Power Armour - Mark X Power Armour: The Mark X is the latest development in power armour design developed and forged on Mars itself. This latest pattern of power armour was developed for the long-awaited project commissioned by the Ultramarines primarch Roboute Guilliman himself 10,000 standard years ago after the Horus Heresy -- to craft a new breed of transhuman warriors.Developed over 100 standard centuries, utilising long-forbidden technology of ages past and their own sagacity, the Priesthood of Mars developed the Primaris Space Marines. This new breed of transhuman hero is bigger, more physically powerful and possesses faster reaction times than their original Firstborn Astartes counterparts.These new warriors are the next step in the evolution of the Emperor's angels of death. They have been forged as reinforcements for the Imperium's beleaguered elite forces as their enemies close in for the kill in the wake of Abaddon the Despoiler's 13th Black Crusade and the birth of the massive tear in reality known as the Great Rift.To aid them in battle, these gene-forged warriors are equipped with the most advanced arms, armour and equipment, including Mark X Power Armour, which combines all the most effective elements of ancestral power armour technology. These suits are currently worn by all Primaris Space Marines who have led the way in Guilliman's Indomitus Crusade to retake the galaxy from Mankind's many foes.The Mark X is intended to be a modular design of power armour, more versatile than its predecessors and drawing upon the most advanced patterns of the past, particularly the Mark IV Maximus and Mark VIII Errant Patterns. Mark X Power Armour does not have a single appellation like earlier variants of Astartes battle-plate (such as Mark VII Aquila Armour).Instead, different variants of the same mark are worn depending on the Primaris Space Marines' combat role. Regardless of its pattern, Mark X armour is designed to attach to a special undersuit worn by each Primaris Marine, enabling it to be fitted in different configurations according to need.Intercessor Squads, Assault Intercessor Squads, Desolation Squads and Hellblaster Squads, for example, wear Mark X Tacticus Power Armour, which is the standard, multi-role pattern of the battle-plate used by most Primaris Marines.Inceptors, however, wear the Mark X Gravis variant which possesses a built-in Jump Pack, retractable helmet shield, and a more robust, reinforced ceramite structure intended to withstand the forces of an assault from low orbit through a planetary atmosphere. The heavier build of Mark X Gravis armour is also favoured by Eradicators and Heavy Intercessors, who need the enhanced protection to better carry out their tactical roles.A third variant is Mark X Phobos Armour. This suit's lighter-weight ceramite and streamlined design allow for greater mobility, and its servo-motors are engineered to be completely silent. This variant serves those Primaris Marines who take on the role of Reivers, Incursors and certain Vanguard Space Marines like Infiltrators and Eliminators. These Astartes are ruthless killers, trained in covert operations who operate behind enemy lines as saboteurs, assassins and infiltrators. All who wear the Mark X Phobos variant depend on stealth and secrecy to accomplish their missions.Eliminator Squads utilise an even more stripped-down version of the same Phobos armour pattern, allowing them to operate with maximum stealth as they stalk their prey.Like all Primaris battle-brothers, officers of the Chapter fight in Mark X Phobos pattern armour whenever the tactical situation merits it. Primaris captains and lieutenants of all companies will lead missions into the enemy's heart wearing such battle-plate, commanding equally silent warriors with undetectable battle cant.Primaris Librarians replace their standard Mark X Tacticus Pattern raiment with Mark X Phobos armour when utilising the most subtle and illusory of their psychic powers, which rely on misdirection.Vanguard Marine Suppressor Squads are clad in a fourth variant -- Mark X Omnis Armour -- which is a blend of the heavier Mark X Gravis configuration and the lighter Mark X Phobos versions favoured by other Vanguard Space Marine units. The Omnis Armour possesses a built-in Jump Pack similar to the Gravis variant. The result is a comparatively lightweight but extremely durable suit of power armour that can easily tolerate the extreme stresses of grav-drops, jump insertion operations and the thunderous recoil of portable heavy weaponry. Although they wear similar suits of Mark X armour as Inceptor drop troops, Suppressors do not strike into battle from low orbit like Inceptors, instead relying upon their Jump Packs and Grav-Chute arrays to manoeuvre into an enfilading position where their weapons tear through heavily armoured enemies and shred light vehicles.All variants of the Mark X also allow for the utilisation of a new breed of Astartes weaponry, such as Mark II Cawl Pattern Bolt Rifles, Assault Bolters, Boltstorm Gauntlets, Auto Bolt Rifles, Plasma Incinerators and many others.