Spartan Assault Tank

Spartan and proteus.jpg
Note the size of the Marines next to the tank.

The Spartan Assault Tank is a massive vehicle used by Space Marines. It is the "big brother" of the Land Raider line, having roughly the same shape but built to a massive scale; it is as tall and wide as the Land Raider Proteus while being longer, and larger in all dimensions than the standard "Phobos"-pattern chassis. In that chassis, the Spartan can carry 25 Marines (more than twice as many as most Land Raider patterns, and in fact more than any Imperial vehicle other than the super-heavy Gorgon Armored Assault Transport, CRASSUS ARMORED ASSAULT TRANSPORT, Mastodon and Stormlord) in almost perfect safety before unleashing them on the enemy. That's an emphasis on Marines -- even during the Great Crusade, when Land Raiders were plentiful enough to be used by the Imperial Army, the Spartan was strictly Marines- and Mechanicus-only. Even during the Imperium's golden age, the Spartan was just too expensive for mass production, and in the grim, dark future of the 41st Millennium, the only Spartans around are relics of that era.

Fortunately, Spartans are incredibly long-lasting. They have AV14 all around and five hull points -- if they were any more durable, they would have to be classified as super-heavies (and in fact, two vehicles built on the Spartan chassis, the Cerberus Heavy Tank Destroyer and Typhon Heavy Siege Tank, are super-heavy tanks). Its weaponry is similarly up-scaled from the Land Raider, with a twin heavy bolter (which can be exchanged for a twin heavy flamer instead) a pair of quad lascannons for vehicle destruction that can be swapped out for laser destroyers if it needs to go hunting superheavies, and options for a pintle-mounted storm bolter, twin-linked bolters, heavy bolter, heavy flamer, multi-melta, Hunter-killer Missiles, and a Havoc Missile Launcher. For the times when even AV14 on all sides isn't enough, it can also take armored ceramite to make it melta-proof and a flare shield that causes most frontal attacks to dissipate harmlessly. Needless to say, it's considered a must-have for any self-respecting Horus Heresy legion list.

Funnily enough, the original Land Raider, back in the Rogue Trader days, had an extended hull variant called the "Land Raider Spartan", but Forge World decided that a longer Proteus wasn't impressive enough and scaled the whole thing up, hull, tracks, even the sponson guns were doubled up, and adding the assault ramp nose of the modern Land Raider.

While it shares the name with a certain someone, it has nothing to do with Master Chief. Though either through careful planning or a stroke of luck, the rules for the Spartan can be found on page 117 of the Imperial Armour book it appears in.

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
Razorback Transport - Repressor - Rhino Transport - Taurox - Testudo - Pegasus AAV
Trojan Support Vehicle - Triaros Armoured Conveyer - Tunneling Transport Vehicles
Light
Vehicles
Atlas Recovery Tank - Bane Wolf - Bike Squad - Centaur Utility Vehicle - Scylla Light Tank
Cyclops Demolition Vehicle - Devil Dog - Hellhound - Land Crawler - Achilles Ridgerunner
Salamander Reconnaissance Tank - Siegfried - Tauros - Venator - Wolfquad - Pegasus AFV
Battle
Tanks
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
Superheavy
Tanks
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 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 &
Bombers
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 Codex Compliant Astartes
Command: Apothecary - Brother-Captain - Brother-Sergeant - Chaplain - Chapter Master
Command Squad - Honour Guard - Librarian - Techmarine
Troops: Assault Squad - Centurion Squad - Chapter Serf - Devastator Squad
Scout Squad - Tactical Squad - Terminator Squad - Veteran Squad
Transports: Drop Pod - Land Raider - Mastodon Heavy Assault Transport
Razorback Transport - Rhino Transport - Spartan Assault Tank - Termite
Vehicles: Bike Squad - Dreadnought - Javelin Attack Speeder - Jetbike - Land Speeder
Predator Tank - Sabre Tank Hunter - Sicaran Battle Tank - Vindicator
Ordnance: Hunter - Rapier Armoured Carrier - Stalker - Thunderfire Cannon - Whirlwind
Flyers: Caestus Assault Ram - Fire Raptor - Landing Craft - Storm Eagle - Stormbird
Stormhawk - Stormraven - Stormtalon - Thunderhawk - Xiphon Interceptor
Superheavy Tanks: Cerberus Heavy Tank Destroyer - Fellblade Super-Heavy Tank
Typhon Heavy Siege Tank
Spacecraft: Battle Barge - Strike Cruiser
Allied Space Marines: Fallen Angel - Primaris Marine - Blood Angels - Dark Angels
Deathwatch - Grey Knights - Space Wolves
Forces of the Traitor Legions of Chaos
Leaders: Chaos Champion - Chaos Lord - Daemon Prince - Dark Apostle - Master of Execution
Sorcerer - Warsmith - Master of Possession - Lord Discordant
Unaligned: Chaos Chosen - Chaos Raptors - Chaos Spawn - Chaos Terminators - Cultist - Havocs
Mutilators - Obliterators - Possessed - Tech-Assassin - Warp Talons - Warpsmith
Negavolt Cultist - Greater Possessed - Dark Disciple
Faction Aligned: Berserkers - Berserker Dreadnought - Plague Marines
Noise Marines - Sonic Dreadnought - Rubric Marines
Vehicles: Bike Squad - Chaos Dreadnought - Dreadclaw Assault Pod - Kharybdis - Helbrute
Infernal Relic Predator - Land Raider - Mastodon - Predator Tank - Rhino Transport
Sicaran Battle Tank - Stalk Tank - Vindicator - Typhon Heavy Siege Tank
Spartan Assault Tank - Rapier Armoured Carrier - Whirlwind Scorpius - Termite
Cerberus Destroyer - Fellblade
Flyers: Harbinger - Hell Blade - Hell Talon - Doomfire Bomber - Swiftdeath Fighter
Fire Raptor - Storm Eagle - Xiphon Interceptor - Thunderhawk - Stormbird
Titans: Daemon Knights - Chaos Emperor Titan - Feral Scout Titan
Ravager Battle Titan - Chaos Warlord Titan - Woe Machine
Unaligned
Daemon Engines:
Decimator - Defiler - Death Wheel - Forgefiend - Heldrake
Maulerfiend - Soul Grinder - Wirewolf - Venomcrawler - Helstalker
Daemon Engines
of Khorne:
Blood Reaper - Blood Slaughterer - Brass Scorpion - Cauldron of Blood - Death Dealer
Doom Blaster - Kytan - Lord of Skulls - Skull Reaper - Tower of Skulls
Daemon Engines
of Nurgle:
Blight Drone - Contagion - Foetid Bloat-Drone - Myphitic Blight-Hauler
Nurgle Plague Tower - Plague Hulk - Plagueburst Crawler
Daemon Engines
of Slaanesh:
Hell-Scourge - Hell-Knight - Hell-Strider
Questor Scout Titan - Slaanesh Subjugator
Daemon Engines
of Tzeentch:
Aether Ray - Doom Wing - Fire Lord of Tzeentch
Mirrorfiend - Silver Tower of Tzeentch - The Auruntaur
Auxiliaries: Chaos Daemons - Death Guard - Thousand Sons - Fallen Angels