Aethon Heavy Sentinels are a common sight among the ranks of the Solar Auxilia and are most often piloted by grizzled veterans adept at identifying key enemy targets. These robust machines are able to traverse void station interiors and ruined cityscapes with ease, often forming the lynchpin around which many a successful close-quarters assault has swung.

The Knight Questoris is the most prominent variety of Knight Armour on the battlefields of the Horus Heresy, striding forth alongside the Legiones Astartes, Taghmata Omnissiah, and in the great armies of Knight Households. Such was its popularity amongst the noble scions of the Questoris Households that it was reconfigured in myriad ways with weapon options and hull augments, and given names such as Paladin, Errant, Warden, Gallant, and Crusader to reflect their traditions, lineage, and fighting styles.

Ahzek Ahriman has the unique distinction of being both the first and last Chief Librarian of the Thousand Sons, and is the most gifted mystic among their already-formidable psyker corps. A respected commander even before his Legion's reunion with its missing Primarch, Ahriman's keen intelligence and talent in warpcraft soon made him Magnus' foremost apprentice, but his greatest strength is his indefatigable will. Ultimately, this determination would see him play a pivotal role in the Burning of Prospero – and walk strange and terrible paths long after the close of the Horus Heresy.

The Horus Heresy is a conflict of unparalleled destruction, spread across myriad vital campaigns. Embroiled for years in a grinding war of nearly unfathomable scope, the Garmon Cluster now acts as the final break against which the tides of the Warmaster’s forces must crash. Its capital, the Beta-Garmon system, is a burning pyre of armies, where Loyalist forces – led by the Great Angel Sanguinius, the Warhawk Jaghatai Khan, and the remnants of the Shattered Legions – fight to buy precious time before the assault on Terra can begin in earnest.

Cerastus Knights are sophisticated and towering war-suits, faster and more agile than the smaller Questoris class. The Knight Acheron is a fearsome sight on the battlefield, a reaper of lives designed not only to destroy, but also to inspire terror. The presence of a Knight Acheron warns the foe to expect no mercy, for such grim weapons are only deployed for missions of extermination, to topple the works of the enemy and scour clean their lands with flame.

Cerastus Knights are sophisticated and towering war-suits, far more agile than the smaller Questoris class. The Knight Castigator scythes down hordes of lesser foes that might otherwise overwhelm even a Knight through sheer numbers. Capable of obliterating infantry formations in a thunderous rain of mass-reactive explosions or carving apart light vehicles with ease, the Castigator is renowned for the stoic nature of its machine spirit, and often relied on to hold the line.

Cerastus Knights are sophisticated and towering war-suits, with speed and agility that far exceeds the lumbering Questoris-class. The Knight Lancer is the most widely-known variant of the Cerastus chassis, held in high esteem by more impetuous House scions. Its protective ion gauntlet and potent shock lance are perfectly suited to duelling titanic foes face-to-face, and such pilots often race ahead to seek glory by vanquishing the enemy's most prized war machines.

The Cerberus is a rare variant of the Spartan chassis that uses its massive hull to mount a prototype neutron laser projector, as well as the sizable arc-reactors and radiation shielding needed to operate the weapon. The neutron laser is poorly understood by the adepts of the Mechanicum, but stands among the most effective anti-tank weapons available to the Space Marine Legions, capable of punching through the strongest plating and shorting out its target’s systems with bursts of radiation. The terrible toll the Cerberus takes on its crew is regarded by many commanders as a necessary cost, for this impressive tank can threaten even Titan-class opponents.

Perhaps the most advanced Dreadnought engine in the arsenal of the Great Crusade, the Contemptor Dreadnought fuses traditional technologies with arcane cybernetic lore. A powerful atomantic reactor fuels the Dreadnought's impressive speed and strength, while also supplying the defensive energy fields that further increase its battlefield durability. Equipped with a versatile armoury of weapons that allow it to serve as a mobile heavy weapons platform, assault powerhouse, or versatile linebreaker, the Contemptor has found a place within every Legion, no matter their preferred tactics.

The Predator is perhaps the best known and most widespread variant of the basic Rhino chassis. Augmented with superior armour and firepower, it entirely sacrifices the Rhino’s troop transport capacity in favour of ammunition and generators for its formidable weapon systems. The result is an effective and versatile tank of the line, with an excellent balance of speed, firepower, and protection. The Predator's robust design can field a wide variety of armament configurations – the Legiones standard is a rapid-firing turret mounted autocannon, but other configurations include a powerful heavy lascannon, or more exotic grav and volkite weapons.

The Predator is perhaps the best known and most widespread variant of the basic Rhino chassis, equipped with superior armour protection and firepower, but sacrificing the Rhino’s troop transport capacity entirely. The Predator Support Tank is designed to field a wide variety of armament configurations, allowing it to excel in specific battlefield roles.

The Rhino is the most widely used armoured personnel carrier in the Imperium. Based on ancient STC technology, the fundamental design is robust, reliable, and easy to maintain, with an adaptive power plant that can run off a wide variety of fuels, making it perfect for the wide-ranging armies of the Great Crusade – and the wars of the Horus Heresy. As such, the Rhino chassis serves as a basis for many other war machines, and these transports are produced in their thousands – several distinct patterns are in common use throughout the galaxy, with the heavily-armed Deimos being the most widespread amongst the Space Marine Legions.