Transport - Hades Breaching Drill - Immolator
Pegasus AAV - Razorback Transport - Repressor - Rhino Transport - Taurox - Testudo
Trojan Support Vehicle - Triaros Armoured Conveyer - Tunneling Transport Vehicles
Atlas Recovery Tank - Achilles Ridgerunner - Bane Wolf - Bike Squad - Centaur Utility Vehicle
Cyclops Demolition Vehicle - Devil Dog - Hellhound - Land Crawler - Pegasus AFV
Salamander Reconnaissance Tank - Scylla Light Tank - Siegfried - Tauros - Venator - Wolfquad
Caladius Grav-Tank - Krios Battle Tank - Land Raider - Leman Russ Battle Tank - Predator
Ragnarok - Sabre Tank Hunter - Sicaran Battle Tank - Spartan Assault Tank - Vindicator
Ordnance Basilisk Artillery Gun - Colossus Bombard - Deathstrike Missile Launcher
Exorcist - Griffon Heavy Mortar Carrier - Hunter - Hydra Flak Tank
Manticore Launcher Tank - Medusa Siege Gun - Rapier Armoured Carrier
Stalker - Thunderfire Cannon - Whirlwind - Wyvern Suppression Tank
Baneblade - Capitol Imperialis - Cerberus Heavy Tank Destroyer
Fellblade - Leviathan - Macharius Heavy Tank - Macrocarid Explorator
Malcador Heavy Tank - Mastodon - Ordinatus - Typhon Heavy Siege Tank
Skimmers Javelin Attack Speeder - Grav-Rhino - Land Speeder - Pallas Grav-Attack
Flyers Archaeocopter - Caestus Assault Ram - Corvus Blackstar - Fire Raptor - Nephilim Jetfighter
Sky Talon - Space Marine Landing Craft - Storm Eagle - Stormbird - Stormhawk
Stormraven - Stormtalon - Stormwolf - Thunderhawk - Valkyrie - Vendetta - Vulture
Fighters &
Avenger Strike Fighter - Lightning Fighter - Marauder Bomber
Stormfang - Thunderbolt Fighter - Xiphon Interceptor
Spacecraft Aquila Lander - Arvus Lighter - Boarding Torpedo - Devourer Dropship
Faustus Interceptor - Fury Interceptor - Shark Assault Boat - Starhawk Bomber
Tetrarch Heavy Lander
Titans Imperial Knight - Warhound Scout Titan - Reaver Battle Titan
Warlord Battle Titan - Warbringer Nemesis Titan - Emperor Battle Titan
Forces of the Imperial Guard
Command: Commissar - Enginseer - Imperial Guard Command Squad - Ministorum Priest
Primaris Psyker - Regimental Advisors - Tank Commander
Troops: Armoured Fist Squad - Infantry Squad - Field Chiurgeon - Heavy Weapons Squad
Militarum Veteran Squad - Ogryn Squad - Penal Legion - Psyker Battle Squad
Ratling Squad - Rough Rider Squad - Special Weapons Squad - Stormtrooper
Transports: Aurox Armoured Transport - Argoran Armoured Transport - Chimera
Crassus Armored Assault Transport - Gorgon Armored Assault Transport
Hades Breaching Drill - Hellbore - Mole - Taurox - Termite - Testudo
Trojan Support Vehicle - Pegasus AAV
Light Vehicles: Atlas Recovery Tank - Bike Squad - Bane Wolf - Centaur Utility Vehicle
Cyclops Demolition Vehicle - Devil Dog - Hellhound - Land Crawler - Scylla
Salamander Reconnaissance Tank - Sentinel - Siegfried - Tauros - Venator
Pegasus AFV
Tanks & Ordnance: Basilisk Artillery Gun - Carnodon - Colossus Bombard - Deathstrike Missile Launcher
Griffon Heavy Mortar Carrier - Heavy Quad-Launcher - Hydra Flak Tank
Leman Russ Battle Tank - Manticore Launcher Tank - Medusa Siege Gun
Ragnarok - Wyvern Suppression Tank
Superheavy Vehicles: Baneblade - Capitol Imperialis - Leviathan - Macharius Heavy Tank
Malcador Heavy Tank
Flyers & Bombers: Avenger Strike Fighter - Lightning Fighter - Marauder Bomber
Thunderbolt Fighter - Valkyrie - Vendetta - Vulture
Forces of the Lost and the Damned
Command: Apostate Cardinal - Chaos Champion - Renegade Command Squad
Renegade Demagogue - Renegade Enforcer - Rogue Psyker
Human Troops: Cultist - Disciple Squad - Pontifex Guard - Renegade Infantry Platoon
Renegade Marauder Squad - Renegade Support Squad - Negavolt Cultist
& Beasts:
Beastmen Attack Squad (Khorngors - Pestigors - Slaangors - Tzaangors)
Chaos Beast - Chaos Hound - Chaos Spawn - Mutant Rabble
Ogryn Brute (Ogryn Berserker - Plague Ogryn) - Plague Zombie
Vehicles: AT70 Reaver Battle Tank - AT83 Brigand Super Tank - Chimera - Hellhound
Leman Russ Battle Tank - Salamander Command Vehicle - Stalk Tank - Sentinel
STeG 4
Artillery: Basilisk Artillery Gun - Colossus Bombard - Griffon Heavy Mortar Carrier
Hydra Flak Tank - Minotaur Artillery Tank - Medusa Siege Gun
Rapier Armoured Carrier - Wyvern Suppression Tank
Daemon Engines: Blight Drone - Blood Slaughterer - Brass Scorpion - Lord of Skulls - Plague Hulk
Super Heavies: Baneblade - Macharius Heavy Tank - Malcador Heavy Tank - Valdor Tank Hunter
Flyers: Arvus Lighter - Hell Blade - Hell Talon - Valkyrie