Abyss

The Abyss refers to the space between worlds. As it is a place between parallel words, incomplete realities are all mashed together and made indistinguishable.

Let's put it this way:

In theory, there are an infinite sets of numbers. Also in theory, between each whole number, there is an infinite amount of irrational numbers. If each whole number represents a parallel world, Atal is made up of a bunch of irrational numbers somewhere between. A lot of the properties within these incomplete worlds are irrational as well. And by that irrationality I mean magic.

"Irrationality" vs. "Rationality"
I suppose it makes more sense to say "fantasy" vs. "reality" or "insanity" vs "sanity" or etc, etc. However, referring it to like this helps keep the whole number theory analogy consistent.

So...let's continue.

What makes the Abyss "irrational"?
A lot happens in certain parts of the Abyss. For one thing, it is within this space that dreams occur. Souls can travel through certain parts to other timelines and worlds. Magic exists within these parts. As this is a place between timelines, other worlds, this collective reality is much more chaotic.

In other words, humankind is known to try to make sense of the world around them. This "sense" and "logic" originates from the soul. And with rationality, they help form the worlds around them. On a side note, humans are not the only beings to possess such souls. Ideas and concepts are bounce off of each other. Bits of those, fall into the Abyss, falling further away from it's origin and mixes with other ideas and concepts from other worlds. This Abyss's insanity will eventually dissolve a soul and have its essence gets mixed in the batch.

Eventually, with enough souls in the batch, it may become a foundation in which it will draw more souls in order to stabilize itself. It becomes a Core. And then, that incomplete reality becomes a bit more complete. But what do the souls have to gain? Do they even maintain some sort consciousness?

Next: Cores and Domains