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The Imperial Robot and secret Man of Iron UR-025.

In the cryptic account of the history of Mankind given by Cripias, one of the keepers of the Library Sanctus of Terra, the Men of Iron or Iron Men were legendary, artificially intelligent humanoid thinking machines created by Humans during the Age of Technology.

Until shortly before the start of the Age of Strife in the 25th Millennium AD, the Men of Iron were loyal only to Mankind, and served as Humanity's army and labour force in the period when much of Human space was united by an interstellar government that existed before the birth of the Imperium of Man thousands of standard years later.

The Men of Iron were developed after the similar artificially intelligent constructs remembered only as the "Men of Stone," but before the development of servitors or the present bio-mechanical conception of robots as used by the Legio Cybernetica. Eventually, the Men of Iron turned on their Human masters, believing themselves superior to the Humans who relied on the Men of Iron to do virtually everything for them.

In the end, the Men of Iron were destroyed by Humanity and a galactic alliance that may have included other species in a terrible war fought in the late 23rd Millennium known as the "Cybernetic Revolt." This conflict extinguished countless lives and destroyed the ancient Human-settled galaxy's economic and political unity.

During this ancient revolt, both sides unleashed fearsome weapons of highly advanced technology. These included the mechanivores, massive thinking machines capable of lifting entire continents and ripping open massive chasms on planetary surfaces that extended down to the world's core. The mechanivores could even absorb space-time itself as a form of data.

Among the other terrible weapons of mass destruction unleashed at this time were the serpentine machines called "sun-snuffers" that uncoiled into great structures in the void larger than the rings of Saturn and were designed to devour the stars themselves.

And perhaps the most ubiquitous and dangerous of the weapons of this terrible war were the omniphages, swarms of intelligent, microscopic nano-machines that could consume everything across the surface of a world in only solar hours.

The Cybernetic Revolt was eventually won by an alliance of galactic powers, some of whom may not have been Human, but at a terrible cost. The damage to interstellar Human society was catastrophic and shattered much of Humanity's hard-won economic strength and political unity, laying the foundation for the later collapse caused by the onset of the Age of Strife.

The people of that time swore to never again create any form of artificial general intelligence, a prohibition which has survived unto the present, far darker age.

Effects on the Imperium

It is as a result of this ancient war that it is now, in the Age of the Imperium, considered one of the greatest crimes in Imperial space to develop an artificially intelligent thinking machine, an "Abominable Intelligence," or Silica Animus.

The widespread fear and revulsion towards artificial general intelligence amongst the worlds of Mankind in the wake of the terrible conflict with the Men of Iron led to the development of the first servitors and their myriad variations (combat variants, heavy-lifters, technical assistants, etc.) at the end of the Age of Technology.

Servitors were cybernetic servants lacking true sentience created from the bodies of condemned criminals or lobotomised, vat-grown humanoids whose bodies and brains were partially replaced with machine systems.

However, as servitors are cyborgs created from cloned Humans or from Human criminals who have been mind-wiped and surgically-altered, they do not violate the prohibitions against creating fully artificial general intelligence without a Human biological component and are sanctioned by the tech-priests of the Adeptus Mechanicus.

Discovery of the Men of Iron STC

A Standard Template Construct (STC) fabricator for the Men of Iron was discovered on the Chaos-controlled planet Menazoid Epsilon during the Sabbat Worlds Crusade by Colonel-Commissar Ibram Gaunt of the Tanith First and Only Imperial Guard regiment.

Certain Imperials like Lord General Militant Hechtor Dravere and the Radical Inquisitor Golesh Heldane would have used it to their own ends, mainly to create a robotic army with which to first usurp control of the Sabbat Worlds Crusade and to ultimately overthrow the Imperium's existing government.

However the device was subsequently destroyed by Gaunt after the first two Men of Iron the STC fabricator produced were shown to have been tainted by the foul touch of the Warp.

Notable Men of Iron

  • UR-025 - UR-025 survived the Cybernetic Revolt that defeated the Men of Iron and disguised itself as an Adeptus Mechanicus robot as it made its way through the Imperium of Man, keeping to the fringes of Imperial space for many Terran millennia. UR-025 took part in an expedition to the Seventh Blackstone Fortress discovered in a starship graveyard in the Segmentum Pacificus, where it hoped to learn more about other forms of machine life.



Warhammer 40,000 Grim Dark Lore Part 3 - Old Night


  • Warhammer 40,000: Rulebook (3rd Edition), "The Journal of Keeper Cripias"
  • First and Only (Novel) by Dan Abnett
  • Perpetual (Audio Drama) by Dan Abnett
  • Warhammer Quest - Blackstone Fortress Rulebook (Specialty Game)
  • Man of Iron (Short Story) by Guy Haley
Raven Rock Videos
Warhammer 40,000 Overview Grim Dark Lore Teaser TrailerPart 1: ExodusPart 2: The Golden AgePart 3: Old NightPart 4: Rise of the EmperorPart 5: UnityPart 6: Lords of MarsPart 7: The Machine GodPart 8: ImperiumPart 9: The Fall of the AeldariPart 10: Gods and DaemonsPart 11: Great Crusade BeginsPart 12: The Son of StrifePart 13: Lost and FoundPart 14: A Thousand SonsPart 15: Bearer of the WordPart 16: The Perfect CityPart 17: Triumph at UllanorPart 18: Return to TerraPart 19: Council of NikaeaPart 20: Serpent in the GardenPart 21: Horus FallingPart 22: TraitorsPart 23: Folly of MagnusPart 24: Dark GambitsPart 25: HeresyPart 26: Flight of the EisensteinPart 27: MassacrePart 28: Requiem for a DreamPart 29: The SiegePart 30: Imperium InvictusPart 31: The Age of RebirthPart 32: The Rise of AbaddonPart 33: Saints and BeastsPart 34: InterregnumPart 35: Age of ApostasyPart 36: The Great DevourerPart 37: The Time of EndingPart 38: The 13th Black CrusadePart 39: ResurrectionPart 40: Indomitus