Ladies and gentlemen, I present you, the cosmos.
Note that the layer explanation falls a bit short, as you hardly actually reach the above or below plane of existance simply by moving up - though in the olden days, when people tried to reach the lands of the dead by strapping themselves to a flying machine and going straight up, thats usualy where they ended up in
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Rather, consider each Sphere equal in size, overlapping eachother, with the exception of the core, which is said to too small to be described, and the number 15, which encompasses all native parallel universes.
now then, some explanations.
1.The core of the cosmos, Weltenherz, the foundation of creation. It alone holds all laws of nature, physics, the flow of time, the entire package that sets the rules of the universe. These laws were set by Shysm'Caes at the beginning of creation, and have not been tinkered with since. Legend sais, it no longer *can* be tinkered with, by no force within or outside of creation. This place is Order and Law, and radiates outwards into the outer layers of the cosmos - the further you are from the core, the less strict the laws of physics become, this is why magic is possible in higher spheres, until the laws of physics finaly land in hell where they hardly matter anymore.
This core, unless objected, is the origin of time and is only inhabited by two entities - the guardian over time, who prevents time being tinkered with in any way he can. And since he alone is not bound to the rules of time, he usualy prevents tinkering with time long before the tinkering even happens, which is why higher spheres do not even know he exists. The second entity is the smith of souls. The core is the origin of souls, and said smith forms the raw energy into small, human appropriate sizes. Gods usualy send their orders to this guy whenever they wish to grant anything a soul, and he has always delivered, each and every one unique and to specification of whatever it is meant for - it remains unknown if souls can ever run out.
2.The origin of the 6 elements. ((may be adjusted to however many elements this universe recognises as an element)). No magic is possible in this sphere, apart from manipulation of the respective element. This sphere houses elementals, and is popular for summonings. The *spikes* are their citadels, and it is said that their deepest dungeons reach all the way to the core, while their highest towers reach all the way into the mortal realm. This sphere is segmented into 6 (or however many) parts that are governed by the elemental lords, primordeal beings that are in charge of keeping the elements in balance. Many have sought to enter this place in hopes of gaining greater power over their favoured element. They may find that entering that contains nothing but fire, beings made of fire that eat and breath fire was not their brightest idea.
3.The citadel of water. Located in the mariana trench
4.The citadel of ice. Located somewhere in the ice of the northpole
5.The citadel of earth. Located under the Himalayan Mountains.
6. The citadel of fire. Location unknown, legends say that due to the nature of fire, no permanent citadel can be erected. Every, or most volcanic eruption is a sign of the citadel relocating. Note that earth does not include ground made of dead plant matter.
7. The citadel of wood, located in the amazonian rainforest. Note that wood is just a collective term for all organic matter.
8. The citadel of air, in constant movement around the atmosphere.
9. The mortal realm, contains the universe, planets and all the sorta stuff that one would expect from the mortal realm.
10. World Bubbles. This is usualy what happens whenever some great wizard tries to make his own pocket dimension, though the biggest are mostly natural occuring. Annabelles steampunk cube thing and Lunettes Arthurian world (probably?) fall into this category.
11. I forgot an 11. God damnit!
12. Purgatory, Limbo. A sphere very close to the mortal realm, and yet so far away. This place is literaly litered with scales, balances, courtrooms and dices, for various gods and saints and whatnot to decide wether you should go to heaven, hell, be reincarnated, and whatever other options there are. As long as a soul has not been judged yet it remains here and could probably be summoned with a seance and stuff like that, which becomes a whole lot more difficult once it has moved on. Some souls remain here, becoming ghosts. Because the wall between this sphere and the mortal realm is so thin, they can still somewhat interact with us. This realm also is host to a plethora of mystical beings. Magic is much easier to do here.
13. The realm of the gods and the paradises. This is where gods hang out when they are not meddling with mortals, and where they sent their favourite souls to get their eternal reward. As the description of "paradise" explains, here you can do everything you like - as rules of physics hardly apply anymore.
14. The hells, where all the souls go that are not going elsewhere, as per description of GWG.
15. The wall of stars. This is a wall out of sheer energy, needed to seperate the void from creation. Without it, the cosmos would simply dissolve into the eternal emptiness of the void. This raw energy is furthest removed from reality as it is possible within creation - in short, this is the sphere of Mana. Almost all magic that is not centered on the manipulation of an element is done by syphoning energy from this sphere and putting it to use. Few humans, or few entities in general have ever ventured into here, apart from gods, demons and perhaps the most powerful dragons. Magic in here comes as natural as breathing - will and imagination quickly becomes action.
Each of the *stars* one can observe in here is a parellel cosmos that follows (mostly) the same laws as ours, but a different line of events. Most likely, the Mirrorverse falls into this category, but that can not be said for certain.
It is a very philosophical question which is the main reality - if there even is one.
Note, if you are into astrology, it's *these* stars you have to look at to get an accurate view into future events.
16.The void, that extents eternaly into all directions. It is so empty that even it contains the entirety of creation, multiple other creations, and then even some more stuff that you could travel through it for eternity and not meet a single thing. Currently the only known way to get out of reality into the void or viceversa is through the void gate.
17. Other creations. So far away and so fundamentaly different from this creation that not even legends about them exist. They are not simply different in that hot snow falls upwards, they have an entirely different set pf physics - and possibly no concept of temperature or direction.
18. The tower of Belkelel, one of the 12 uncreated.
"Not a hint of life can be found in Dar'Klajids domain, yet in the towers that betray every law of nature and architecture, there is movement manifold. The damned toil in their clockwork bodies, working on constructs and tools that turn against viewer, visitor and user. And the will of the spoiler of the craft brings movement where there is no life, life where there is no warmth, breath where there is no breath, and the rocks rise and walk to earth. Connected to tubes and wires, cogs and levers is the unliving machinery that is called Belkelel, and it knows not sleep and it knows not rest." -Francis of Madrit, walker behind the stars.
19. The soulmill. A structure within the void that serves the purpose of destroying souls - an act so heavily against the rules of creation that there is no god who knows how to do that. They can maybe tinker with souls a bit, but destroying them is literaly ending the existance of a part of existance, making the soulmill perhaps the single most destructive force that has been observed. The sheer energy released in the process can be used as pure potential, usualy simply expanding the void, occasionaly to increase the power of one of it's denizens, very rarely to create a new entity. Much more rarely, so rarely that it is rumored a myth, the released potential is also gathered to create a new creation. Eventually, almost all souls that end up in the void for too long will end between it's grindstones. Most gods aren't exactly thrilled by it's existance, as it has been proven that even gods can and have been destroyed by this phenomenon