Cthulhu Mythos

"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have hitherto harmed us little; but someday the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new dark age."

- 'Writer' creator- Howard Phillips Lovecraft

The 'Cthulhu Mythos' is an Outerverse created by a 'Writer' named Howard Phillips Lovecraft, existing within the Omniverse. This Outerverse is ruled like many others by an Avatar of God but focuses on the many Elder Gods and beings that inhabit its Outerverse, describing them the aspect of the madness existing within the human mind.

History
The history of this Outerverse begins like many others, an Avatar of God wandered the Omniverse and soon created a new Outerverse, however, this one was different. This Avatar of God had a name, a true name- it went by 'Azathoth', and unlike others, it had the power of omnipotence only when it dreamed. So, one day deep inside the Omniverse 'Azathoth' slept, and with that, an entire Outerverse was created around him which placed him at the center of it, to forever slumber for if he ever woke up, the Outerverse would vanish from existence. From him, many other great beings of power, elder and outer beings slowly began to emerge and populate this new Outerverse, but always keeping their creator in eternal sleep.

(To learn more, simply look into the Cthulhu Mythos).