Adeptus Mechanicus

"There is no truth in flesh, only betrayal." "There is no strength in flesh, only weakness." "There is no constancy in flesh, only decay." "There is no certainty in flesh but death.""

- Credo Omnissiah

The Adeptus Mechanicus is the official Imperial name within the Adeptus Terra for the Cult Mechanicus or Cult of the Machine. In ancient times, before the current Age of the Imperium officially began following the end of the Horus Heresy, it was often called the Mechanicum. The Mechanicus acknowledge the Emperor of Mankind as the ruler of the Imperium of Man, but not the religious truth of the Imperial Cult or the Ecclesiarchy. Instead, the Mechanicus follows its own dark and mysterious scriptures and worships the deity they call the Machine God or the "Omnissiah." The Adeptus Mechanicus believes knowledge is the true manifestation of divinity in the universe, and all creatures and artefacts that embody knowledge are holy because of it. The Emperor is the supreme object of worship for Mankind, the living embodiment of the Machine God or Omnissiah, because he comprehends so much, understanding more about the true nature of reality than any other being in existence. The Adeptus Mechanicus also regard organic flesh as weak and view the removal and replacement of biological tissue with mechanical, bionic parts as sacred. Most elder Tech-priests have few organic parts left and eventually become more machine than man. The Adeptus Mechanicus is based on Mars, the very first Forge World of the Imperium, and they are the sole rulers of the Red Planet. They provide the technical and scientific experts of the Imperium and field armies of massive Titans, Mechanicus Electro-priests, Skitarii and combat Servitors.

History
The Adeptus Mechanicus is the one Imperial Adepta that as the Cult Mechanicus actually predates the Imperium of Man itself, and was known originally as the Mechanicum of Mars. Though the Adeptus Mechanicus was formally integrated into the Imperium of Man by the Treaty of Mars (known as the Treaty of Olympus Mons to the Mechanicum) over 10,000 Terran years before the "present" of the 41st Millennium at the dawn of the Emperor's Great Crusade to reunite Mankind in ca. 800.M30, it retains an unparalleled degree of autonomy from the rest of the Adeptus Terra for an Imperial Adepta. This autonomy was guaranteed to the Mechanicus in the Treaty of Mars to provide the Tech-priests with immunity to the dictates of the atheistic Imperial Truth and to allow the Mechanicus to continue to exercise sovereignty over all of the Forge Worlds it had settled across the galaxy during the Age of Strife. In return, the Mechanicus agreed to aid in the construction of the massive fleets and the provision of the technical aid necessary for the Imperium of Man to launch the Great Crusade.

Whereas nearly all the citizens of the Imperium observe the tenets of one of the various sects of the Imperial Cult that worships the Emperor of Mankind as the God-Emperor, the Adeptus Mechanicus is virtually synonymous with the Cult Mechanicus, another faith that could easily be considered heretical by the rest of the Imperium if the Adeptus Mechanicus was not essential to the survival of the Imperium and if the Tech-priests had not proven their loyalty to the Emperor in countless ways.

The Adeptus Mechanicus is vitally important to humanity because the Imperium, despite its technologically advanced state, has a very limited scientific knowledge of how its technology actually functions. This has only reinforced the prevailing Imperial view that the building and use of advanced machinery is almost a magical or religious act, fraught with ritual and inviolable instructions. The Adeptus Mechanicus, with its inherent understanding of the Machine Spirit and the Machine God, has a near-monopoly on Standard Template Construct (STC) designs and other advanced Imperial technological knowledge. As a result, the Mechanicus wields a tremendous amount of power in the Imperium as the primary manufacturer, maintainer and repairer of everything from basic farming equipment to interstellar warships.

Mars
The birthplace of the Adeptus Mechanicus was the ancient Forge World of Mars. Mars was colonised very early in human history, long before the start of even the Dark Age of Technology, and developed a society different from Terra both culturally and in terms of technological advancement. The arid, rusty surface of Mars was terraformed, and under a man-made oxygen-nitrogen atmosphere, the Martian colony flourished, though it remained politically independent from Terra. When the era of human interstellar colonisation began, both Terra and Mars served as the co-equal mother worlds of countless new human colonies across the galaxy.

During the Dark Age of Technology, the two empires of Terra and Mars co-existed under the aegis of the decentralised human interstellar government of that era, to the mutual benefit of both. At the height of its splendour during that era, and even later in the anarchic Age of Strife, Mars despatched hundreds of colony fleets into the void. Many perished in the terrible Warp Storms that engulfed the galaxy at that time before the birth of the Chaos God Slaanesh, but others survived or made their way forward at sublight speeds in realspace. Those who did founded new Forge Worlds in the name of the Machine God and built on them a likeness of the great manufactorums and temples of their distant homeworld. These Forge Worlds also forged new empires for the Mechanicus among the feudal Knight Worlds and added their unique combat walkers, the Knights, to the Mechanicus' own powerful arsenal.

The onset of the Age of Strife brought an end to the glory and peace of the ancient interstellar human domain. Across the galaxy, Mankind suddenly turned upon itself as a new breed of Warp-attuned psykers emerged and Warp Storms engulfed the galaxy, rendering interstellar travel and communication dangerous to the point of impossibility. Civil war engulfed thousands of human worlds, even the twin human homeworlds of Terra and Mars.

Many warring factions vied for power on Mars and waged a brutal civil conflict using arcane and unimaginably destructive weaponry, including psychic abilities. The carefully constructed atmosphere of Mars was burned away, and once more the rusty surface of the planet was exposed to the deadly radiations of the Sun. The terraformed Martian environment, which had teemed with Terran life for centuries, was rendered a barren crimson desert again. The Martian combatants now fought in the same blood-hued wastelands that the first human colonists from Terra had found millennia before. Much of the Martian population retreated underground, as any who were not equipped with a radiation and life support suit could not long survive on the Red Planet's harsh surface.

In time, one faction emerged dominant over all the others that had contended for dominion over Mars -- the Cult of the Machine God, the Mechanicum. Believing deeply in a strange theology which held that the expression of the universe's divinity, the Omnissiah, was embodied in advanced technology and machines, the Cult Mechanicum established its rule over the Red Planet and erected massive new manufactorums and hive cities across the world, divided into different city-states known as forges or forge cities. Each forge was ruled by a high-ranking Tech-priest, and the entirety of the Mechanicum's hierarchy bowed to the high priest known as the Fabricator-General.

For millennia the Mechanicum ruled over Mars, sending out colony expeditions to spread its faith and its way of life across the galaxy, which led to the founding of the first Forge Worlds. Mars also made war upon the divided techno-barbarian states that ruled Terra at this time, as many of these ignorant savages had access to advanced technologies left over from the Age of Technology that they did not understand or know how to venerate properly. This innate hostility between Mars and Terra lasted for centuries until in the late 30th Millennium, following his victory in the Unification Wars on Terra, the Emperor of Mankind came to Mars and landed atop the great volcano of Olympus Mons. At their first sight of the Master of Mankind many Tech-priests were overcome with the feeling that they had met the living embodiment of the Omnissiah, the Machine God clad in human form. In return for peace between Terra and Mars, the recognition of the Tech-priests' right to practice their faith and their right to maintain control over both Mars and the other Forge Worlds they had settled, the Mechanicum agreed to build Imperial starships at Mars' Ring of Iron orbital fleet yards and provide all of the war materiel necessary for the Emperor's Great Crusade. In addition, the Mechanicum agreed to be bound by the Emperor's commandment to never develop certain forbidden technologies such as artificial intelligence. Though the Mechanicum had no knowledge of it, it was artificial intelligence that had nearly destroyed humanity once before during the rebellion of the Men of Iron in the Dark Age of Technology and the Emperor was determined not to repeat history. With the signing of this agreement, known as the Treaty of Mars or the Treaty of Olympus Mons within the Mechanicum, the Cult Mechanicum became the Adeptus Mechanicus of the new-forged Imperium of Man, and the Imperial Aquila was refashioned to bear two heads, one for Terra and one for Mars.

Yet the terms of this agreement did not sit well with some within the hierarchy of the Mechanicum. A minority of Tech-adepts believed that the Emperor was not the Omnissiah, for the Machine God that the Mechanicus had always worshipped actually lay sleeping deep beneath the crust of Mars in the Noctis Labyrinthus. These Tech-priests particularly chafed at the end of Mars' political independence and the imposition of the Emperor's restrictions upon what technologies the Tech-priests of the Mechanicum could research and develop. As the Great Crusade progressed into the early 31st Millennium, these simmering discontents would ultimately cleave the Mechanicum just as it would the wider Imperium.

During the Horus Heresy many Mechanicum units declared for the Warmaster Horus and fought against those of their faith who remained loyal to the Emperor, becoming known in later times as the Dark Mechanicus. These Traitor Mechanicus units initiated a civil war on the Red Planet known as the Schism of Mars that mirrored the larger conflict raging across the galaxy. The Fabricator-General himself sided with the Warmaster, but his deputy, the Fabricator Locum Kane, remained loyal to the Emperor. Horus swayed the Fabricator-General of the time, Kelbor-Hal, to the side of Chaos by promising him a complete STC database from the planet of Drakonis-Three-Eleven and brought the senior Tech-adept in his 63rd Expeditionary Fleet named Regulus over to his side with other STCs recovered from the Imperial conquest of the Auretian Technocracy. Horus promised much else in terms of technological knowledge to the Mechanicum, including the right to develop technologies like artificial intelligence previously forbidden by the Emperor in the Treaty of Mars in return for their allegiance to his cause. Many Master Adepts like Kelbor-Hal longed to pursue these restricted lines of research and had long believed that the Emperor was not the Omnissiah of the Machine God, for the true Machine God dwelled in the Noctis Labyrinthus deep below the crust of Mars. That this legendary creature may actually have been the C'tan shard known as the Void Dragon is a disturbing possibility.

Pre-Heresy Mechanicum Forge World Hierarchy
The following is an exemplary illustration of the military-feudal organisational structure depicted in the abstract of a trans-Martian Forge World, as rendered by the Office of the Principia Militaris of the Great Crusade early in the first decade of the 31st Millennium.
 * Archmagos Intendant (Planetary Governor) - An Archmagos Intendant was given equal rank to an Imperial Commander and Planetary Governor, with full executive, temporal and spiritual power over their domains, with notional fealty only to Mars and the Emperor. Note that various alternative nomenclatures for this title are used on different Forge Worlds (e.g., Hierophant Technis (Ryza), Gnostarch (Antioch Majoris), Fabricator Potentate (Tigrus), Vox-Omnis (Incaladion), Revered-Comptroller (Phaeton Prime).
 * The Holy Synod of the Lord Magos (Ruling Feudal-Clerical Oligarchy of the Forge World) - Each member of the synod is a magnate and sub-ruler of their own domain or forge-fane, as well as a high-ranking priest of the Cult Mechanicus, tied to the larger web of the Forge World through a complex network of alliances, preference, arcane technological specialty and religious rank.
 * Notional Synod seniority by title in order of power:
 * The Archmandriture (Chamber Cardinal)
 * The Archmagos
 * The Magos Majoris
 * The Magos Ordinary
 * Notable Divisions of Techno-Arcana among the Synod commonly included:
 * Hespherstari
 * Provender
 * Explorator
 * Genetor
 * Logis
 * Vulpaxis
 * Metallurgicus
 * Lictanex
 * Dominus
 * Cordantor
 * Mhalagra
 * Alchemys
 * Myrmidex
 * Lachrimallus
 * The Tachmata Omnissiah - The Tachmata Omnissiah was a military command protocol enacted in times of war or to create a detached military formation varying in size from sub-division to macro battle group, constructed by predetermined configurations of retainer troops, Tech-Priests, war engines and support systems, placed under the command of a number of Magi of the Synod and commanded by Magi/Archmagi designated "Prime".
 * The Legio Cybernetica  - Sacred orders of Tech-priests devolved into cohorts charged with the construction and use of Battle-automata, existing both as fully independent structures and sub-factions owing either pacts of mutual support or alliance with the Synods of major Forge Worlds.
 * The Magos Militant/Secutarius - Lower ranked Magi as well as assigned Tech-priests and prelates of militant sub-cults of the Mechanicum utilised by the Taghmata as a field command and control cadre. Each will commonly possess their own acolytes, retainer forces and sub-units owing then direct fealty.
 * Principal Tactical Divisions of the Tachmata
 * Associated Orders & Sub-Cults Militant - Composition will vary greatly depending on the Taghmata disposition, role and the tendencies and alliances of the governing Forge World Myrmidon Cult, etc:
 * Lacyraemara
 * Indentured Labour Units
 * Adseculatis Modified Troops
 * Bio-Alchem Cadres
 * Tech-Priest Lacyraemarta Covenants
 * Cyber-Hybrid Carnivora
 * Munitoria Logis - Provender of Munitions and Wargear, Servitor and Drone Cohorts. Assigned to Taghmata service.
 * Signatus Avox
 * Lexmachanicus Auditorii
 * Macrotechnia
 * Enginseer Covenants
 * Tech-thrall Combat Units
 * Macro-Machina
 * Ordinatus Locum
 * Technographica Determinus
 * Bonded Cybernetica
 * Battle-Automata
 * Siege-Automata
 * Bonded Tech-priest Covenants
 * The Autokrator
 * Ground Armour
 * Pioneer Forces
 * Mobile Artillery Units
 * Tech-Guard Regiments
 * The Knight Houses of the Questoris Familia - The ruling noble houses of the Knight Worlds form their own unique culture and traditions from their own unique culture and traditions which have become closely linked with the Mechanicum over time. Households often deploy alongside the Legio Titanicus in support.
 * The Basilikon Astra - The division of the Machine God's servants tasked with the construction, use and operation of void craft and interstellar vessels. This order's divisions by their nature control the outer reaches of a Forge World's systems and so stand apart from the planetary synods, but are still tied to them by dependence and ancient tradition.
 * The Skitarius (Tech-Guard)  - Ancient standing armies of elite cybernetically and genetically engineered troops, originating on Mars and principally loyal to the office of the Fabricator-General. The Skitarii, also known as the Mechanicum Protectors, are not members of the priesthood, but follow their own unique martial traditions and sub-cult of the Omnissiah. Skitarii regiments maintain entirely separate structures of organisation and tactical deployment outside of the Taghmata and are assigned at the behest of the Lords of Mars.
 * The Prefecture Magisterium - Doctrinal covenant of the Machine Cult charged with preserving dogma and the persecution of techno-heresy. Magisterium Cohorts and hunter-killer claves are maintained on all Forge Worlds under the authority of the Archmagos Intendant.
 * The Legio Titanicus - The division of the Titan Legions, the Princeps and Moderatii of the Legio Titanicus are charged with the baleful right and onerous duty of mastering and maintaining the God-Machines that are the avatars of the Omnissiah's destructive wrath. The manifold Titan Legions are spread through the Omnissiah's domains as their shield and their strength, as well as operating as the hammer of the Great Crusade. The Legio Titanicus form an ancient military society existing in parallel with the Mechanicum priesthood, including their own support structure, domains and military retainers (Scutarii).
 * The Ordo Reductor  - Mendicant order of Tech-priests devoted to the art of siege craft, demolition and mass destruction. The Ordo Reductor is essentially nomadic, gravitating to areas of intense warfare, but maintains links to major Forge Worlds for resupply and support.

Post-Heresy Adeptus Mechanicus Forge World Hierarchy

 * Fabricator General
 * Fabricator Locum
 * Priests of the Cult Mechanicus
 * Legiones Skitarii - The naming convention presented below is that used by Mars and most of its brother forge worlds; some style their armies the "Divsion Skitarii" and group their cohorts into regiments instead.
 * Macroclade 1 - (Known variously as Prima Macroclade, Macroclade Primus, ect.) A forge world's first macroclade traditionally garrisons its Titan Legions and/or Ordinatus Engines.
 * Macroclade 2
 * Macroclade 3
 * Macroclade 4
 * War Cohort 1 - Each War Cohort is identified by a cohort numeral displayed on the hull of their Onager Dunecrawler vehicles.
 * War Cohort 2
 * War Cohort 3
 * War Cohort 4
 * Battle Maniple Delta - The typical Skitarii maniple is the combined arms Battle Maniple, but specialist cohorts, maniples and clades can be arranged as needed: Infiltration Clades, Armoured Cohorts, Assault Maniples, Anti-aircraft Cohorts, Anti-tank Cohorts, and son on. Units in a Battle Maniple are identified by a common maniple sigil, usually displayed next to squad and vehicles identification numbers. Other formations are identified by combinations of glyphs and sigils on the bodywork of their war machines.
 * Skitarii Rangers
 * Skitarii Vanguard
 * Sicarian Infiltrators
 * Sicarian Rustwalkers
 * Ironstrider Cavalry
 * Onager Dunecrawlers
 * Battle Maniple Epsilon
 * Battle Maniple Omega

The Cult Mechanicus
The Cult Mechanicus believes knowledge to be the manifestation of divinity, and holds that anything embodying or containing knowledge is holy because of it. The supreme object of devotion is therefore the omniscient Machine God (also known as the Deus Mechanicus or, in its embodied form as the God-Emperor, the Omnissiah), an eminent and omnipotent spirit governing all machinery and knowledge in the universe. Generally, this deity is held to be an aspect of the God-Emperor (or, most commonly within the Cult itself, both are held to be aspects or faces of the same divine being). The Omnissiah is believed to be friendly to humanity, and to be the originator of all human technological and scientific knowledge. Subservient to the Omnissiah are the pantheistic Machine Spirits, who are believed to inhabit all machinery and which must be appeased before a piece of technology is used or repaired, lest the machinery fail.

It should be noted that the Void Dragon, one of the C'tan Star Gods who are the true masters of the Necrons, is supposedly hidden somewhere beneath the surface of Mars. This could be what the Adeptus Mechanicus actually worship as the Machine God. The existence of the C'tan beneath Mars is a highly classified secret of the Imperium.

The Quest for Knowledge
"The universe is not like a puzzle-box that you can take apart and put back together again and so solve its secrets. It is a shifting, uncertain thing which changes as you consider it, which is changed by the very act of observation. A powerful man is not a man who dissects the universe like a puzzle box, examining it piece by piece and measuring each piece with scientific precision. A powerful man has only to look upon the universe to change it."

- Techno-Magos Gaelos

The ultimate goal of the Cult Mechanicus is to understand and fully comprehend the glory of the Omnissiah. The communal and personal attempt at this form of enlightenment is known as the Quest for Knowledge. The Cult believes that all knowledge already exists in the universe, and it is primarily a matter of time before it can be gathered together to complete the Quest. The Cult is therefore disinclined to perform most basic scientific research and development. Despite this, some original scientific research does continue on Mars and the other Forge Worlds of the Imperium, enough to keep Imperial technology advancing steadily, if extremely slowly. The faith of the Cult is defined by a series of sixteen precepts, known as the Sixteen Universal Laws, which have been divided into two sets of eight precepts known collectively as the Mysteries and the Warnings, which are listed below.

The Mysteries of the Cult Mechanicus

 * Life is directed motion.
 * The spirit is the spark of life.
 * Sentience is the ability to learn the value of knowledge.
 * Intellect is the understanding of knowledge.
 * Sentience is the basest form of Intellect.
 * Understanding is the True Path to Comprehension.
 * Comprehension is the key to all things.
 * The Omnissiah knows all, comprehends all.

The Warnings of the Cult Mechanicus

 * The alien mechanism is a perversion of the True Path.
 * The soul is the conscience of sentience.
 * A soul can be bestowed only by the Omnissiah.
 * The Soulless sentience (i.e. Necrons) is the enemy of all.
 * The knowledge of the ancients stands beyond question.
 * The Machine Spirit guards the knowledge of the Ancients.
 * Flesh is fallible, but ritual honours the Machine Spirit.
 * To break with ritual is to break with faith.

Factions
There are numerous religious factions within the Adeptus Mechanicus, including the Khamrians, who pursue the forbidden science of artificial, or "abominable" intelligence which has been forbidden since the catastrophe caused by the Iron Men who attacked humanity during the Dark Age of Technology; the Omnissiads, who seek to summon the Machine God into a physical avatar other than the Emperor; and the Organicists, who see biological enhancement using genetic engineering as equal to the more common cybernetic enhancements for which the Tech-priests of the Mechanicus are best known. Some of these sects are accepted as legitimate interpretations of the Omnissiah, others are persecuted by the broader Cult Mechanicus and the Inquisition as Heretics.

The portion of the Adeptus Mechanicus that split off to serve Chaos and the Chaos Space Marine Traitor Legions during the Horus Heresy is called the Dark Mechanicus. These Chaos-worshiping Magi seek to combine the power of the Warp with that of the Machine God in the name of the Ruinous Powers, who they view to be the true expression of the Machine God since they offer knowledge that the Emperor forbids. They are also responsible for constructing the majority of the war-machines for the Chaos Space Marines. Such creations include the Stalk Tanks of the Blood Pact, the Hell Talon fighter-bombers and the gargantuan Harbinger bomber recently deployed by the Forces of Chaos. It is also believed that some Dark Mechanicum Adepts have split into the Chaos faction known as the Obliterators.

Tech-priests
Any member of the Cult Mechanicus over the rank of Menial will often be referred to as a Tech-priest, though Magi and higher ranks are usually referred to by their rank. Tech-priests can usually be recognized by their clothing, which unless their work requires otherwise will usually be robes of rust-red or black colouration, and by their cybernetic nature. Some Tech-priests also carry a large wrench-like tool, that doubles as an ax-headed close-combat weapon, adorned with Adeptus Mechanicus imagery upon the head. The amount of cybernetic augmentation found in a Tech-priest is highly dependent on his rank within the Cult Mechanicus; a novice may have only one or two augmetic systems, if any, while very senior members may have only a few biological organs left in their bodies. Common cybernetic augmentations for Tech-priests include:


 * Bionic limbs and organs, which may replace the originals because of an accident or simply because they provide enhanced capabilities or cater to the special needs the Tech-priest may face in his chosen work or scientific research.
 * Bionic eyes, which allow a Tech-priest to see beyond the normal spectrum of human vision, augment or alter electromagnetic input to allow night vision or heat vision, and zoom in to magnify an image.
 * Mechadendrites, bionic tentacles that attach to the spine to afford the Tech-priest greater mobility, greater lifting and manipulation capabilities, an easy neural interface with most other forms of technology and, in many cases, a handy weapon in a fight. These powerful devices are usually customised to suit the work needs of their wearer and can therefore include special features like medical equipment, maintenance tools or weapons. Larger Mechadendrites can often extrude a monomolecular blade or fire projectiles in combat or simply be used as a blunt instrument. A Cortical Implant is also usually required for the Tech-priest to be able to effectively control the additional limbs.
 * Autosanguination, a process by which all the natural blood in a human body is removed and replaced with a more efficient oxygen and waste-carrying synthetic chemical substitute, allowing for the easier healing of wounds and more effective immunological defence against disease and toxins.
 * Cortex Implants, which vary in function from simple memory circuit implants in the neurocortex intended to improve memory function to slim micro-cogitators that provide full computing abilities. Many senior Tech-priests use smaller implants of this type to preserve their mind and memories from the ravishes of time, and to lessen their dependence on fragile flesh. Cortex Implants of good quality are very rare and hard to produce, but provide the wearer eidetic memory and heighten their intelligence and ability to consume and correlate large amounts of data. Among the oldest Tech-priests only a few portions of the original brain tissue remain. The use of Cortex Implants is probably the primary reason why senior Tech-priests live far longer than the rest of the Imperial elite.
 * Electoos, metal circuits embedded in the epidermic skin of Tech-priests to allow them to consciously channel the bioelectricity generated by their own bodies. These can be used in combat, or to revive a recalcitrant Machine Spirit. Those who specialise in the use of these and become essentially a living electricity generator are known as Electro-priests or "Luminen".
 * Electro-grafts, which are similar to Electoos in that they are electric circuits embedded in the epidermic layer of the skin, but are distinct in their purpose. Electro-grafts serve as an interface for the Tech-priest with electronic machinery, particularly sources of digital data like Cogitators (computers). Given the right data-sources, a Tech-priest with electro-grafts can acquire many skills and much specialist knowledge instantly. One example of this are the pilots from the planet Glavia who have electro-grafts in the skin of their hands to enable them to interface with their starships with much greater efficiency.
 * Vox-casters and voice-synthesizers, which often replace the normal speech organs of more senior Tech-priests. The quality of the synthesized voice is highly variable, from stilted and unnatural mechanical voices only as good as or worse than twenty-first century voice synthesizer standards to voices that sound almost entirely natural. The Tech-priests themselves generally do not seem to care what they sound like as long as they are understood. The main benefit of a Vox-caster appears to be that it allows the priest to communicate in what is termed "Binary". Essentially, Binary consists of bursts of coded noise with a twittering quality that can be used as an extremely effective cant known only to other members of the Adeptus Mechanicus (even the Inquisition cannot translate it) or it can be used as a means of datafile transfer.

More uncommon but still occasionally seen Mechanicus cybernetic augmentations include the:


 * Mind Impulse Unit (MIU) - The MIU is a direct neural link between a human brain and a larger piece of external machinery allowing control by thought alone as if the machinery was a part of the human's body. These are most commonly found in massive pieces of technology such as Titans, Knights and starships, and very rarely in a normal Tech-priest. Some rare Tech-priests may use an MIU to control a shoulder-mounted weapon or similar device.


 * Binary Cortex - The Binary Cortex is created during an operation in which the brains of two Tech-priests are joined in one body. Usually used only when two Tech-priests study the same subject and otherwise align very well in their thinking.


 * Rite of Pure Thought - The Rite of Pure Thought is an operation which replaces the human brain's creative, emotional right half with a digital Cogitator (computer). This frees the Tech-priest of any remaining human emotion, basically turning him into a work-obsessed sociopath. However, this procedure is considered somewhat extreme even among the usually unsentimental Tech-priests.

Hierarchy of the Adeptus Mechanicus
"A man may die and still endure if his work enters the greater work, for time is carried upon a current of forgotten deeds, and events of great moment are but the culmination of a single carefully placed thought. As all men must thank progenitors obscured by the past, so we must endure the present, so that those who follow may continue the endeavour."

- The Chime of Eons, Garba Mojaro Techno-Magos of the Adeptus Mechanicus



The following is an example illustration of the organisational structure of the Adeptus Mechanicus in the modern 41st Millennium:
 * Omnissiah
 * High Lords of Terra
 * Adeptus Terra
 * Adeptus Mechanicus
 * Adeptus Ministorum
 * Cult Mechanicus - Disciples of the Machine God
 * Centurio Ordinatus - Engines of the Omnissiah
 * Collegia Titanica - God-Machines of the Titan Legions
 * Auxilia Myrmidon - Savants of War
 * Legiones Skitarii - Warriors of the Machine God
 * Legio Cybernetica - The Host Robotic
 * Ordo Reductor - Bringers of Blessed Ruin

Rank Structure
The Cult Mechanicus is ordered in a strong hierarchy, but details on this hierarchy's actual make-up are not always clear. Generally, more highly positioned Tech-priests are expected to have more seniority and knowledge than lower ones, and are consequently more theologically important as greater repositories of knowledge. A tentative mapping of this hierarchy, in order from highest to lowest, will follow below. It should be noted that specialists such as Genetors and Logis may not have any specific rank within the Cult as a group, but rather will be ranked as individuals.

The Adeptus Mechanicus hierarchy (from highest-ranked to lowest-ranked) is as follows: The Adeptus Mechanicus also recognises the following specialist ranks, which stand outside the standard hierarchy of the Cult Mechanicus and usually serve a related military role for the Mechanicus or its allies amongst the other Imperial Adepta. Titan crews and Space Marine Techmarines are listed last not because of their actual position within the hierarchy, but because of their relative separation from the rest of the Cult Mechanicus:
 * Fabricator-General
 * Magos 
 * Logis
 * Genetor
 * Artisan
 * Electro-Priest
 * Enginseer
 * Transmechanic
 * Lexmechanic
 * Runepriest
 * Menials
 * Servitors
 * Collegia Titanicus Princeps
 * Moderatus
 * Tactical Officer
 * Techmarine
 * Skitarii

Fabricator General
The Fabricator-General of Mars is the highest-ranking individual within the Cult Mechanicus (in his capacity as the Magos Mechanicus), and administers not only the Adeptus Mechanicus but also governs the planet of Mars itself as the recognised Imperial Planetary Governor. As befits his position, the Fabricator-General of Mars has a permanent seat on the council that runs the Imperium, known as the Senatorum Imperialis of the High Lords of Terra. Rulers of individual Forge Worlds are referred to as Fabricator-Generals as well, but only the Fabricator-General of Mars holds a seat amongst the High Lords of Terra, representing the leader of the Mechanicus as a whole.

Fabricator Locum
The Fabricator Locum is the second highest-ranking individual on the planet of Mars. The Fabricator Locum assists the Fabricator General with the governance of Mars, including the meeting of production quotas and ensuring the correct devotions to the Machine God are observed at all times. The most notable Fabricator Locum was Kane who sided with the Emperor of Mankind during the Horus Heresy and thus maintained at least some crucial Mechanicus support for the Loyalists.

Magos
A Magos is a master of a technological or scientific discipline, having devoted many years of service to the Omnissiah in that area of study. There are many specialist divisions within the Adeptus Mechanicus known as Divisiones. Magi from these are given a rank containing the specialisation of their Divisio, such as Magos Alchemys, Magos Biologis, Magos Technicus, Magos Logis, Magos Xenologis, Magos Lexmechanicus, Magos Orbologis, Magos Cybernetica, Magos Xenobiologis, Magos Astrologicus, Magos Digitalis, Magos Fabricator, Magos Genetus, Magos Physic, and possibly many more. There are two higher ranks within the Divisiones that are variations of the Magos, including Archmagos and Archmagos Veneratus. It is not known what the specific connotations of these titles are, though presumably they are indicative of greater seniority and experience.
 * Magos Explorator: Obsessed with the quest for knowledge, the senior Tech-priests who take on the mantle of a Magos Explorator search high and low across the galaxy for lost Standard Template Construct (STC) databases and ancient human scientific and technical knowledge lost during the Age of Strife. A breed apart from regular Tech-priests, any Explorator or member of his team will willingly walk into forgotten catacombs, even at the risk of death, for mere snippets of long-forgotten knowledge from the Dark Age of Technology. Many Magos Explorator command the Explorator fleets that continue to push outward the frontiers of the Imperium or even serve alongside Rogue Traders.
 * Magos Errant: Something of a jack of all trades, a Magos Errant studies several scientific and engineering disciplines, including chemistry, genetics, metallurgy and more. They are then attached to Rogue Trader fleets and other similar Imperial expeditions by treaty between the Adeptus Mechanicus and the individual Rogue Trader houses or the Imperium itself if the expedition is sponsored by the Adeptus Administratum. In return for the Adeptus Mechanicus' expertise in technical maintenance and science, the Magos Errant is allowed to study interesting sites the expedition comes near, transport sensitive materials and generally make use of the expedition's resources for the greater good of the Machine God.
 * Magos Juris: Magos Juris are those rare Tech-priests who choose to devote their minds to the study of the Machine God's will rather than the knowledge it embodies, removing themselves from the Quest for Knowledge in order to preserve it from the abuses of the heathen masses of Mankind. Amongst their colleagues on the Calixis Sector's Forge Worlds, these individuals are sometimes known as Magos Juris. They relentlessly pursue those who would commit tech-heresy or steal the secrets of the Adeptus Mechanicus. These Magos hunt down those who would employ unsanctioned technology or, even worse, operate technology without the blessing and oversight of the Adeptus Mechanicus. Magos Juris will go so far as to even take Mechanicus voidships into the depths of the Koronus Expanse to hunt down their foes. Worse still are those who smuggle technology, attempting to keep it from its rightful guardians. The fate of such men, when they are caught, is a grim one, for they are condemned to spend a far-expanded lifetime toiling without mind or will as a Servitor aboard the ship of the Magos that judged them, their minds obliterated and their bodies repurposed to serve the Machine God that they blasphemed against. There are many Explorator Tech-priests who speculate that the Magos Juris are, in fact, the agents of a secret order within the Adeptus Mechanicus known as the Lords Dragon. This ancient and powerful cabal is composed of specially-altered Archmagos said to exist deep within the secret inner circles of Mechanicus politics on the Calixian Forge Worlds known as the Lathes. Their task: to police the Mechanicus from within. However, little evidence can be found that proves the Lords Dragon exist at all, and that these Magos Juris do not simply operate on their own.

Logis
The accountants and mathematicians of the Mechanicus, the Logis are statisticians, analysts, actuaries and logisticians. They indirectly control a Forge World's resources. They can accurately predict almost anything with very small margins of error, making them extremely useful to anyone with an artillery piece or seeking to determine interstellar trade flows. Considered prophetic by some, the Logis are also very good at predicting future trends and forecasts and so they are often tasked by the Mechanicus with aiding the bureaucrats of the Administratum. Their dispassionate analysis is given great weight in decision making.

Genetor
Essentially geneticists, a Genetor is a Mechanicus scholar who studies all matters genetic and biological. Sometimes referred to as the Magos Biologis, Genetors number alongside the Logis, Artisan and Magos ranks of the Adeptus Mechanicus as members of its ruling Priesthood, possessing access to knowledge and resources far beyond that of the lesser Enginseers and Lexmechanics. A Genetor's field of study makes him distinct from the majority of Tech-Priests, their professional obsession with organic life often making them seem strange to their more mechanically-inclined brethren. Their interest in the organic not only pertains to the human form, but to the study of xenos life as well. The study of alien genetics, intended to better understand them and thus how to better slay them, falls to a sub-sect of Genetors collectively known as the Xenobiologists. Genetors are typically found accompanying Imperial or Rogue Trader expeditions to new or rediscovered worlds so that they can sample previously unknown species' DNA for its potential utility. Genetors also introduce common Imperial animals to a new colonial ecosystem, such as the Grox, a large reptilian animal that serves as a common food source on many Imperial worlds.

Artisan
Artisans are exactly what the name implies; they build and design pieces of technology for various purposes, from agriculture to war -- they are essentially the Adeptus Mechanicus' Corps of Engineers. Usually found with an entourage of Servitors, these Adepts command labour forces that could rival small armies in size. They are responsible for controlling the vast labour force of Servitors employed by the Adeptus Mechanicus for all of their labour needs on any given Forge World.

Electro-Priest
Electro-priests are techno-zealots devoted to the Cult Mechanicus, particularly the mysteries of energy, its flow through conductive bodies and the motivating spark it provides to Machine Spirits. They are known to be outfitted with a huge number of electoos. Electro-priests support other Tech-priests in battle. The most fanatical Electro-Priests are heavily modified to permit them to generate electrical energy within their own bodies, transforming them into living fonts of crackling power, destroying everything they touch before collapsing from the strain.

Enginseers
Enginseers are the technicians of the Cult Mechanicus, specially trained in maintaining and repairing machines. They are often seconded to the Imperial Guard in order to maintain and repair the armoured vehicles used by the Guard's regiments. Although most Guardsmen revere their vehicles enough not to risk annoying an Enginseer through "tinkering", some unique vehicles have been created from spare parts in time of need -- much to the chagrin of the Enginseers present. Among their fellow Tech-priests, Enginseers are afforded little respect, as their labours do not normally contribute to the Quest for Knowledge because they only maintain existing machines instead of building or discovering new technologies. Rather, they are viewed as lowly but essential cogs in the great machine that is the Cult Mechanicus. Most Enginseers have Mechadendrites attached to their back in order to facilitate their repair work.

Transmechanic
Transmechanics are technicians or service engineers who specialise in dealing with communications technology. By the nature of their speciality, Transmechanics are often called upon to serve in other Imperial organisations for extended periods of time, and often spend their entire existence aboard Imperial Navy vessels or on Imperial Guard bastion-worlds.

Lexmechanic
Also known as Calculus Logi, Lexmechanics are the librarians and scribes of the Mechanicus. Their purpose is to compile and rationalise data so it can be entered into a central Cogitator repository. They can work with a computer's speed and accuracy, assembling battlefield reports, economic statistics, planetary reports, and so forth. Like Transmechanics, Lexmechanics are commonly assigned duties outside the Adeptus Mechanicus assisting the Adeptus Terra.

Rune Priest
The Rune Priest's role is to inscribe runes and chant liturgies over machines as part of the Cult Mechanicus ritual of initiation. They are trained in the most arcane branches of scientific lore such as intuitive mechanics, speculation, and improvisation. Rune Priests are famous for their lateral thinking, which may be called upon when strict logic and standard procedures fail.

Menials
As their name suggests, Menials are the menial and unaugmented human labourers of the Mechanicus, used primarily for unskilled labour too complex for Servitors to economically perform. Menials are not considered true Tech-priests, but are usually indoctrinated with the beliefs of the Cult Mechanicus in a simplified form. Skitarii and, to some extent, new Tech-priests are often recruited from the ranks of the Menials on Mars and the other Forge Worlds.

Servitors
Servitors are mindless slave cyborgs, designed and programmed to perform menial, rudimentary or dangerous tasks for the Mechanicus and other elements of the Imperium like the Imperial Guard or even the Space Marine Chapters. There exists an endless variety of Servitors, from heavy mining Servitors to battlefield Gun-Servitors and elite Praetorian Servitors. A Servitor's biological components are obtained either by growing genetically-engineered human bodies artificially in culture vats, or by using the lobotomized bodies of condemned Imperial criminals or failed prospective Space Marines - all are subsequently augmented with mechanical limbs, computer uplink jacks and whatever electronic accessories are deemed necessary to facilitate their ordained tasks. As they cannot think for themselves since their higher brain functions have all been disabled, they are essentially nothing more than partially-organic robots which use a portion of a human brain as their central processing unit. Some Servitors can be installed with combat programs which enable them to function as unswervingly loyal bodyguards. In the battlefields of the game, they often form part of the retinues of Tech-priests, Techmarines and Inquisitors. These are seen on tabletop battlefields as Gun-Servitors, bearing heavy weaponry; Combat-Servitors, armed with close-quarters combat equipment; and Technical Servitors, which are intended to perform repairs and construction duties instead of fighting. Particularly large and heavily armed and armoured Servitors are referred to as Praetorian Servitors. Towering over even a Space Marine, Praetorians are created either from cybernetically-enhanced vat-grown genetically engineered giants or lobotomized Ogryns.

Skitarii
The Skitarii are the cybernetic infantry forces of the Adeptus Mechanicus. Skitarii regiments that go to war alongside the Mechanicus' Titans are equipped with various esoteric weapons of war. Part man and part machine, most Skitarii are cybernetically-linked to their personal weapon for increased performance. Skitarii are born into service either as natural-born human Menials of the Mechanicus who are cybernetically enhanced or in some cases as clones or vat-born humans who are cybernetically enhanced from the moment of their accelerated "birth". Skitarii train with their weapon until they are of the age to be sent to a war zone. To guarantee their undying loyalty to the Mechanicus they usually undergo various forms of psychosurgery to wipe their minds of both emotion and personality. The Skitarii do not simply crush their foes, but instead pitilessly blast them into bloody chunks of flesh. Even as they do so they record every tiny screed of battle data for later analysis. Just as the Skitarii exload the martial capabilities of the foe to their masters, the Tech-Priests inload their own programs into the Skitarii. It is usual practice for a legion's overseer Tech-Priests to monitor each battle from a scryer-ship high above. Floating in a sea of data, each adept sends battlefield commands down via data-tethers to the Skitarii on the planet below. In this way their soldiers can be remotely augmented, used as eyepieces, forced into suicidal engagements, or even possessed entirely. The ever-devout Skitarii see these incidents as the divine spirit of the Omnissiah entering them and acting through them to the betterment of the Imperium. To the Tech-Priests, their minions are little more than electric puppets jerking upon strings of pre-programmed impulse. The Skitarii Legions do not fight alone, for they escort the vast goliaths of the Centurio Ordinatus to war, and even march in the shadow of the god-machines of the Titan Legions. It is the Skitarii that bolster the battle robots of the Legio Cybernetica and they who act as bodyguards for Tech-Priests brave enough to take the field. Skitarii are often also referred to as the Mechanicus' "Tech-Guard". Some Mechanicus factions recycle the organic portions of the bodies of dead Servitors and Skitarii as raw material for the formation of new vat-grown Servitors or Skitarii. The Crimson Guard rival any of the armed forces within the Calixis Sector.

Classiarii
The Skitarii forces of the Adeptus Mechanicus take a variety of forms. On warships and Explorator vessels operating within the Koronus Expanse and the Calixis Sector, specially-programmed Skitarii are a necessity, for they serve as the members of boarding parties, security personnel and bodyguards where other forms of Skitarii would be impractical. Within the Mechanicus territories of the Calixis Sector, these warriors are known as Classiarii, a term of obscure meaning within the ancient traditions of the Calixian Mechanicus, believed to mean "mariners." Nigh-impervious to vacuum, fitted with thick, implanted armour, and equipped with an array of implanted weaponry designed for void combat and combat in the cramped enclosures of a starship, a Classiarius trooper is literally built for ship-to-ship combat.

Venatorii
The Venatorii were created in the wake of the War of Brass that devastated the Skitarii Legions of the Lathe Worlds, leaving entire Forge Worlds of the Calixis Sector with virtually no troops left. The reigning High Fabricator started a discreet rearmament drive throughout the Calixian Forge Worlds. The more military minded Tech-priests were moved into position to help replenish the fighting ranks. It took many years to bring this grand plan together, but once everything was in place, the High Fabricator found himself with a new force consisting of some of the best-trained and best-equipped troops in the Calixis Sector. Dubbed the Venatorii, the new hunters were a force that was to remain separate to the recovering Skitarii forces of the sector and act as the true elite of the Lathes. With their unique organisation and frightening red armour, the few outside of Mechanicus circles who were aware of their existence soon began to call them the Crimson Guard.

Techmarines
Techmarines (or Fraters Astrotechnicus as they are known to the Mechanicus) are chosen from the ranks of the Space Marine Chapters for their technological aptitude. After being inducted into their Chapter they are sent to Mars for many years of training, and when they come back, they serve the same role with their Chapter as an Enginseer does with the Imperial Guard, maintaining and repairing their Chapter's weapons, equipment, vehicles and space vessels. Although they are not officially part of the Adeptus Mechanicus, they are considered "honorary members" of the Adeptus Mechanicus by both their Chapter and the Adeptus Mechanicus itself. Their Power Armour is modified to accommodate their cybernetic enhancements and their armour's back packs are upgraded with several servo arms or Mechadendrites. Their armour is painted the rust red of the Adeptus Mechanicus, but their Chapter badge is retained and displayed on one of their shoulder plates, so as not to anger the Power Armour's Machine Spirit. Techmarines are able to wear full servo harnesses, which are huge harnesses armed with servo arms, Plasma Cutters, and Flamers. They are commonly accompanied by a full retinue of Servitors, including Gun Servitors, Combat Servitors, and Tech Servitors. They bear a Power Axe with the Adeptus Mechanicus Cog Mechanicum sigil on the head, as both a symbol of their office and as a weapon.
 * Iron Fathers - The Iron Hands Space Marine Chapter has closer ties to the Adeptus Mechanicus than is normal for the Adeptus Astartes, and like the Mechanicus their Astartes consider flesh to be weak, while cybernetic implants are more spiritually pure. The Iron Father fulfills the role of a Techmarine, a Chaplain and an officer in an Iron Hands company.
 * Iron Priests - The Iron Priest is the Space Wolves' equivalent of the Techmarine. Iron Priests look after the many technical systems in the Space Wolves' fortress-monastery on the world of Fenris, The Fang. They supervise engineering projects and all the other complex technical tasks undertaken every day. The skills of these grim and taciturn artisans are both respected and feared by their fellow Space Wolves, most of whom view the mechanical and scientific arts as a dark and frighteningly arcane sorcery.

Adeptus Mechanicus Minoris Ranks
Amongst the standard ranks of the Tech-priests there can be found several minor orders of Tech-adepts who are dedicated to more specialised functions. These Tech-priests are considered to belong to what are known as Minoris ranks within the larger, overall hierarchy of the Cult of the Machine. Some Minoris ranks include:

Acuitor Mech-Assassin
An Acuitor Mech-Assassin is part of an order of Adeptus Mechanicus, located within the Lathes in the Calixis Sector, that are dedicated to the art of death. They are only answerable to the Magisters Samadhi of their own order, and usually move according to their masters' will without scrutiny. The Acuity Set of the Lathes, less formally called the Mech-Assassins, are trained in the art of stealth, able to move within plain sight amongst the lay folk throughout the sector, hidden from scrutiny beneath heavy red robes. These executioners are pulled from across the Lathes and beyond, and instructed in secret fortresses scattered throughout the Calixis Secotr. Most candidates who are chosen have proven both faithful and capable of using the skills of the Adeptus Mechanicus to deadly effect. Through the mentally recorded data-tracts left by their founder, Magos Samadhi, the Mech-Assassins believe these cogitations guide them to the targets of their wrath and aid them in making short work of those who oppose the Lathes.

Reclaimator
The most-skilled and certainly least trusted of the Adeptus Mechanicus functionaries are the Reclaimators. It is their task to redeem raw materials from old and damaged systems, to scavenge parts and be tasked with the endless cycle of minor repairs needed to keep a starship flying or a hive’s infrastructure from collapsing under its own weight. By necessity, a Reclaimator’s skills begin to stray into a higher understanding of machinery and technology than most and many learn to worship the Machine God in a fragmentary and superstitious manner, marking them apart from others of the Mechanicus. Reclaimators themselves are often sent into dangerous or unsafe areas with little direct supervision, and they scavenge and salvage a good deal more than their masters know. As a result, most Reclaimators have a well-deserved reputation as suspicious, shifty characters who sell their skills and the items they retrieve or repair for a good profit on the black market. Many have links to criminal gangs and more than a few are willing to resort to robbery and even murder to build up their spoils if they think they can get away with it.

Secutor
Some Tech-priests are drawn to the path of the Secutor through a fascination with the unique and intellectual challenges warfare provides, while others feel themselves drawn to the intricacies and beauties of creation and destruction, or the sacred art of weaponsmithing. Others simply see this path as a means to an end, either for the protection of the Machine Cult, the furtherance of their own independent researches, or some other, hidden agenda. Regardless of the reason for their vocation, a Tech-priest skilled in such destructive arts as the Secutor is an invaluable ally for an Inquisitor, and makes for a singularly lethal Acolyte. The only downside to such an association is that the Inquisition can never be fully sure where the Tech-priest Secutor’s loyalties lie -- even more so than others of their kind -- or what ancient and dark secrets they may themselves possess.

Techsorcist
Created by Magos Eremor in the latter half of the 36th Millennium in response to the reappearance from the Warp of the Space Hulk Fatum Posterus, within the Calixis Sector the Techsorcists have long been on the frontlines whenever heretical technology has been found. Some Forge World Tech-priests develop an interest in analyzing corrupted Machine Spirits. Unusually for Tech-priests, Techsorcists are capable of intuitive thinking, speculation, and improvisation, and are famous for their lateral and often unorthodox process when strict logic and standard procedures fail. This is an invaluable tool for an Inquisitor trying to understand his foe’s weaknesses. In the service of the Inquisition, a Techsorcist performs all the typical tasks of a Tech-priest, but has a deeper understanding of how Chaos mutates and adapts technology. Within the Calixis Sector the ranks of Techsorcists have swelled as the demand for trained Daemon-hunting Tech-priests has grown. A trained Techsoricist, if not several, are in the employ of nearly every Ordo Malleus Inquisitor in the sector.

Collegia Titanica
The Collegia Titanica is the division of the Adeptus Mechanicus that commands the Titans -- colossal robotic combat walkers which are the most potent ground weapons capable of being deployed by the Imperium. The Collegia was one of the groups of the Adeptus Mechanicus that went over to the Warmaster Horus almost en masse alongside the Legio Cybernetica during the Horus Heresy. The name "Adeptus Titanica" is also used for the corps of Titans fielded by the Mechanicus.

The Collegia is divided into divisions, such as the Divisio Militaris, Divisio Mandati, Divisio Telepathica and the Divisio Investigatus. The most important of these divisions is the Divisio Militaris since it actually includes the Battle Titans, and is itself further divided into the Titan Legions: groupings of Titans such as the Traitor Death's Head Legion, the Fire Wasps Legion or War Griffons Legion. Each Titan Legion is commanded by an officer known as the Grandmaster who may also be the Princeps of the most powerful Titan in the Legion.

Each Titan is manned by a crew consisting of a single Princeps in command of the Titan, assisted by varying numbers of Moderati, Sensori, Steersmen, Tech-priests, Enginseers, and Servitors. The number of each is dependent on the type of Titan.
 * Princeps - The training of a Princeps begins at an early age and ends with eight years at the Collegiate Titanica on Mars. The cadets receive their uniforms and cybernetic MIU implants in the final year, before field-training starts with an attachment to a currently-operating Titan for observational tours. A Princeps commands his Titan through an MIU's (Mind Impulse Unit, see above) cybernetic link to the Titan's artificial intelligence or "Machine Spirit", controlling both his crew's actions and the Titan's movements through his thoughts. The Titan becomes an extension of its Princeps; when it is damaged, he feels pain, when victorious, he feels elation. This link grows so strong that his mental health will slowly deteriorate when unlinked from the machine. He can assume direct control of any system, though it is usually aiming and fire control that is taken. In a Warlord or Imperator-class Titan the Princeps is sometimes placed in an amniotic casket to provide full sensory immersion in order to control the truly massive Titan without difficulty. Regardless, Titans must have both a Princeps and a command crew to function. The Princeps' relation to the Titan is similar to that of a Space Marine within a Dreadnought cybernetic shell. However, Titans are capable of eventually developing their own sentient minds from centuries of experience. The cybernetic link in some cases gets so strong that the Princeps becomes neurologically integrated with the Titan, and cannot be removed until he dies of natural causes. A Princeps who commands a Legion of Titans is ranked as a "Princeps Maximus", though an entire Legion of Titans has very rarely been fielded since the Horus Heresy.
 * Moderati (sing. Moderatus) - The Moderati are the officers who comprise the command crew of a Titan that take the Princeps' orders and act on them, monitoring the Titan's auspices and scanners, firing the weapons and making sure all systems are functioning normally. Although they also have MIU links to the Titan like the Princeps, they cannot assume command nor can they interface directly with the Princeps' own dominant neural link, instead using their links solely to provide information about the Titan's state in battle.
 * Sensori (sing. Sensorus) - The third-ranking member of the bridge command crew, the Sensori is the Titan's Tactical Officer and controls and monitors all the sensory inputs of a Titan, from the aural sensors to the simple visual inputs. It is also his job to spot and acquire targets for the Moderati (or Princeps) to engage. They also deal with all Titan communications, decrypting or relaying vox messages to the Princeps' display screen on his command throne as necessary.
 * Steersman - The fourth member of a Titan's bridge crew, the Steersman controls the Titan's stability and is essentially the driver of the Titan.

Knight Houses
Thousands of standard years before the rise of the Imperium, Mankind reached out to the stars and settled many far away worlds. Among the apparatus of colonisation were formidable war machines known as Imperial Knights, which existed to protect the settlers from any threat. These small combat walkers are one-man versions of a Titan. However, a Knight is smaller and less capable in combat than even the smallest class of true Titan utilised by the Titan Legions, the Warhound-class Scout Titan. Knights normally deploy in squadrons comprised of several of these war machines. These ancient battlesuits stand thirty to forty feet tall, are protected by nearly impenetrable Ion Shields and armed with a devastating array of heavy weapons. Imperial Knights are colossal war machines that tower over the battlefield.

The strongholds constructed from the remains of ancient Terran colony starships are ruled by the descendants of the first human settlers of those far-flung worlds, mighty warriors who enter combat in their towering armoured battlesuits and who are sworn to protect and guard the Imperial citizens who inhabit their worlds. The descendants of the early pioneers who settled their respective worlds were found in the knightly houses of the Imperial Knights. Known formally as the Questoris Familia, these dynasties of Imperial nobility evolved from the need to protect the early human settlers of the Knight Worlds from indigenous species discovered on their alien planets. These proud and haughty warriors can trace their bloodlines back to Terra itself and are known as nobles. Over the millennia, the pilots of these massive war suits have established a rich culture, with noble houses each sworn to the defence of their homeworld, and bound by oaths of fealty to the Golden Throne of Terra and the Adeptus Mechanicus of Mars.

Centurio Ordinatus
The Centurio Ordinatus, a section of the Mechanicus' Divisio Militaris, is the Adeptus Mechanicus organisation responsible for the development, maintenance and operation of the mighty Ordinatus war machines. Every individual Ordinatus is a unique construction and named for the Imperial world on which it was first employed or built. Each Ordinatus is a unique weapon that is designed for a specific purpose or for a particular battle. This explains why the Ordninatii Tech-priests that operate these massive war machines of the Machine God are configured using special augmetics to aid their intended purpose.

Legio Cybernetica
The Legio Cybernetica is one of the oldest sub-branches of the Adeptus Mechanicus and is responsible for deploying fully autonomous robots for both combat duties and support tasks intended to aid Imperial armed forces in the field. The Legio Cybernetica can trace its lineage the time before the birth of the Imperium of Man when Mars was the capital of an independent interstellar empire ruled by the Tech-priests of the Cult Mechanicus. Its members regard themselves as an elite within the ranks of the Mechanicus, as they have a long history of serving the will of the Emperor of Mankind. However, many of those within the Legio broke faith with the Emperor during the Schism of Mars, siding with the traitorous forces of the Warmaster Horus and fighting alongside his Traitor Legions throughout the Horus Heresy. When this conflict ended, the Traitor cohorts of the Legio Cybernetica fled into the Eye of Terror, where they remain to this day, warped and twisted by their exposure to the power of Chaos. The remaining Loyalist elements of the Legio Cybernetica pledged themselves anew to the Imperium, and its members took binding oaths of loyalty more terrible than any taken even by the Astartes. Over the millennia since the Heresy, the Legio Cybernetica has regained the respect and admiration of the rest of the Adeptus Mechanicus as well as the other myriad Adepta of the Imperium.

Collegiate Extremis
The Collegiate Extremis is the judicial branch of the Adeptus Mechanicus. It is similar to the Adeptus Arbites in function: traitors to the Omnissiah are prosecuted and their crimes analysed. At its head is the Lords Dragon, an ancient cabal orchestrating the Collegiate, perhaps of Archmagi Veneratus of whatever divisiones of the Mechanicus serve in the Collegiate. The main leaders of the Collegiate Extremis would, in theory, be on Mars, and each Forge World would have a Lord Dragon of its own to command the local members of the collegiate, but this is based on circumstantial evidence. The Collegiate's will is enforced on Forge Worlds by attached Skitarii Provosts, as they are known, and the Magos Juris carry out their will across the galaxy. In many ways the Collegiate Extremis serves as the Mechanicus' own internal variant of the Imperial Inquisition.

Auxilia Myrmidon
Within the Calixis Sector, the undisputed centre of power within the Lathe System is the Auxilia Myrmidon, a seeming sub-organisation of the Skitarii Legions, composed of elite Tech-priests known commonly as the Siege Engineers or the War Savants. This Mechanicus sect exists to study the art of destruction with the ardent fervour that their fellows mighty apply to the creation of machinery or the recovering of lost archeotech. Legend has it they came to the sector during the earliest days of the Angevin Crusade (322-384.M39) for reasons of their own, and have since remained to defend the Cult Mechanicus’ possessions there. Myrmidons are expert killers, weapon masters and destroyers. At the behest of the ruling Archmagos of the Forge Worlds, they are sent to accompany Explorators in investigating finds in the most dangerous sectors of space and retrieve the most hazardous xenos-specimens, whilst others are tasked to hunt down Mechanicus Renegades accused of the foulest techno-heresies and terminate them with extreme prejudice. A Secutor is the first rank in the Auxilia Myrmidon presumably as the standard trooper, and is also the first Adepts Minoris rank in the Divisio Mandati. other members of the sect operate their vehicles as drivers, known as Myrmidons, who also serve in the Ordo Reductor. A platoon leader of a unit of Secutors or Myrmidons is known as a Centurius. A Tribune (commonly known as a lieutenant in the stand Imperial armed forces) commands a century; a Magnus (also known as a captain, and perhaps an Adept Majoris) commands a cohort, with a Colonel-priest having control of a battalion and a Magos Commander in charge of an entire Legion of the Auxilia Myrmidon.

Divine Light of Sollex
The Auxilia Myrmidon is not the only militant Mechanicus faction in the Calixis Sector, and since the 8th century of the 41st Millennium a highly mystical tech-sect based at the forge facilities on the Death World of Haddrak in the northern rim of the Adrantis Nebula has grown to prominence and increasing power. The Divine Light of Sollex, as they call themselves, are zealots in the Machine God’s cause, as coldly fanatic and savage in their way as any Redemptionist of the Imperial Creed. To them, the preservation of the arcane mysteries of the Machine Cult from those who would misuse them are of far greater worth than petty wealth, worldly power or the lives of their fellow men, or even other members of the Cult Mechanicus.

Disciples of Thule
The Disciples of Thule are another sect of the Cult of the Machine that operates out of the Calixis Sector. Their overall spiritual leader and guide is the Archmagos Paracelsus Thule. Many centuries old, Thule’s fleet, which disappears out beyond the edge of Mankind’s domain for decades at a time, is vast and many Explorator Adepts and Magos have served under his tutelage over the years, passing on his teachings to their juniors in turn. Thule’s instruction centres on identifying pre-Imperial human technologies and sets the goal of finding the relics of Mankind’s glorious past above all other concerns and risks. This lack of caution makes Thule and those following him something of a radical faction within the Cult Mechanicus, but a powerful and influential one in the Calixis Sector. Thule’s disciples centre their studies entirely on analysis and investigation, valuing the acquisition of knowledge above all other concerns. They disdain physical confrontation and are often so wrapped up in cogitation they fail to notice what is in front of them. Some Inquisitors appreciate this curiosity in their Tech-priests, finding it preferable to the narrow thinking and conservatism many others of their kind demonstrate, even though curiosity almost always carries its own dangers.

Ordo Reductor
The Ordo Reductor is a sub-organisation of the Adeptus Mechanicus that developes, manufactures and operates siege weaponry. There is a sizable portion of the Ordo Reductor staffed primarily by Myrmidons of the Auxilia Myrmidon. It is claimed that these Myrmidons are located on the Mechanicus fiefdom in the Calixis Sector known as The Lathes; the Myrmidons are masters of the mysterious Ordo Reductor, and are said to be towering and fearful figures decked out in blood-red and black robes, bearing the forbidden weapons of a bygone age. Even wilder legends speak of this place as the home of mech-assassin covenants and the dread Magister Samadhi -- beings whom most Magos consider no more than a dark myth. Some even speculate that the Panopticon’s rulers are members of a secret order known as the Lords Dragon, an ancient and powerful cabal of Archmagos tasked with policing the Mechanicus itself.

Duties Within the Imperium
Besides scientific research and maintaining the Imperium's machines, there are many important duties that the Adeptus Mechanicus performs in order to keep the Imperium of Man functioning on a day-to-day basis. These include:
 * Caretakers of the Generatorium: The advanced technology of the Imperium requires power and this power is supplied by Generatoriums, large, nuclear fusion-based power plants. The creation and operation of the Generatoriums (power plants) containing the Generatorium are the function of the Adeptus Mechanicus and the information behind their operations and construction are closely guarded from outsiders.
 * Caretakers of the Genetorium: Like the Generatorium, the Genetorium is vital to a planet's survivability. The Genetoriums provide a list of all plants and animals that are either on a planet or will be introduced to the planet to make it habitable by Mankind. A Genetorium is normally run by a Magos Biologis and plays a vital role in the Inquisition's activities. Their duties also extend to searching for genetic impurities in baseline human populations and in the hunting down of dangerous human mutants like rogue psykers.
 * Caretakers of the Librarium: All of the knowledge in the Imperium is stored in the vast Librariums of Terra and Mars. Along with the Administratum, the Tech-priests store, guard, and reproduce what knowledge they can attain. In the Age of the Imperium where stagnation is the rule, knowledge has truly become power.
 * Caretakers of the Manufactorium: As with the Librariums, the Tech-priests administer and protect the manufactoriums of the Forge Worlds that ensure that the Imperium is provided with the goods and machines that ensure its survival.
 * Caretakers of the Astartes: All Space Marine Chapters are expected to pay a tithe of 5% of their gene-seed every year to the Adeptus Mechanicus so that the Mechanicus' Tech-priests can monitor the health of each Chapter and facilitate the Founding of new Chapters from existing gene-seed lines whenever the High Lords of Terra decree that the Imperium has a need for new Chapters of the Adeptus Astartes.