Space Marines

In the fictional universe of Warhammer 40,000, the Space Marines, also known as the Adeptus Astartes, are superhuman warrior-monks who fight for the Imperium of Man. They wear mechanised suits of armour and have modified genomes that grant them superhuman strength and endurance. Some Space Marines have betrayed the Imperium and serve the Gods of Chaos, and are thus known as Chaos Space Marines.