Onager Dunecrawler

What happens when you mix a Sentinel with a crab.

The Onager Dunecrawler is an assault walker used by Adeptus Mechanicus Skitarii. Based on technology dated from the Dark Age of Technology, the Onager Dunecrawler is based on the Mars Universal Land Engine (or M.U.L.E.), which in turn was fashioned by famed technoarchaeologist Arkhan Land (Of the Land Raider fame) as a form of transport but was soon modified into a weapon of war. No word on why it's still not used as a transport like a Rhino, a dedicated APC is something the Adeptus Mechanicus seems to lack.

Despite looking like the demented offspring of a Sentinel and a giant crab, the Onager Dunecrawler is significantly more advanced, better armored and better armed. Able to carry a collection of advanced weaponry not seen since the Great Crusade such as a Eradication Beamer, Phosphor Blasters, Neutron Laser, and a coaxial Cognis Heavy Stubber, one must wonder how easy wars would have been fought if the Mechanicus actually decide to export such weapons to the Imperial Guard but alas, it is all wishful thinking. It can also be equipped with an Icarus Array, a powerful anti-air package comprising twin Autocannons, a Gatling Flak Launcher, and Missile Launchers making it a bane to most enemy flyers. Recent technological developments, probably from the big cog himself, also now allow for the Icarus Array to efficiently target any vehicle that dares to propel itself forward without using sanctimonious wheels, treads, or mechanical appendages, much to the ire of those that employ filthy xenos technology.

The Dunecrawler maintains a crew of two fused with their Onager host in a symbiotic relationship similar to that of the Princeps and Moderatii of the Titan Legions. Its gunner is a former Skitarii Ranger that fires the weaponry while the driver is a Skitarii Vanguard, whose augmented body allows him to be resistant to the harmful energies being spewed out; allowing him to immerse himself in an electro-amniotic fluid that allows direct communication with the walker's Machine Spirit....it's similar to the Matrix films really. Treated like expendable living batteries, the crews inevitably die over time and are promptly replaced.

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 Adeptus Mechanicus
Command: Magos (Tech Priest Dominus - Tech-Priest Manipulus)
Troops: Chrono-Gladiator - Combat Servitors - Electro Priest - Enginseer
Kataphron Battle Servitors - Myrmidon - Pteraxii - Secutarii - Serberys Raiders
Servo-Automata - Skitarii - Tech Priest - Tech Thrall - Thallax - Ursarax
Castellan-class robot - Cataphract-class robot - Colossus-class robot
Conqueror-class robot - Crusader-class robot - Scyllax-class robot
Thanatar-class robot - Vultarax stratos-automata
Walkers: Ironstrider Ballistarius - Onager Dunecrawler - Sydonian Dragoon
Vehicles: Chimera - Karacnos Assault Tank - Krios Battle Tank - Land Raider
Macrocarid Explorator - Minotaur Artillery Tank - Rhino Transport
Skorpius Hover Tank - Triaros Armoured Conveyer
Flyers: Archaeopter - Avenger Strike Fighter - Lightning Fighter - Storm Eagle
Other: Galvanic Servohauler - Ordinatus
Titans: Imperator Battle Titan - Imperial Knight - Reaver Battle Titan
Warbringer Nemesis Titan - Warhound Scout Titan - Warlord Battle Titan