Warning: This chapter may conflict with canon. Depending on your POV.
Also, this may confuse you if you don't know anything about Warhammer 40k. And thank you for 500 views!
As the obelisk fell, as the first universe formed, the shards fell.
Some fell and formed harmoniously, asleep and at peace, flowing seamlessly through darkness like a ocean of light. The essence of the Daughter fell in this ocean, enlightening and unshaping as it swims free in glistening ether. It was the sea of souls, a turbulent immaterial above, below, beside, and enveloping the material world. The ether was the Realm of Souls.
Others fell and formed disharmoniously, awake and enraged, grinding against each other while eating the endless dark. The essence of the Son looked curiously, only for the shards to lash and bite. The essence screeched and squealed against the uncountable fang-like shards, ripping and piercing as whatever left of the Son faded into the discord. As the discord was GOLB.
Longer than what was possible the Crimson God sat over the Realm of Souls as his breath formed the first universe. At times, GOLB would sway a thousand formed hand through the ethereal ocean, curiously and almost jealously. His uncountable eyes burned as he spat the plant of unlight for it was the last of the Son's essence, he saw it fester, he saw it grow and wrench the light away. It destroyed the universe so spectacularly, and it did it again, and again, and again for countless times.
Then he saw the Realm of Souls churn in discord, unorder, and chaos. The raw emotion of trillions of dark emotions, anger, fear, despair, pride, and hate disbalanced and churned the ether, for it births nightmarish creatures from it's darkest parts, areas of abstract, and entities of blue, red, green, and pink.
The blue was ambition, intrigue, pursuit of knowledge, evolution, and change.
The red was anger, rage, hatred, violence and blood shed.
The green was physical corruption, fear of mortality, self-delusion, and despair.
The pink was lust, greed, excess, depravity, and pleasure.
As each universe fell, the colors would grow as they feed on the raw emotions of those of the material realm. The red burned, the green writhed, the blue slithered, and the pink shined.
Eventually, the colors blazed as GOLB watched becoming nothing short of Gods.
The blue became Tzeentch, Changer of Ways. Meditating and planning in his evershifting Crystal Labyrinth.
The red became Khorne, The Blood God. Gleefully watching bloodshed on his Throne of Skulls.
The green became Nurgle, Father of Plagues. Humming cheerfully as he tends his Garden of Pestilence.
The pink became Slaanesh, Prince of Pleasure. Singing and dancing in his Palace of Pleasure.
After their birth, the Realm of Souls was given a new name. The Warp.
Each god sought to enter the physical world and spread their chaos, but the Lords of Order along with the ancient users of Aura engraved the Seven Chakras in every soul to silence their voices. Now, they can only spread to the disillusioned, the unawakened, and the unfaithful.
They corrupt, they feed, and they leech off everyone and everything so they can have the universe for them to mold, them to control, and them to rule undefied and unrestrained.
They cannot be killed and they cannot be stopped, for they are the most fundamental aspect of human nature; Power.
Power to rule, power to control, power to protect, power to guide, or power to destroy. We want power.
And the Warp grants such power. For the Warp is the origin of all power behind the soul. As the soul records events, it gains power through the personality that it develops, then it awakens through the form of Aura, then as they grow, the Aura grows a semblance to the one it holds.
It was this way for uncounted years, but now, since the world ended, came a new breed. During the end, a rift from the Warp formed, that sulfated the world in it's light. From that light, came power that most thought impossible. They were called; Psykers.
Psykers are those who were exposed to Warp's light without unlocking Aura or have Auroriosis, and gain immense power. When one unlocks Aura, the Seven Chakras restrain the flow of energy from the Warp to control the amount of power given. As the Aura and by extension the Chakras have not been unlocked, it causes the amount of energy that the soul usually produces to skyrocket, leading to the recipient to gain power usually in the form of psychic abilities, hence the moniker; 'Psykers.' These abilities will vary from person to person as unique abilities will manifest in a way similar to semblances. Semblances for Psykers are much more potent and explosive in power than semblances for Aura users due to the aforementioned Chakras not being established.
This power comes at a terrible cost. If one is weak and is tempted by the Gods of Chaos, they will be enslave by their daemons and forced to live as messengers of the Gods. They will be mutated minorly by their god as sign of allegiance. Warped by Tzeentch, illed by Nurgle, maddened by Khorne, or ravaged by Slaanesh.
However, should they overcome the daemon and prove worth to their god, they may be granted favor, becoming Champions of Chaos. The champions of Chaos will be granted further mutations and control over hordes of Daemons.
Should they continue to prove worth, they maybe granted the honor of throwing away their humanity entirely, becoming a Daemon. These are Daemon Princes; there they shed human form and one provided by their gods, granted power beyond their dreams.
For the Grimm are not the only threat in this Tale of Nowhere.