EDIT: I decided to remove the W.O.T Enjoy the Story now

In the Grim Darkness of the 41st Millennium Humanity is being attacked by all sides from without and within. The vast Imperium that continues to protect Humanity through arms since it's founding. The brave men and women of the Imperium of Man must deal with threats from without as well as within. As the forces of Chaos, entities of unholy power who reside in the Warp, a dimension that is along side our dimension and is fueled by the emotions of the Materium, the four deities that reside in the Warp wage an unholy campaign against the living beings of the Materium.

They march from their realms of utter insanity with beings that can only be considered 'Daemons', they are entities born off of the power of the 'god' they are born from, they take beliefs strategies and forms that resemble what they are. a Khornate daemon as an example would believe in blood and destruction and resemble the stereotypical Demon in their Materium form, they only live to cause death and give skulls to their 'Patron' Khorne who is known as the 'Blood God' and is born from the emotions created from the battlefield.He sits upon his 'Skull Throne' ever growing larger with every being killed in his name.

While Nurgle the 'God' of plagues and sickness, he is called 'Grandfather Nurgle' by his followers, his plagues are considered blessing by his followers and they believe that when they are spreading the plagues inflicted upon them to others is like a birthday gift, you deserve to be 'loved' by their god and his blessing so they think that you would want it and give it to you (This is just one case many others happen but this is the stereotypical depiction of his followers).

They are greatly different from each other and are constantly at each others throats at times while in others they work together to bring ruin. Their only 'True' foe is Humanity because of their Leader of as he is known to them as the 'Corpse Emperor' but in all seriousness he if he was not in what can be considered a coma by some standards he could possibly hold back the forces of Chaos single-handed, as he is known by his followers as the 'God-Emperor of Mankind' he is the Oldest Human in existence, Born before Humanity was just THINKING of civilization and then some. He is considered the savior of Humanity by all of the Imperium (That have not Fallen to Chaos) and as such treated as a god for what he has done time and time again, when he was 'Awake' the Imperium was not even near as zealous as it is now, in the 30th millennium Humanity time and time again he was called a god but he claims each and every time he heard comments that he was no god and that the 'Gods' of chaos were just powerful entities that can be defeated.As well as being the most powerful Human Psyker alive, Beings with the ability to defy physics and draw power from the Warp, They are Dangerous when provoked or 'Tainted' by Chaos, His mandate is to protect humanity and ensure it's survival.

There are many things wrong in this age, at least Morally, Humanity has become Feral and dangerous as such, it treats Psykers and Mutants with untold hate and 'Racism' while Xenos are Hated with an Untold Passion, and with good reason, in 'Happier' times Humanity had Alien allies and mingled with them on a daily basis but it ended badly as they claimed to have been betrayed by their 'Allies' when they needed it most and abandoned as their very species was being destroyed all-the-while by other aliens and the 'Men of Iron' or also known as 'Abominable Intelligence' As you can guess A.I were Humanities Protectors and Humanity forgot how to fight with them around.

But once the event I call the 'Betrayal' Humanity was slowly being wiped out planet by planet Sector by Sector by the very Machines that Protected them, Humanity had to learn how to fight once more and they were given no quarter and lost countless battles but in the end, Humanity won but at a cost. during this time Humanity once again was screwed over. Chaos erupted across the Galaxy trapping Humanity like a cancer it separated Humanity from everything else. Terra, the Human's homeworld was separated from it's empire and everything went wrong. Terra now an Apocalyptic wasteland as Humanity devolved into primitives once more but Humanity had some good fortune as the Emperor rose up and slowly united Humanity with his armies or 'Legions' of Super-Soldiers known as 'Adeptus Astartes' or also known as the Space Marines. This is what can be considered from the Space Marines as stated from their Creator, The Emperor,

"They shall be my finest warriors, these men who give of themselves to me. Like clay I shall mould them and in the furnace of war forge them. They shall be of iron will and steel sinew. In great armour I shall clad them and with the mightiest weapons they will be armed. They will be untouched by plague or disease; no sickness shall blight them. They shall have such tactics, strategies and machines that no foe can best them in battle. They are my bulwark against the Terror. They are the Defenders of Humanity. They are my Space Marines and they shall know no fear."

If you see a Space Marine approaching your direction and you are against them, The only way you have a chance of living is A) You have a lot of Heavy Weapons or B) Pray to your respective God that he doesn't notice you. There are Several 'Chapters' of Space Marines, the most 'well known' being the Black Templars who deal with 'Heretic Campaigns' with a great zeal, the other is known as Deathwatch, they deal with alien threats with great hatred.

Their primary fighting force is known as the Imperial Guard, They are either 'Drafted' or join willingly, Three Most well known Planets include Cadia, Krieg, and Catachan. There are Many more but these Three are where some of the Deadliest 'Guardsmen' come from, Cadians are located directly 'In front of' the Eye of Terror, a Warpstorm that hold the last of the 'Traitor Legions' as the 'last' bastion of Chaos' forces, and are Assaulted Daily by the enemy forces and is the worst planet to attack if it remained where it was due to the Massive amounts of Soldiers and Ships present to defend the rest of the Imperium from the beings inside of the Warpstorm.

Krieg is a Nuclear wasteland where they have a Brutal Training regime to the point they kill off any 'undesirables' and with that they have a Fanatical mindset that Commissars, Soldiers that have full authority to Execute others from Soldiers to Generals if needed, obsolete and the only reason they have any is to KEEP them from fighting instead of keeping them from running or retreating, and to keep things seemingly fair to the other Regiments outside the 'Death Korps' but mostly act as Advisors, they can be spotted from the 'Skull' gas masks they wear.

Catachans however are a different story all together the very planet itself tries to kill them, there is no exaggeration when I say the very plants on the planet are trying to kill them. Many Catachans are taught from the moment they can walk on how to stay alive and kill, and any who don't learn fast are killed off by the planet, many die but they hold out and provide possibly the most dangerous 'Guardsmen' in the Imperium, throughout the Imperium they were known as the 'Catachan Devils' and can adapt to pretty much ANY situation.

These three planets alone could prove to be the Deadliest forces you can fight that are still 'Human' while the Techpriests of Mars are the engineers of the Imperium they do not believe the God-Emperor of Mankind as everyone else does but in the sense that he is their 'Machine God' manifested and as such call him the Omnissiah, They are just as Religious as the others of Humanity but worst in some cases due to their zeal towards machines. Humanity overall is Dangerous but Understandably so due to their History as a species. They mostly Ignore everything and remain Isolated though the certain Humans from time to time come through are either called 'Rogue Traders' or are 'Inquisitors' not much is known about the Inquisitors but the Rogue Traders are Traders as the name implies but they have documents and such that allow them to recruit aliens into their crew and somehow still get jobs, they only value profits but surprisingly most of the Imperium for lack of a better word 'ignores' their involvement with Xenos to the point that they barely treat them with contempt, and from what I gathered it is a great feat, Though they are rare to the point of possibly only three 'well-known' traders exist and Inquisitors are fairly known and feared to the point that even in an intoxicated state they will not indulge on giving you anything that has to do with them.

She sighed as she looked on the notes she had gathered on Humanity which she would admit was more than she had thought she would get. Not much is known about Mankind but most of this was due to their Isolationist mindset and most of it was only through Interrogations of Imperial Prisoners during the '314 Incident' but hey it was better than nothing. She turned away from her terminal and looked outside her apartment. she silently thought to herself what happened to her actually wanting to know about Humanity at all. Since being 'Rescued' by an Imperial Regiment sent to 'Liberate' a Planet from the Batarians who had a large amount of Human Slaves on the planet. She was rescued and taken to the Citadel due to her 'Helpfulness' in dealing with the slavers who inhabited the planet. She sighed once again as she realized that it was getting late and went to her bed and thought once more of what Humanity has done and if it was actually true, most of it was thought off as just 'Intimidation attempts' but she found herself disagreeing with that, why try and intimidate them when they could just point to one of their ships or a tank instead. she sighed again as she attempted to fall asleep wondering what she would do to know more about them, they were an interesting race for sure, everyone can just refer to them as upstarts but their technological gap with our technology outclasses ours on the fact of pure brutality and what needed to be done according to what was gained from their P. .

AN: Well thats that to clarify, Humanity does NOT exist outside the Imperium, Only a few Planets from the 'True' Imperium Exist here of course Cadians, Catachan Devils and Korpsmen regiments are here but a few other Regiments exist here but not sure who to use, Another thing, There are only three 'Chapters' i'm using besides BT and DW, For example Grey knights (Useless in a technical sense ATM) and Bloodravens are all i'm revealing ATM, also this is a 'Lower cast' Humanity who will remain badass but not Super Zealous like the actual Imperium so I can have somewhat of a story, Finally the possibility of a certain question being asked here is it's answer (well three questions technically) 'Yes they exist as well their WH40k counterparts' and 'This Humanity is BARELY holding back contempt due to the fact their Military might and resources GREATLY reduced from what happened to them.' and finally 'They do have a 'Copy' of Terra and the Emperor (unsure if I should go "Fuck you Cannon" and have the Emperor Alive and well but hidden from the Xenos or have him at all [Might poll that])' but besides that fact I'm not sure on a few things but this is just a prelude for when I do the First Contact Scenario and I should have those things covered by the time Chapter two comes out also Not sure if this story will REPLACE 'A Union of time' as I may put that up for Adoption or just Abandon it or just keep it 'frozen' for a time until I decide on how to do the next chapter, Also a side note for those who are here from my OTHER story, This is just an update, I will not be Cancelling it for the foreseeable future but i'm also planning on making chapters longer than my usual 'One thousand words than done' routine. so that is all so Report a Mistake or ask questions if needed, May want someone to beta the next Chapter when done with it, Review and Enjoy the Prelude peeplz :D