Reality coordinate system

The reality coordinate system is one of the core principles of the Weirdoverse. This elaborate structure defines the behavior of all realities within a dimension and is represented by a two- or three-dimensional Cartesian coordinate system.

Notation
The full notation of a given reality is "Dimension [Letter] ([x], [y])", i.e. "Dimension Alpha (1.2, 0)". This may be shortened to something like "Dim-A(1.2, 0)", or "A(1.2, 0)".

Axes of Reality
There are two confirmed and one unconfirmed spectra of realities, and each combination of coordinates produces a significantly (if not entirely) different universe.

Timelines (x-axis)
Realities with the same y-coordinate but a different x-coordinate will usually be similar. Generally, basic people and events are the same in neighboring realities. However, there are exceptions—A(1.1, 0) is vastly different from adjacent realities, for example.

The closer a reality's absolute value of x is to 0, the lesser the total essence. Note that some realities with low absolute values may seem powerful due to certain inhabitants or events, but that is only indicative of a significant imbalance of essence distribution. There is approximately one-tenth of a unit between each timeline.

Realms (y-axis)
While neighbors on the x-axis share histories, neighbors on the y-axis share little more than geological structure. Anthropological and geopolitical development is vastly different. For example, the realities with a y-value of -2 are still in an equivalent of the Dark Ages.

The closer a reality's absolute value of y is to 0, the more inhabitable it generally is. There is approximately one unit between each realm.

Planes of existence (z-axis)
A theory credited to Lord Gladius, the z-axis is different from the others in that all locations on the z-axis that share x- and y-coordinates are considered part of the same reality. It is something of an extension of timelines, only the differences between points are minute and completely magical. There is some evidence that the axis exists, but no one understands it at all.

Travel
The general method of traveling between realities is via magic portal. Occasionally, portals will spontaneously appear connecting a reality to an adjacent one, i.e. A(2.1, -1) may randomly connect to A(2.0, -1), A(2.2, -1), A(2.1, 0), or A(2.1, -2). Any other portal must be opened magically, and that magic is a secret guarded by a very select few. Most of the time, less than a dozen people across all known universes know dimensional magic, excluding the Gatekeepers.