Mark VII Aquila Power Armour - The Space Marine depicted to the right wears a suit of Mark VII Aquila Power Armour, sometimes called "Armorum Impetor" or "Aquila Armour", although with this particular set depicted here the Chapter Artificers have replaced the breastplate with one converted to fit from an older suit of Mark V Heresy Power Armour, with the reintegration of the chest Aquila and the suit's power cables relocated to the interior. All of the established marks of Space Marine power armour have many variants. Some do not contain all of the original features of that design, while others, as in this case, utilise parts recovered from older marks of armour. Power armour is usually personalised by each Space Marine who wears it and is always revered as a sacred relic of the Chapter. Suits or parts of suits can be ancient, dating all the way back to the time of the Great Crusade or the Horus Heresy, and are often reused many times. Like all power armour, the suit depicted here contains an exoskeletal array of actuators and fibre bundles which replicate the muscular commands via a cybernetic neuronal interface that literally plugs into the wearer's spinal column through the Astartes gene-seed organ implant known as the Black Carapace and connects to his central nervous system. Through this interface, the heavy armour becomes a literal part of the wearer and responds to his movements and mind-impulse controls without adding any encumbrance, despite the armour's weight when inert. Whilst appearing heavy and unwieldy, this Space Marine will experience little weight gain and retains almost his full array of unarmoured movement and agility. The muscle fibre bundles and actuators actually increase the already considerable genetically-enhanced strength of the wearer, allowing him to lift heavier loads or jump greater distances than when not wearing the suit. The outer, armoured layer of this armour consists of shaped adamantium and plasteel plates, encased in a ceramite ablative layer. The armour is shaped to deflect as well as to absorb the energy of incoming blows. The shoulder plates of this suit contain small, auto-responsive plates which burst outwards in a micro-explosion to counteract the energy of an incoming attack and prevent penetration. Beneath the armoured protection lies the internal workings of the suit's life support and combat systems. The armour contains numerous life support systems. The lower back holds a liquid high-protein food store, which when combined with the Space Marine's genetically-enhanced metabolism produces no waste and keeps a Space Marine's body functioning without the need for any other nourishment. During combat, there is no need for this Astartes to stop to eat or drink as the suit provides all of his needed nutrition and hydration. The suit also has its own back-up power supply and a solar array to recharge this supply, meaning the suit can continue to operate for a short time without its backpack. The suit contains a de-tox injector with five doses and a biomedical cogitator system that can determine when the injector's potent cocktail of stimulants and cellular regenerators is needed. These will counteract the effects of most common poisons and other toxins. The injector can also be used for stimulants and, in contravention of Codex Astartes proscriptions, some Chapters have used it to administer combat drugs. The palm of the gauntlets contain sensors to read information from the weapons held in the hands and to pass genetic identification codes to the weapons. Without the proper code, a Space Marine's bolter or other weapon will not function. The soles of the boots are magnetic, as well as being constructed of a micropore adherent compound, meaning a Space Marine will not slip on even the slickest of surfaces or in zero-gravity. The magnetic function can be turned off or on as needed by the Astartes through his mind-impulse link with the suit. Backpack - The main power source for the suit of power armour is located in the suit's backpack. This highly-efficient sub-atomic microfusion reactor core provides the power for all internal systems. The suit does contain a reserve power supply and a back-up micro-solar panel array in case of emergencies. The reserve power source can be recharged via the solar panel, and when fully charged should provide enough power to last for a solar month (as long as all non-vital systems are disabled) without the need for major maintenance or resupply. Thermal waste dissipators form the characteristic nozzles on either side of the backpack. This thermal waste can also be used for limited maneuvering in zero-gravity. The backpack also contains the suit's supply of oxygen and an air purification system that allows the wearer to breath in toxic or vacuum environments. Combined with the Space Marine's own Multi-lung organ implant, the wearer can operate unhindered in any atmosphere, as well as underwater and in hard vacuum. Air intakes are also located on the backpack. The lower part of the backpack is the armour's temperature regulation system. In combat, with the suit functioning at maximum capacity, heat can build up quite rapidly. Settings for heat control can be adjusted depending upon the environment the suit is operating in, obviously retaining more heat in frigid conditions or the void of deep space than in tropical or desert conditions. In planetary environments, the suit's internal cogitator will always optimise conditions to match the world's mean average temperature. Within the armour, the wearer will experience only minor temperature fluctuations as the suit maintains the correct temperature to keep the Space Marine operating at peak physical efficiency in any environment. Helmet - This Space Marine's upgraded Mark VII Aquila Pattern helmet contains most of the suit's actual combat-related systems. All of these helmet augur and auspex sensor and diagnostic systems are referred to by a single term -- "Auto-senses." Features include the primary, thought-activated, vox-link. This Space Marine's helmet also has an additional vox-booster and scrambler attachment, intended to block enemy attempts to intercept Imperial communications channels. The right eye also includes a range-finder, targeter and target recognition friend or foe upgrade to the helmet's basic suite of Auto-senses. Such equipment is most common in Devastator Squads, but is not limited to them. The visor displays tactical information. This includes maps of a given area, waypoint markers, a compass, as well as called-up data on the Astartes' own weapon, passed through the weapon's grip and the palm of the gauntlet. Primarily this data would include an ammunition counter display, but also gives emergency warnings about overheating and weapon jams. This helmet also incorporates visual magnification up to x4, which when combined with the wearer's Occulobe organ implant means a Space Marine can see clearly in most combat conditions. The visor also includes basic infrared scanning and night vision capabilities. Through his Auto-senses, the Space Marine can access full diagnostic information on the armour's operating status and absorb data about the external environment, such as atmospheric composition, barometric pressure, the presence of harmful chemicals and toxins, etc. Diagnostic sensors are positioned in various places on the suit to scan for such information. The helmet can also display biological information about the Space Marine himself, including heart rate (for both hearts as Astartes possess two), blood pressure, toxin levels, the workings of the Larraman's Organ or Oolitic Kidney implants, and assessments of the degree of physiological damage caused by wounds. These bio-status read-outs can also be broadcast via vox to Space Marine command units for monitoring during battle and training. As well as containing the suit's communications array, the helmet's ear pieces screen the wearer from sonic attacks and includes amplifiers to the Space Marine's Lyman's Ear implant, giving sharper hearing and allowing the Space Marine to filter out or enhance specific sounds. The Lyman's Ear also means a Space Marine is unlikely to become dizzy or disorientated, even when hit by strong blast waves. The grill on the helmet contains a microphone, allowing the wearer to talk normally through the helmet or amplify his voice over a short distance, which is sometimes useful during the din of battle. If the external environment is conducive to Human life, the grill can open to allow the wearer to breath the ambient atmosphere rather than use the air purification equipment or the suit's internal air supply. Finally, the helmet visor incorporates an auto-reactive photochromatic visor that protects the wearer from light level changes, dimming or blacking out completely should the wearer be exposed to sudden, dazzling light. Relics and Insignia - Strapped to the left shoulder plate are two engraved skulls. These are sacred relics which may belong to former owners of the armour or to fellow squad members of this Space Marine who were killed in battle. They may also be the skulls of worthy foes that this Astartes now carries as trophies of his victory. Many such sub-cults exist throughout the Space Marine Chapters, with each following its own rituals and traditions, often inherited from the culture of the Chapter's primary recruitment world. These relics will be gifts from the company Chaplain, rewards for exceptional dedication or bravery in battle. The plastron chest eagle or Aquila is worn as the symbol of this Space Marine's loyalty to the Emperor of Mankind. Aquilas are commonly worn on the chest plates of all Space Marines since the Horus Heresy, when the Emperor decreed that this honour was now available to all of the Space Marines who had remained loyal to the Imperium rather than just to the Astartes of the corrupted Emperor's Children Legion, who had joined Horus in his rebellion. The Chapter badge is commonly worn on the left shoulder plate and is sometimes repeated on the right knee-plate. The right shoulder plate commonly bears the Astartes' squad designation markings (a large arrow in the case of a Tactical Squad or other battleline unit) and the squad number in High Gothic numerals. Underneath this is a name scroll. This personal cloth scroll bears the Space Marine's name, and like all the non-Codex Astartes-approved additions to this armour, will have been donated by the company Chaplain to reinforce the Space Marine's faith and morale. As a Veteran, this Space Marine bears his own personal heraldry; a shield pinned to the right shoulder plate, bearing the symbol of a sun. The meaning of this is unknown, but it may hark back to a time before this Space Marine was recruited. Finally, this Astartes' bolter bears twelve kill markings scored onto the weapon's case, probably earned on previous missions. Bolter - As a member of a Tactical Squad, this Space Marine's primary weapon is the bolter, also sometimes called a boltgun. This weapon is a standard Mark IV Pattern Bolter with a sickle magazine containing twenty bolts. Each bolt is a .75 calibre, rocket-propelled, armour-piercing, mass-reactive, explosive projectile. Bolts explode after first penetrating a target and are capable of destroying small vehicles as well as having a horrific effect upon infantry. The weapon has single shot and semi-automatic settings, firing a burst of three bolts in quick succession. The bolter also includes a palm print sensor for genetic identification coding and can only be activated by this specific Space Marine's genetic signature. Grenades and other Wargear - In addition to his bolter, this Space Marine carries other combat equipment or wargear. Hanging from his utility belt are two Frag (Fragmentation) Grenades. He also carries three spare magazine pouches for his bolter. The cylindrical object hanging from his back, below the backpack, is harder to identify. This may well be a shaped demolition charge for destroying fortified emplacements. Not visible here, the Space Marine will also be carrying Krak Grenades effective at penetrating heavily armoured targets and as a Veteran may also possess a Mark II Macragge Pattern Bolt Pistol as a secondary weapon. Combat Knife - The Space Marine's last weapon, and his only close combat weapon, is his Astartes Combat Knife. This highly ornate piece, bearing a dedicational Aquila crossguard, heavy pommel and a 50 centimetre-long blade, would be a full-bladed sword in a mortal's hands. Used for hand-to-hand combat, it is kept honed to a keen edge. It is also used during the Chapter's ceremonies and rituals and will have been blessed by a company Chaplain before battle. It is not a bayonet and cannot be fitted to the Mark IV Bolter as it must be wielded by hand. Hand-to-hand combat and knife-fighting is part of all Space Marines' basic training, instilling skills which will continue to be honed throughout a lifetime of service to the Emperor.

Mark X Power Armour does not have a single appellation like earlier variants of Astartes battle-plate (such as Mark VII Aquila Power Armour). Instead, different variants of the same mark are worn depending on the Primaris Space Marines' combat role. Intercessor Squads, Hellblasters and many Primaris officers, for example, wear Mark X Tacticus Armour like the suit shown to the right. It offers substantial protection and allows the wearer great mobility. Inceptors, however, wear the Mark X Gravis variant, showcased below. Elements of several earlier marks of Astartes power armour are recognisable in the various incarnations of Mark X armour. Sloped pauldrons, or shoulder plates, are used to deflect enemy fire. Primaris Space Marines are trained to use these angles to deflect shots. The thickest layer of ceramite is over the chest-plate, protecting not just the power armour's cables, but also most of a Primaris Space Marine's vital internal organs. A Dominus-class Purity Seal. The Mark II Cawl Pattern Bolt Rifle is wielded like an extension of a Primaris Space Marine's weaponised physique. An Absolutis ballistic-appeasement autoreliquary allows for autosanctification of Bolt Weaponry in combat. Flanged poleyns (kneeplates), made of melded plasteel and ceramite, provide extra protection over vulnerable joints. Greaves. These incorporate gyroscopic stabilizers and can magnetise the soles of the armour's boots, allowing Primaris Space Marines to walk on metal surfaces in treacherous terrain, including zero-gravity environments -- essential for boarding actions in the cold battlefield of space.

Power armour has been in use since before the Age of the Imperium, worn by the techno-barbarians that dominated Terra during the Age of Strife. It was also worn by the early genetically-engineered warriors that formed part of the Emperor's retinue during his unification of Terra towards the end of the Age of Strife in the 30th Millennium. In the armour's earliest incarnation, the suit was not fully sealed or life-supporting, this being unnecessary while its use was still confined solely to Terra. Over the history of the Imperium, power armour has developed into many different forms. Need, circumstances and the recovery of new materials and lost advanced technology, so-called archeotech, has shaped the armour's evolution. The common image of the Emperor's Space Marines is of mighty warriors arrayed in imposing suits of armour made of ceramite plates, adorned with a bold two-headed Aquila on their chests. This pattern of power armour, dubbed the "Aquila Pattern," is the one most often seen among the Firstborn Space Marines, but is in fact just one of eight distinct "marks" seen on battlefields over the millennia. All the recent types are still in active use, to varying degrees, by the existing Chapters of the Adeptus Astartes. Working examples of the older marks, meanwhile, are extremely rare and valued as a physical link to the glorious history of the Space Marines. Older patterns of power armour are reserved for ceremonial guards or used as the badge of office of high-ranking officers. It may be noted that there appears to be a steady improvement in engineering and design through the years. However this progress is not because of any particular invention or creativity. Rather, the changes were triggered by the gradual rediscovery of knowledge and materials from the Age of Technology, as the Emperor's Great Crusade reconquered the galaxy. Following the end of the Horus Heresy, the genral stagnation of Imperial culture and technology meant that the advancements in power armour technology have been few and far between.