The Iron Warriors Armor is a power armor set in Space Marine multiplayer. It is a DLC item available to players who pre-ordered Space Marine from Best Buy.
Before their betrayal of the Imperium and the Emperor during the Horus Heresy, the Iron Warriors Legion of Space Marines were the Imperium's finest tacticians and siege-masters, second only to the Imperial Fists whom the Emperor favored over them. This fierce rivalry led to an intense hatred between the two Legions, especially between their Primarch's Perturabo and Rogal Dorn, leading the Iron Warriors to sided with Chaos in the ancient Horus Heresy and turn their skills against Humanity. The Legion's warsmiths now blend ancient technologies with daemonic gifts, creating terrible war machines and fearsome weapons.