Multiverse

The multiverse is a collection of infinite realities created based on infinite possibilities. Its structure is seemingly infinite layers of dimensional space on top of each other. Each one containing infinite universes

"Imagine a cookie. The chocolate chips can only move forwards and backwards. It’s what’s known as a one-dimensional cookie. And on top of it is another cookie. The chocolate chips on this one can also move left to right. It’s two-dimensional. Then on top of that one is a three-dimensional cookie whose chips can move up and down. Each of these chips are universes and each of the cookies, dimensions. The third dimension, the one we live one, is infinite chocolate chips on an infinite cookie. Then, above the three-dimensional cookie is a four-dimensional cookie. The chocolate chips on it can also move back and forth through time. And each of the chips on each of the cookies are connected to each other. The universe we live in is connected to the two-dimensional, three-dimensional and one-dimensional versions of this universe. But it’s also connected to the four-dimensional version of itself. Now if we could transport ourselves through the fourth dimension we could end up in the past or future of our own three-dimensional “chocolate chip” universe."

The First Dimension
The foundation for all of reality. It is made up of infinite one-dimensional entities called "Strings". They vibrate at different frequencies allowing for the diversity of life. It's unknown if this dimension is separated into universes like the rest.

The Second Dimension
This is the lowest dimension capable of sustaining sentient life forms. It's residents are able to move in left/right and forward/backward motions.

The Third Dimension
The dimension in which we are most familiar. The residents are capable of moving in left/right, forward/backward and up/down motions. It's separated into infinite universes. The life forms within perceive time but cannot move through it at will, with exception. Such as: The Traveler, who has access to to a three dimensional pocket within the fourth dimension, Kris Kringle, who can travel using an advanced sleigh, and William Beckett, who accidentally gained the ability to move through the fourth dimension.

The Fourth Dimension
A place where life forms can time travel as easily as a three-dimensional being would jump up or down. It is not possible to manually create new timelines here as time is so malleable.

The Fifth Dimension
The mindscape, where reality and fantasy are one in the same.

The Sixth Dimension and above
Not much is known about the many, many dimensions higher than the fifth. What is known is that the highest dimension is inhabited by only one being, the one who created all of reality, God.