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The '''Space Marines''', aka '''Adeptus Astartes''' and also as ('''Angels of DeathSpace Marines''', ) are, without any doubt the best military force the Imperium has to offer. Its warriors of mankind. They are chosen from the best examples of Mankind throughout the best, immensely stronger, fasterImperium, who are then indoctrinated to become absolutely dedicated and hardier than an average humanmerciless. During the [[Great Crusade]] full twenty [[Space Marine Legion]]s, each one of them sporting more or less 10,000 battle-brothers, They are genetically re-conquered many thousands engineered to give them superhuman abilities. They are capable of Human worldsspitting acidic venom, saving Humanity from all but certain extinction. Their efforts, strugglesabsorbing the memories of the dead by eating their flesh, and sacrifices established the [[Imperium]] as the dominant power-faction operating for long periods without sleep by switching off parts of the galaxytheir brains at a time.

However As they are both elite and constitute a full half of these legions turned against humanityvery small number, forsaking they fight as mobile strike forces; their oaths battles are decisive, where battles of loyalty towards the [[Emperor]]. Following their [[primarch]]s, these traitors pledged themselves to the [[Chaos Gods]] and nearly destroyed the Imperiumlesser Imperial forces are won through attrition.

To this day the loyal Space Marines continue to protect Humanity from aggressive alien species, like the barbaric They wear [[Orkpower armour]]; which, due to the mysterious [[Eldar]] and their renegade kin numerous implants the piratical [[Dark Eldar]], the technological and idealistic [[Tau]]Space Marines possess, the ever-hungry [[Tyranids]] and the ancient [[Necrons]], besides many other [[Xeno]] races. But they most fervently oppose the traitors within, and most especially their former brothers, the [[Chaos Space Marines]]are able to fully interact with.

There are presently said During the [[Great Crusade]], twenty [[Space Marine Legion]]s under the Emperor of Mankind, unified the fragmented Humanity into a single Imperium. Half of these legions turned against humanity in a rebellion known the Horus Heresy. Under the Emperor's greatest general, the Primarch Horus, these Traitor Legions fought the loyal Legions in a galactic civil war, culminating in a siege of Terra. The Heresy ended only when Horus was slain by the Emperor. To this day the loyal Space Marines continue to be between 989 protect Humanity from aggressive alien species, like the barbaric [[Ork]], the mysterious [[Eldar]], their renegade kin the piratical [[Dark Eldar]], the technological and 1idealistic [[Tau]],021 the voracious [[Tyranids]] and the ancient [[Necrons]], besides many other alien races. Alongside these threats to mankind's continued dominance are their former brothers, the [[Chaos Space Marines]], who survive and remain a threat to this day. There are at any one time roughly a thousand Space Marine Chapters. As of 765.[[M41]], 13 chapters have been lost to in the [[warp]], 21 destroyed through irrecoverable battle losses, nine destroyed by [[gene-seed]] failure, four by [[Inquisition|inquisitorial]] purges and 16 lost through other circumstances.¹

As the [[Emperor|Emperor of Mankind]] began to plan the ''[[Great Crusade]]'' he felt the need for faithful lieutenants who could lead his forces throughout the galaxy. Even the Emperor could not be everywhere at the same time, and accordingly he created twenty ''Primarchs'' using his own DNA. However while the foetal primarchs where still maturating inside of womb-vats, the [[Chaos Gods]] somehow managed to spirit them away. Unable to destroy them, they still were able to scatter the primarchs in the galaxy. However not everything was lost, and using samples collected previously from the primarchs the Emperor was able to create ''Space Marines''. In the creation of a particular legion he only used the material of a single primarch. This created twenty distinct ''Space Marines Legions'' which he lead into the Great Crusade.

During the Great Crusade, the Emperor, sensing that the primarchs were still alive, searched and eventually found his 'sons', one by one. Upon discovery the single primarch would be evaluated, and if found worthy - all of them were - recieved received the command of his respective legion. His homeworld would also become the new homebase of the Space Marine Legion in question. The first to be found was [[Horus]], who would become the most trusted 'son', second only to the Emperor.

Eventually, the Great Crusade reached a point where the Emperor felt that his Primarchs could continue without him. He returned to [[Terra]] to begin to re-organise reorganise his Empire empire into a unified whole. He left Horus in command of all forces, naming him [[Warmaster]]. Alas, under mysterious circumstances Horus fell to [[Chaos]] and betrayed the Emperor's trust, planning and waging a terrible civil-war later to be known as the ''Horus Heresy''.

During the [[M31|31st Millenium]], Horus was afflicted by a disease and took refuge on a [[Feral World]] named [[Davin]]. It was after his healing that Horus's attitudes began to change. During his illness he was inducted into a Warrior Lodge, becoming a Brother of the lodge rather than an outsider. This seemed to increase his rate of change, and further drew Horus to Chaos. Once Horus was well again, he brought his forces [[Isstvan III]] to put down a local revolt. After arranging for marines Marines whose loyalty was more to the Emperor than to himself to lead the assault, Horus ordered his fleet to [[virus bomb]] the entire planet, destroying the entire population and most of the Marines on the surface. This was Horus's first overt act of treachery. Only one ship, the Eisenstein, commanded by a captain of the Death Guard legion, managed to escape with word of what had happened.

The Battle of Terra involved many Space Marine Legions and culminated in a battle of wills between Horus and the Emperor. Horus had baited the Emperor into teleporting onto his [[Battle Barge]] by simply lowering his void shields. The Emperor, [[Sanguinius]], [[Rogal Dorn]] and several Space Marines teleported onto the ship but were somehow scattered throughout the ship. Sanguinius was the reached Horus first to reach Horus, where he and was offered a place by Horus' side, which he refusedslain. When the Emperor found Horus concluded by killing over Sanguinius. Just as Sanguinius died's body, the Emperor found and Horus' command centre and the two became locked in an epic battle, using waged in both the physical and psychic strengthuniverse. Horus would only be The battle ended defeated when the Emperor realised that he could no longer not save his "son " from Chaos, and that he ; the Emperor had to die. He unleashed a massive psychic barrage which killed Horus almost instantly, but in his last dying moments, the Emperor saw Chaos leave abandon all compassion to destroy Horus and felt him return to sanity, if only for a moment.

Horus had died. Howeverwas killed, during the great combat but the Emperor had taken several mortal wounds and ; Rogal Dorn found him on the deck of the ship; the Emperor, with his last words, where instructed that he received the designs for be placed within the life-supporting [[Golden Throne]] on , in which , ten thousand years later, the Emperor now still resides.

The principle of the Codex was to re-organise reorganise the huge Space Marine Legions into [[Chapters]], smaller units one tenth of the legions original size. The Chapters consisted of, at maximum, 1,000 standard Space Marines as well as their accompanying commanders and assistants. Each Chapter has its own unique heraldry and traditions, primarily drawn from the original Space Marine Legion. Most Chapters tend to follow the [[Codex Astartes]], notable exceptions being the [[Black Templars]], [[Blood Angels]], [[Space Wolves]], and [[Dark Angels]].

'''Phase 8 - Omophagea''' - This complicated implant allows a Space Marine to 'learn by eating'. Situated It is situated in the spinal cord, four but is actually part of the brain. Four nerve bundles are implanted connecting the spine and the stomach wall. Able to 'read' or absorb genetic material consumed by the marine, the omophagea transmits the gained information to the Marine's brain as a set of memories or experiences. It is the presence of this organ, possibly mutated, which is responsible for the various flesh-eating and blood-drinking rituals for which certain Marine Chaptersare famous, as well as giving names to chapters such as the [[Blood Drinkers]] and [[Flesh Tearers]]. Over time, are famousmutations in this implant have given some chapters unnatural craving for blood or flesh.²

'''Phase 12 - Sus-an Membrane''' - Initially implanted above the brain, this membrane eventually merges with the recipient's entire brain. Ineffective without follow-up chemical therapy and training, but with sufficient training a Space Marine can use this implant to enter a state of suspended animation, consciously or as an automatic reaction to extreme trauma, keeping the Marine alive for years, even if he has suffered otherwise mortal wounds. Only the appropriate chemical therapy or auto-suggestion can revive a Marine from this state. The longest known recorded period spent in suspended animation was undertaken by Brother Silas Err of the Dark Angels, who was revived after 567 years. It should also be noted that Talonmaster Zso Sahaal of the Night Lord's legion spent nearly ten thousand years in suspended animation when his ship was entombed in the warp by the Eldar, however time in his ship may not have passed at the same rate as in normal space.²

'''Phase 13 - Melanochrome''' - This implant allows a Space Marine to control controls the amount of melanin in his a Marine's skin. Exposure to high levels of sunlight will result in the Marine's skin darkening to the appropriate level, changing the Marine's skin colourcompensate. It also protects the marine Marine from other forms of radiation.²

Space Marines have very organised daily routines including combat duty, prayer and indoctrination sessions with very little free time. This lends itself well to the organised mind disciplined and monastic nature of a the Space MarineMarines. They also spend very little time resting, made possible by the training and implants and many . Many Chapter-Masters prefer to randomise schedules to keep the brethren constantly alert.