But basically in the nasuverse they have an infinite number of universes and these universes have a Finite size (although not specified)
There are also totally different / non-parallel universes such as the Servant Universe where Sapphire Galaxy is located
In each universe there are like small timelines which are parallel worlds in a universe (as in Grand Order the Lostbelt which are worlds where the history of mindkind fails but instead of being erased by the WORLD, these timelines continue to exist and are supplied with energy of fantasy trees). These small chronologies are finite in each universe
On a planet Earth in Nasu, there are Textures, layers of realities with laws that differ depending on the texture and time. There is the reverse side of the world which is a place preserving the laws of the age of the Gods (the divine spirit, certain "heroic" spirit and other supernatural creatures exist there. Avalon exists in the reverse side of the world, Avalon is a "paradise" containing a lot of energy, it is said that a normal human could not exist and would die in it, Emiya Shirou was able to reach him in one of the Stay night routes (or HF I don't remember)
There is also the world of the Outer Gods, Evil Gods of the Abyss, their world is beyond parallel universes and incompatible with logic, laws, reality as humans know it, all being (including Servants, spririt etc) who enter this world will go mad and distortions in their body and mind are created.
There are the digital spaces, cyber worlds spriritron as MoonCell or the SE RA PH of Fate Grand Order, basically they are digital spaces simulating the Milky Way (at least for CCC in the Far Side) and the Earth more precisely. Humans can convert their soul into a vitrual spiritron to exist in the cyber world.
There is the human orders which are the area in every universe, world etc that humans or related things have discovered. The laws of physics and certain concetpe like death exist only in the human orders and not in all the universe (it is the case for each universe including non parallel). Generally in the different universes where the Nasu works take place, the human order is established in the solar system or the galaxy for cetrains (which does not mean that there are no other beings, creatures living elsewhere in these universes (as with Sefar for example who is an extraterrestrial entity coming from elsewhere and created by a civilization who existed long before the creation of Earth). In the Servant Universe the human order is established throughout an entire galaxy and humans / servant inhabit its various planets; which means that the laws of physics that we know, death and other concepts are only present in this galaxy.
There are imaginary numbers spaces which are places outside of space, time, worlds/universes, and reality. Laws don't exist in it unless an imaginary element user creates a dimension in an imaginary nombers spaces. The Outer Gods send avatars of them into the imaginary number world sea as seen in the Imaginary scramble event. Nyarlathotep in the world of FGO gives powers to BB in FGO and allowed her to use her powers in the material world and convert the reality around her into Imganinary numbers. Solomon created his reality marble in the world of imaginary numbers.
And the place above all, the throne of God, akasha, the Root (which is a place). It is the metaphisical place of the void, outside of everything, all the events, possibilities, concepts, universe, beings / souls come from this place and everything returns there at the end.
I probably forgot some stuff, and maybe made some mistake because I don't know everything.
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