/tg/ here: I'd like to write a roleplaying setting that combines everything from all the different genres and subgenres of speculative fiction together.
The story I got so far is this:
In the beginning, one universe in a multiverse expanded from a singularity and eventually gave rise to the first mind.
Because this universe had magic as a natural phenomenon, the mental activities of the minds within any universe could contribute to the warping of reality itself with the sum of their psychic influence, with only the opposition of the activity of other minds to limit them.
Since the first mind was alone, it had absolute omnipotence at it's disposal, and soon after, omniscience and omnipresence, this was the birth of the one oldest God, truly almighty, and of a nature beyond all comprehension, neither male nor female, one in which all things, possible and impossible, resided.
Omnipotence is a dangerous thing, and soon, for unknown reasons, this led to the first God tearing itself into two halves, each representing polar opposites of reality, one created within the other.
This was the asexual creation of two other Gods, A Female God born pregnant with a Male God inside her, these were the Twin Gods of Yin and Yang.
The Female God was Yin, she represented that which was negative (zero as a maximum, cold, quiet, still, etc.), static/orderly, and the immaterial/mental/supernatural, her elements were those of the Inorganic (Metal), Solid (Earth), Liquid (Water), and Darkness (Void).
The Male God she gave birth to was Yang, and represented all her opposites, the positive (zero as a minimum, hot, loud, fast, etc.), dynamic/chaotic, and the substantial/physical/mundane, his elements were those of the Biological (Wood), Plasmic (Fire), Gaseous (Air), and Light (Aether).
These two Gods, each representing all the opposite extremes of nature, longed for each other, seeing balance, they attempted to reunite, with the God of Yang trying to return to the womb of The Goddess of Yin, but as they were so strongly opposed, their very nature had prevented complete reunification, it was their opposing natures that caused the Yang God to be expelled
from the Yin goddess in the first place.
However, due to sharing one point of commonality, the God of Yang was able to partially enter The Goddess of Yin, and discharge a part of himself into her, she eagerly accepted that part of him into herself, and tried to hold it within her, this process was very pleasurable for the both of them.
However, the Yin Goddess could not keep that part of the Yang God within her, and soon after it was violently expelled from her the same way it had come in.
The discharge was a mixture of Yang and Yin, given the form of a new God.
Yang and Yin repeated this process many times, giving birth to a great many Gods, who made up the first pantheon of the old Gods.
As you may have figured, this was the advent of sexual reproduction.
Next part will focus on the birth of the second pantheon from the first pantheon's gods and godessess turning to each other after being refused by their opposite sexed parent, the first rebellion where the second pantheon forms three factions, one of which kills and devours their opposite sexed grandparents after killing and devouring the faction of their siblings that tried to stop them, the faction that tried to stop them and got killed and devoured for doing so, and the third faction who remained neutral, the creation of the Heavens, where the rebels became the True Gods of the high heavens, and the neutral gods became the Angels of the low heavens.
Then the Second rebellion where the first pantheon had also split into three factions upon seeing what had been done to their parents, one turning against their siblings to protect their children, and being killed and devoured for doing so, one faction turning on their children and killing and devouring their siblings for trying to stop them, and one faction which remained neutral, the defeat of the first pantheon by their children, and the creation of the Hells to imprison the parents their children could not bring themselves to kill, the rebellious ones becoming the Devils of the deep hells, and the neutral ones becoming the Demons of the shallow hells.
Last will be the third rebellion, the betrayal of Gods and Angels who opened up the prison of Hell and becoming the Gods of death known as psychopomps/shinegami, The redemption of Devils and Demons who unexpectedly fought in the name of the kingdom of Heaven and became the Gods of animism known as the totems/kami, The stalemate and truce between heaven and hell, and the creation of the middle world, the world of spirits with the reborn Yang as the Lord of Spirits (aka "great spirit"), and the world of souls with the reborn Yin as the Lady of Souls (aka "death herself"), and then the rebirth of the multiverse, where the Gods and Devils play games with mortals and monsters, as the spirit world fills with spirits and the soul world fills with souls.
The last part are notes on the afterlife, where after dying, a soul spends time in the world of souls (limbo/purgatory) before being claimed by a psychopomp, brought to be judged and divided, with the high soul heading to a place just outside heaven, and the low soul heading to a place just outside hell, in heaven and hell, the soul remains for a while, until it dies a second death, as the souls are dissolved back into their soulstuff which is then used to create a new soul reincarnated into a new body, the escape being karmic harmony and spiritual enlightenment, where the soul instead remains intact and ascends to the spirit world as an ancestral spirit, until dying the third death, and ceasing to be or becoming one with everything depending upon how one sees it, which is the ultimate goal, returning to the one for the great reunification of everything back into the one, but this time with the wisdom to hold itself together, which the one had lacked from inexperience, and may have split in order to set in motion this process of self-advancement.