Space Marine power armour has a long and glorious history, having its origins in the long-forgotten time before the Emperor's unification of Mankind on Terra during the Unification Wars fought by his legions of gen-enhanced pseudo-Astartes, known as the Thunder Warriors.

8.11 Marks I, II, and III Tactical Dreadnought ArmoursДЄ comparison of the size classes of various Adeptus Astartes armours as displayed by the Ultramarines from left to right, a Mark V Castraferrum Pattern Dreadnought, a Centurion, a Terminator in Indomitus Pattern Terminator Armour, a Space Marine in Mark VII Aquila Power Armour, and a Scout Marine in Scout Armour.

8.10 Vulkan's Master-crafted Tactical Dreadnought Armour.

8.9 Arkonak Pattern Tactical Dreadnought Armour.

8.8 Saturnine Pattern Tactical Dreadnought Armour.

8.7 Aegis Pattern Tactical Dreadnought Armour.8.6 Tartaros Pattern Tactical Dreadnought Armour.8.5 Gorgon Pattern Tactical Dreadnought Armour.8.4 Allarus Pattern Tactical Dreadnought Armour.8.3 Aquilon Pattern Tactical Dreadnought Armour.8.2 Cataphractii Pattern Tactical Dreadnought Armour.8.1 Indomitus Pattern Tactical Dreadnought Armour.Within a warband of Chaos Space Marines, Chaos Terminators enforce the will of their leader and always claim the most valuable spoils of any victory. Chaos Terminators will often act as the personal guard of such an esteemed Champion. So scarce is Terminator Armour among the Heretic Astartes that sometimes an Aspiring Champion can only claim a suit for himself by killing the current wearer, whether in ritual combat or by more devious means. However, lacking the genetically-engineered subdermal Space Marine organ known as the Black Carapace, Inquisitors are unable to neurologically interface with the armour, and generally find its bulk much more cumbersome than a Space Marine does.ДЄmongst the Traitor Legions that still reside within the hellish realm known as the Eye of Terror, only aspiring Chaos Champions or Chaos Lords who stand in great favour to the Ruinous Powers wear Terminator Armour. Notably, members of the Ordo Malleus in particular have been known to favour suits of Terminator Armour. Less frequently, high-ranking members of the Inquisition have been known to wear a form of Terminator Armour sized for an ordinary Human occupant. It is said that the Crux Terminatus behaves as a ward that augments the Terminator Armour itself, capable of turning aside blows that would threaten even a war engine. The elite 1st Company of most Space Marine Chapters uses Terminator Armour extensively, and only those Astartes who earn the Crux Terminatus, a special badge of honour said to contain a fragment of the power armour worn by the Emperor of Mankind when he defeated Horus at the end of the Siege of Terra, are permitted to wear it. Offensively, it provides the strength to maintain mobility while serving as a solid heavy-weapons platform in open-field combat. Its advanced composition allows the wearer to survive hits from firepower that could penetrate even the armour of a tank, and it is the heaviest combat armour in any Imperial arsenal, able to withstand tremendous punishment. Terminator Armour is an incredibly durable suit comprising an outer shell of heavy-gauge ceramite plasteel composite plates, mounted on an adamantium exoskeleton with servo-assisted interfaces that integrate with an Astartes' own neurological and muscular systems to enhance movement. Massively thick armour plates and powerful servo-muscles drive these defensive shells, and only the best and bravest of a Space Marine Chapter may don this ancient and sacred battle-harness.ДЄ Black Legion Chaos Terminator in Indomitus Pattern Terminator Armour. When battle calls for durability and protection over agility, it is to revered suits of Terminator Armour that the Space Marines turn. These suits are primarily utilised in situations where standard Space Marine power armour does not provide enough protection for a warrior.ДЄn Imperial Fists Assault Terminator in Indomitus Pattern Terminator Armour with Thunder Hammer and Storm Shield.

Terminator Armour, officially designated Tactical Dreadnought Armour, is an advanced form of powered combat armour developed for close-quarters melee and ranged fighting done by Space Marine Terminators, for whom slaying power is more important than maneuverability. An Ultramarines Terminator wearing Indomitus Pattern Terminator Armour with Power Fist and Storm Bolter.

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