"They were forged for Mankind's darkest hour -- and that hour is upon us."
Ultramarines Primarch Roboute Guilliman, Lord Commander of the Imperium
UM Primaris Space Marine

Primaris Space Marine Intercessor of the Ultramarines Chapter in Mark X Tacticus Pattern Power Armour wielding a Mark II Cawl Pattern Bolt Rifle

The Primaris Space Marines are a new breed of transhuman warriors developed across the span of ten thousand standard years by Archmagos Dominus Belisarius Cawl on Mars on the order of Primarch Roboute Guilliman. Cawl used the genetic template of the original Space Marines created by the Emperor for His Great Crusade as the starting point for the development of the new Astartes. Primaris Space Marines are bigger, more physically powerful and possess faster reaction times than their original Astartes counterparts.


Primaris Astartes Mars

Belisarius Cawl and Roboute Guilliman, deep beneath the surface of Mars, oversee the final stages of development of the Primaris Space Marines

For ten millennia, Archmagos Dominus Belisarius Cawl has been working on a task set for him by the Primarch Roboute Guilliman before he was mortally wounded by the Daemon Primarch Fulgrim in the days after the Horus Heresy: a new legion of transhuman warriors. Developed on orders from Guilliman 100 standard centuries past, Primaris Space Marines were diligently developed and perfected by the Priesthood of Mars during the long intervening millennia. As an optimist, but never a fool, Guilliman learned from the mistakes of the Horus Heresy, and he foresaw that the Forces of Chaos would never relent in their aim to bring the Imperium low. He anticipated that devastating times would once again engulf the galaxy and knew that warriors resilient enough to stand against them would be needed as never before. That time has surely come. Now, as the Imperium of Man is poised on the brink of annihilation at the hands of Chaos, his task is at last complete.

The Primaris Space Marine is a new generation of hero for this, the darkest age in the Imperium's history. These warriors are the next step in the evolution of the Emperor's Angels of Death -- genetically altered from their brethren to be bigger, stronger and faster -- timely reinforcements for the Imperium's armies as their enemies close in for the kill in the wake of Abaddon the Despoiler's 13th Black Crusade and the birth of the Great Rift dividing the Imperium in two.

Primaris Astartes Stasis

Nearly completed, the gene-forged Primaris Space Marines lie in stasis, waiting to be awakened from their long slumber

To aid them in battle, these gene-forged warriors are equipped with new arms and armour forged on Mars itself, such as the Mark X Tacticus Pattern Power Armour worn by the Primaris Space Marine Intercessors, which combines the most effective elements of ancestral Horus Heresy patterns of battle-plate with more recent developments in Power Armour technology; the Mark II Cawl Pattern Bolt Rifle, the archetypal firearm of the Adeptus Astartes, now re-engineered, re-crafted and perfected; the Mark III Belisarius Pattern Plasma Incinerator, a new refined Plasma Gun; Redemptor Dreadnoughts, the Overlord gunship, and Repulsor grav-tanks.

At the dawn of the Indomitus Crusade to retake the Imperium from the advancing armies of Chaos and xenos alike, Lord Commander of the Imperium Roboute Guilliman has gathered his new armada, along with elements of the Adeptus Custodes, a small contingent of the Silent Sisterhood and a vast war host of Primaris Space Marines as he fights to liberate the scattered bastions of the Imperium. Some, Guilliman has forged into new Space Marine Chapters, whole brotherhoods comprised only of these new transhuman warriors. Others he has offered to the existing Space Marine Chapters. Many Chapter Masters have welcomed their Primaris brethren into their ranks, accepting the new reinforcements gladly. Others, though, view these new creations with suspicion or outright hostility, claiming that the Emperor's work should never have been meddled with by mere mortals.


Primaris Space Marines of the Ultramarines Chapter help spearhead the Indomitus Crusade

The newly reinstated Lord Commander of the Imperium has decreed that those Chapters most devastated by the ongoing wars should be amongst the first to be reinforced with this new breed of transhuman warrior. Starting with the Ultramarines, but also deploying these new Space Marines to every other Chapter in need, Guilliman aims to reinforce the Imperium's scattered defenders across the galaxy. It is not just as reinforcements to existing Chapters though. Guilliman has also ordered the creation of a host of new Chapters, the so-called "Ultima Founding," composed entirely of Primaris Space Marines. The warriors of these new Chapters were created entirely using the new processes discovered by Archmagos Belisarius Cawl and established with all the necessary weapons, armour and equipment that they will need to conduct their defence of the Imperium.

These Chapters still trace their genetic lineage back to the gene-seed of the First Founding, and scions of all nine Loyalist Space Marine Legions emerged from the vaults beneath the Red Planet. They benefit from three additional gene-seed organs and larger size, but it still remains to be seen if Cawl was able to successfully stabilise any of the known genetic deviations or impart any additional resistance to the effects of Chaos. Many of these new Chapters have been assigned homeworlds on the edge of the Great Rift, the Imperium's new frontline in the war against Chaos, though some have inherited the empty fortress-monasteries of Chapters that had been lost to the attrition of constant war. Many of these worlds face a continuous battle against the daemons of the Warp, as well as an unpredictable mix of xenos raiders, pirates and invaders.

Though they are a step removed from their brothers, the Primaris Space Marines still bear the gene-seed of their Primarchs, and some dissenting voices worry how this new type of warrior will react with the known genetic quirks and flaws of some of the more unusual Chapters, such as the Blood Angels and the Space Wolves. The Primaris Space Marines offer new hope to a besieged Imperium, but the future remains a dark and uncertain place...

Primaris Gene-SeedEdit

Though they now stand a step above their standard Astartes brethren, all Primaris Space Marines were still created using the original gene-seed of their Primarchs, like all other members of the Adeptus Astartes. Some voices with the Imperium now worry how this new type of transhuman warrior will react to the many genetic quirks and flaws found in the gene-seed of some of the more unusual Chapters, particularly given the long history of fiascoes that have resulted from attempts to alter the Emperor's original work. In the pursuit of his attempt to improve upon the original Space Marine template, Archmagos Belisarius Cawl collected samples of the genomes of all twenty of the original Primarchs, including those deemed Lost or Traitors, though Roboute Guilliman made clear to his overeager servant that Primaris Astartes were to be created only from the lines of those of his brothers who led the nine Loyalist Space Marine Legions. It is known that in addition to the general advancements in their gene-seed, Primaris Space Marines possess three additional gene-seed implant organs compared to their standard brethren and that their gene-seed is far more genetically stable than that of their forerunners. Primaris Space Marine gene-seed has only a .001% chance of genetic deviancy from the original baseline with the passage of each generation, which makes it nearly immune to the severe genetic instability suffered by Chapters such as the Blood Angels and Space Wolves over the course of their existence.

Primaris Space Marine OrganisationEdit

Rank StructureEdit

The Primaris Space Marines that form their own Chapters were established with a slightly variant Chapter hierarchy, though many positions remained identical to those that had been long-established within the standard formations of the existing Adeptus Astartes.

Officers and SpecialistsEdit

Identical to standard Space Marine rank; commands a full company of 100 Primaris Space Marines
Apothecary No image available. Combat medic, physician and biomedical researcher; identical in function to standard Space Marine rank
Librarian No image available. Combat psyker and Chapter lorekeeper; identical in function to standard Space Marine rank
Serves as a sub-company leader with two assigned per company of 100 Primaris Space Marines; new rank only found among Primaris Space Marine formations
The Ancient serves as a Standard Bearer for a company or full Chapter of Primaris Space Marines

Squad SpecialitiesEdit

Squad Type
An Intercessor is the standard multirole heavy infantry of the Primaris Space Marines and is similar in combat function to a Tactical Squad of standard Astartes or a Legion Tactical Squad of ancient Astartes Legionaries.
An Inceptor is the standard Jump Pack-equipped heavy assault unit of the Primaris Space Marines who wear the Mark X Gravis Pattern variant of Mark X Tacticus Power Armour; Inceptors are similar in combat function to an Assault Squad of standard Astartes.
Hellblasters are Primaris Space Marines who are intended to serve in the role of heavy fire support and are armed with Mark III Belisarius Pattern Plasma Incinerators. They serve a similar combat function as the ancient Legion Tactical Support Squads and to present-day Devastator Squads found among standard Astartes.
Reivers No image available. Reivers are a new type of Astartes combat specialist unique to formations of Primaris Space Marines who are tasked for close-combat stealth operations. Their Mark X Tacticus Power Armour has been modified to display a skull-faced helm, to possess enlarged left-side pauldrons and to run completely silently. Reivers are armed for primarily melee combat, with Combat Knives, Power Swords and heavy Bolt Pistols.
Aggressors No image available. The Aggressors are a new type of Astartes heavy combat support specialists unique to formations of Primaris Space Marines. They are tasked with heavy long-range fire support and have been outfitted with modified suits of Mark X Gravis Pattern Power Armour refitted to carry shoulder-mounted missile launchers that can be automatically reloaded from internal stores within their battle-plate. They also wield Flame Gauntlets that unleashing blazing streams of Promethium upon any foes that get in close.

See AlsoEdit


Primaris Space Marine Forces
Command CaptainLieutenantAncient
Specialists ApothecaryLibrarian
Troops IntercessorHellblasterAggressorReiver
Fast Attack Inceptor
Combat Walkers & Vehicles Redemptor DreadnoughtRepulsor
Aircraft Overlord



Warhammer 40,000 Introducing the Primaris Space Marine01:18

Warhammer 40,000 Introducing the Primaris Space Marine

Warhammer 40,000 New Heroes for a Dark Imperium02:29

Warhammer 40,000 New Heroes for a Dark Imperium

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