Capitol Imperialis

A Capitol Imperialis is a super heavy tracked vehicle often used by the Imperial Guard as a mobile command base for the deployment and organization of multiple regiments. The vehicle is heavily armoured and is protected by multiple Void Shields due its sheer size and slow drive speeds that limit the vehicle to defensive roles during combat situations. The Capitol Imperialis is used by the Imperial Guard during large campaigns where multiple regiments, and possibly other Imperial factions such as the Adeptus Astartes and Adeptus Mechanicus, will be working cooperatively. The Capitol Imperialis allows the highest commanders to meet in a secured place that can move along with the front line. The vehicle is designed as a mobile command post and base of operations, but its heavy armour and armament ensure that if engaged in combat Capitol Imperialis is capable of holding its own.

Design
The Capitol Imperialis is a massive vehicle at nearly fifty meters tall and almost twice as long, rivaling Imperial Titans in size. The machine's outer hull is plated in solid adamantium and the vehicle is outfitted with six Void Shield generators for extra protection. Within its massive hold a Capitol Imperialis can carry up to two full companies of Imperial Guard infantry, and is also capable of carrying tanks. This allows the vehicle to act as a mobile bunker for troops, especially on inhospitable worlds, and the embarked soldiers can further support the Capitol Imperialis by fighting from its protective bulk. The command bridge is situated deep within the vehicle and gives the regiment's commander the tools needed to command his troops efficiently. The bridge features Vox-gear, pict-casters, logic-engines, and a holo-map. The bridge crew mostly consists of hooded Servitors that gather, analyze, and display information to allow the leadership to plan out their campaign.

Armament
The Capitol Imperialis is armed with a wide variety of powerful weapons that allow the vehicle to hold its own against even the most impossible odds. The vehicle's main weapon is a massive Macro Cannon known as a Behemoth Cannon. The Behemoth Cannon is supposedly large enough that four Leman Russ Battle Tanks are capable of fitting in its barrel. The concussive force of firing the weapon can knock nearby troops off their feet and cause avalanches and rock slides, while a direct hit is capable of killing thousands of enemy soldiers or vehicles, and is capable of throwing them hundreds of meters into the air while producing a massive mushroom cloud. Secondary hull-mounted weapons include twin-linked Heavy Bolters for close-in defensive fire, and the outer hull can be electrically charged to repel boarders.

Tarsis Ultra Campaign
When a tendril of Hive Fleet Leviathan threatened the world of Tarsis Ultra, one of the regiments sent to defend the planet against the Tyranids was the 10th Logres Regiment, led by Colonel Octavius Rabelaq. Colonel Rabelaq commanded the 10th from a Capitol Imperialis, which took part in the defence of the capital city Erebus. The vehicle was stationed behind the trench lines protecting the city, the massive war machine destroyed a large amount of Tyranids with its many weapons. However, when the line was threatened with being completely overrun during a a heavy Tyranid attack, Colonel Rabelaq charged his vehicle deep into the enemy ranks.

While his act of heroism saved the line and the defending regiment from destruction, Colonel Rabelaq found himself trapped as the Tyranids threw themselves into the vehicle's tracks, completely immobilising it. While the vehicle was immobilised a Bio-Titan attacked, the creature was severely wounded by a direct hit from the vehicle's Macro Cannon, however, the Bio-Titan's regenerative abilities healed it of most of injuries, and before another shell could be loaded it slammed into the Leviathan, knocking the war machine on its side. As the Bio-Titan ripped into the vehicle, the Colonel gave the order for the city's defensive cannons to fire on his vehicle. The resulting explosion vaporised everything within 500 metres and created a large, deep crater, the Bio-Titan was completely annihilated.

Invasion of Ultramar
During the invasion of the Realm of Ultramar by the Forces of Chaos led by M'kar the Reborn in 854.999.M41, another Capitol Imperialis, the Lex Tredecim, formed part of the Ultramarines and Imperial Guard's muster on the world of Calth, and later took part in the defence of the planet. During this time, Ultramarines Sergeant Learchus Abantes, who himself had never visited Calth before, believed that the vehicle was far too large to enter the planet's underground system of subterranean hive cities, but Captain Uriel Ventris explained that Calth's caverns were so large that the vehicle could move freely.

Adeptus Mechanicus Technical Specifications
The technical specifications of the Capitol Imperialis have yet to be released by the Adeptus Mechanicus.

Canon Conflict
The Capitol Imperialis is often confused with the Leviathan super heavy transport, due to the lack of available sources or clarification from Games Workshop the two vehicles will be treated as two separate vehicles. This is fueled by the fact that the Leviathan and Capitol Imperialis' background "fluff" is highly similar.

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