A new breed of transhuman Space Marines in Warhammer 40K, developed across the span of ten thousand standard years by Archmagos Dominus Belisarius Cawl on Mars on the order of Primarch Roboute Guilliman. Cawl used the genetic template of the original Space Marines created by the Emperor for His Great Crusade as the starting point for the development of the new Astartes. Primaris Space Marines are bigger, more physically powerful and possess faster reaction times than their original Astartes counterparts.
The way to different them from a regular Space Marine is their height and equipment, wearing the Mark X Tacticus Pattern Power Armour.
