An endless blank canvas, no time, dimension, space, nothing, that is all there is. A sentient entity with divine essence woke up, with the awakening of this deity births an orb. An orb that, once entered, contains innumerable galaxies and multiple dimensions and pocket dimensions.
"Universe." The deity's voice echoes, and it was so, the first universe has been created. Though this wasn't enough to satisfy the deity. The universe was only a glowing ball in umbra. With the mere twitch of the deity's finger another universe materializes from nothing right next to the first one. "It is not enough." The deity mutters to itself almost seemingly frustrated. It twitches its fingers more and more, and more universes pop into existence. Twenty-six universes are created and they are arranged in a straight line of cosmic multi-dimensional seemingly spherical constructs.
The deity then decided to create the possibility of life, for it was quiet and still all throughout the multiverse besides the humming of constructs. After a moment of silence, the deity blinks and animals, humans, and other various lifeforms into being across all the multiverse. Due to the boredom of the deity, with every Planck time a new endless amount of worlds are created, resulting in an immense abundance of timelines. All possibilities are made into more worlds, because the deity was bored. The deity sought to add spice to all of creation, so it decided to allow powers and more into existence, this is where the fun truly began.
The deity had created infinite timelines and infinite universes, therefore were infinite multiverses within timelines which were called omniverses. The deity had also created infinite sets of realities, planes, and layers of existence, along with an endless amount of infinite dimensional hierarchies. These hierarchies would be called, "Ladders," and as already insinuated there are an infinite amount of Ladders. The deity needed transcendental realms for powerful beings such as itself, so it created realms beyond all concepts of time, space, and dimensionality as a whole. "Yes, it is almost perfect." The deity's voice echoed. There was still more the deity wanted to create before officially letting all of creation freely live on.
In the Ladders there are infinite omniverses and realms in each level. The lowest are "Base Realms," in the middle are "Alpha Realms," and the highest are "Outer Realms." There are infinite layers to each of these, in which each layer views the lower as fiction. By the Alpha Realms dimensionality and all concepts and more are irrelevant, the Outer Realms and its infinite layers have absolute transcendence over Alpha Realms and all things below it. The deity didn't stop there though, all things mentioned are merely part of a lower field of existence, the deity created a higher field called "Ascension," there are innumerable Ascensions, which is the same thing except exists totally conceptually in every way transcendent and views the lower field as fiction. Within the two fields of existence there are infinite cosmologies, meaning any construct and/or concept that someone can come up with already exists and there's likely an infinite amount of it.
The deity decided it was finally done and left, to where, nobody knows, but one thing's for sure.
The deity sure made a mess.