Warhammer 40,000

In the grim darkness of the far future, there is only war!

Warhammer 40,000, also referred to as Warhammer 40k, or sometimes just 40k is a continuum based on the popular tabletop game released by Games Workshop.

The game was originally a rather blatant futuristic expy of the Warhammer series by the same company (as evidenced by most of its races being describable as "X in Space"), but has since grown into its own canon with a dark and gritty feel.

Setting
The game is based on the premise that in the 41st/42nd millennium (hence the 40,000), humanity has spread out across the stars- and promptly come under attack on all sides (including from itself).

Humanity is technically ruled by the God-Emperor of Mankind; however, he is almost dead and only sustained by the great Golden Throne in which he is interred, unable to move or speak. Only his sheer force of will has kept him "alive" for so long. In practice the Imperium is ruled by the Senatorum Imperialis, the twelve High Lords of Terra, and functions as a religious state. To make matters worse, there have been hints that the Emperor's life-support has begun to falter, and when he finally dies, humanity will be doomed, since the Emperor's power is the only thing that makes faster-than-light travel possible.

Most of the Imperium is dystopian- hence the "grim darkness of the far future". The Empire is so massive and sprawling that it includes countless different worlds of all types, ranging from Neolithic jungle death worlds, like Catachaen, to polluted hive worlds, like Armageddon.

The Adeptus Mechanicus, the Tech-Priests of Mars, are the engineers and technicians of the Imperium, and create most of the Imperium's more advanced machinery and weaponry, among other things, despite the fact that their understanding of the technology they use is limited at best, with much of their procedure based on ritual and religious dogma rather than genuine engineering or mechanical skill. The Imperium was originally formed by the re-uniting of the Tech-Adepts of Mars and the Emperor, before his ascension to Godhood. The alliance was dictated by their own religious doctrines in which the Emperor occupies a messianic position of authority.

The Adeptus Mechanicus believe that all knowledge already exists and that humanity only found it. They also see technology as a sort of life form, preaching that the Imperium's machines possess a sort of spirit known as "machine spirit" which only serves humanity. Most ordinary humans don't understand technology at all and assume it is some type of magic.

The Imperium is surrounded by alien species, and is also under continual attack from the forces of Chaos.

The Imperium of Man
The Imperium's defence forces consist of:


 * the Imperial Guard, hundreds of billions of conscripts who hold the line against the Imperium's enemies largely with their bodies alone
 * the Imperial Navy, which navigates the Warp and keeps the connections between the countless worlds relatively safe
 * the Adeptus Astartes, a.k.a. the Space Marines, who are the power-armored special troops of the Imperium who are effectively poison-spitting, metal-eating, barely human weapons platforms after a complex system of hypnotherapy and cybernetic enhancement. There were originally 20 chapters of Space Marines, but ten of them betrayed the Imperium and became Chaos Space Marines during the Horus Heresy.
 * the Adeptus Custodes, the Emperor's bodyguard
 * the Adeptus Arbites, the police force of the Imperium
 * the Adepta Sororitas a.k.a. the Sisters of Battle, female warrior-nuns of the Imperial Cult
 * the Inquisition, a large internal force that consists of three branches, and is devoted to keeping the Imperium "clean". These are:
 * the Ordo Xenos, which "handles" alien entities like the Tau
 * the Ordo Hereticus, which deals with heresy against the Emperor and the Imperium in general (a surprisingly broad field)
 * the Ordo Malleus, which handles demonic forces like the Warp and the Chaos which has spawned from it.

The Rest
The enemies of the Imperium include:


 * The renegade forces of Chaos (Crazy mutants and traitors worshiping the Ruinous Powers. Chief among the Chaos gods are: Khorne, the Blood God who revels in death and destruction; Tzeentch, the Changer of Ways who is always plotting something unpleasant; Nurgle, the Great Lord of Decay who could be compared to Santa Claus, but with horrifyingly nasty diseases instead of toys; and Slaanesh, the hedonistic and androgynous Prince/Princess of Excess who is pretty much the living embodiment of Squick. Whenever they are not fighting the Imperium or any of the other races, they fight among themselves in an endless battle for supremacy.)
 * Eldar (The remnants of an ancient elf-like race; directly created the Chaos God Slaanesh through several millenia of unspeakable acts of debauchery and are constantly trying to stay one step ahead of him/her/it; sometimes allies of the Imperium, but usually one is manipulating the other in this case, and the alliance is always a tenuous one. Most of the Eldar either live on planet-sized spaceships called Craftworlds or are slaves to Slaanesh's twisted desires.)
 * The Dark Eldar (A rogue group of Eldar who constantly commit acts of depravity in order to prevent the Chaos God Slaanesh from eating their souls, namely by taking the souls of those they kill.)
 * The Tyranid Hive Fleets (Giant, heavily armoured insect monsters. Devour entire planets, including the atmosphere and the crust. And it's implied that they're fleeing from something even worse.)
 * Orks (Big, green, and nasty. The most numerous species in the galaxy by far; the only reason they haven't banded together and easily crushed all opposition is the fact that they tend to spend more time fighting each other. Literally an entire species of biological weapons, as they were created specifically by an ancient race called the Old Ones to fight against the Necrons. They possess a gestalt psychic field called the WAAAGH! that allows most of their technology to work in spite of common sense, like how if a "trukk" goes faster if it's painted red. The WAAAGH! is also a time when Orks actually band together to fight other races in a mass migration/holy war/looting party/bar fight that only ends when the WAAAGH! leader is killed or when there's no one else left to kill. )
 * The Tau Empire ("Space commies"; blue skinned aliens with very powerful technology, probably the closest thing to "good guys" in the entire setting, and even then that's if you ignore the allegations of forced sterilization and brainwashing; like the Eldar, they are sometimes allies of the Imperium, and aside from the Damocles and Nimbosa crusades there is usually a truce of sorts between the two empires.)
 * The Necrons (creepy robots which can't be killed, and want to kill everything, down to the last bacteria; used to be an incredibly short-lived race called the Necrontyr, but gave their souls and bodies to the C'tan star gods in exchange for immortality, they are now no more than mindless slaves to said star gods.)

To be a man in this continuum is to be one of countless trillions, and probably very dead. Or worse.

Agents from the Warhammer 40k continuum

 * Agent Rose Marcone (unknown)
 * Agent Mkellin (Imperial Guard; Tanith First-and-Only)
 * Agent Zodfang Gobrunt (Ork)
 * Agent Uriel Thane (Imperial Guard; Praetorian Guard)
 * Agent Chliever (Greater Daemon of Nurgle- Great Unclean One)
 * Agent Alaric Kovalenko (Imperial Guard; Praetorian Guard)
 * Possibly Agent Richi, judging by her use of the Tanith obscenity/blaspheme "Feth", but this isn't known for sure.