Debrief
It is the sixteenth Millennium. The Emperor of Mankind has sat motionless on the Golden Throne of Earth for almost a millenia. By the will of the gods, He is the lord of mankind, and by the power of His infinite army, He is the master of a million planets. He's a decaying cadaver from the Dark Age of Technology, writhing invisibly with power. He is the Carrion Lord of the huge Imperium of Man, for whom a thousand victims are sacrificed every day in order for Him to live forever.
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Races and Species
The Necrons are a mysterious xenos species of humanoid, robotic skeletal warriors that have lain dormant in their stasis-tombs for more than 60 million Terran years, though they have begun to awaken at last. They are the soulless creations and former servants of the ancient C'tan, the terrible Star Gods of Aeldari myth. The Necrons are ancient beyond reckoning, predating even the birth of the Aeldari. At long last, however, they are beginning to awaken from their Tomb Worlds, for the galaxy is ripe for conquest and the restoration of the Necron Empire since the disappearance of the Old Ones more than 60 million standard years ago.
The Greenskins, are a savage, warlike, green-skinned species of humanoids who possess physiological features of both animals and fungi who are spread all across the Milky Way Galaxy. They share many features with Fantasy Orcs (and were initially called "Space Orcs" to distinguish them). They are seen by their enemies (pretty much everyone else in the universe) as savage, violent, and crude, but they are the most successful species in the whole galaxy, outnumbering possibly every other intelligent starfaring species, even Humanity (with the very plausible exception of the Tyranids).
The Old Ones were an ancient and highly technologically and psychically advanced intelligent species of cold-blooded reptilian beings or an alliance of individual advanced species. They established an interstellar empire across the Milky Way Galaxy tens of millions of Terran years ago. The Old Ones ruled over the Milky Way before the development of most of the other sentient species of the galaxy. The Old Ones may have been the first species to attain sentience in the galaxy, and the first species to cross the "sea of stars," making them the first star-faring species in galactic history.
The T'au (Imperial binomial classification: Tau tau), also spelled Tau in older records and pronounced "TOW," are a young, humanoid and technologically-advanced intelligent species native to the Eastern Fringes of the Milky Way Galaxy. They are fighting to expand their interstellar empire and extend a philosophical concept they call the "Greater Good" (Tau'va in the T'au Lexicon) to all the intelligent species of the galaxy. The T'au claim to be a peaceful species when possible, asking if others will join their cause voluntarily instead of fighting against them. However, if their peaceful overtures are refused, the T'au may well decide to conquer a planet and add it to their growing interstellar empire for the Greater Good, searing the flesh from the bones of anyone who stands against their benign intentions.
A Perpetual was an individual who was a member of a mutant branch of the Human species who possessed seemingly superhuman abilities, the most important of which was immortality, for which they were named. Some were born with their abilities naturally as a genetic mutation, while others received them through artificial genetic intervention using advanced technology. However, every Perpetual was known to be effectively immortal, never aging and capable of ultimately healing almost any injury as a result of their extraordinarily rapid and efficient cellular regeneration.
The C'tan (pronounced ker-TAN) or Star Gods, called Yngir in the Aeldari Lexicon, are said to be the oldest intelligent beings in existence in the Milky Way Galaxy. It is said that they were created at the very beginning of the universe, spawned from swirling gases and enormous amounts of energy, and as such are etheric creatures by nature. In their natural form they are vast beings and spread themselves over the surface of a star, absorbing its solar energy to feed themselves. After a time, they learned to use diaphanous wings to travel to other stars to continue their consumption when their host star died. The matter around them was so insignificant that it did not register on their voracious appetite.