RIFT

Subspace Rifts, gaps, or simply rifts, are passageways left between universes. Those passageways are natural and cannot be destroyed, blocked or created. They exist based on a theory that the universes aren't completely separated from each other, but connected like if they were only one universe, called multiverse. Those rifts are also very well hidden, being necessary a very bad luck to cross one accidentally, or find one just searching.

Law of Rifts
There's some definitions for something be classified as Rift. Those are:
 * A Rift cannot be created, modified, destroyed or blocked by any external power.
 * A Rift does not have a visible form. There's no visual influences near or inside a rift. However objects or persons can partially disappear if they cross partially a rift.
 * A Rift cannot be tracked or sensed by any means. There's no physical, spectral, atomic or any other kind of influence to be used as sign that might be a rift there. Not even magic can sense a rift. They are completely metaphysical.
 * No Physical Disturbance can affect a rift.

Link Factor
Although not being possible to locate the exact location of a rift, it is possible to discover if there's a rift somewhere through the Link Factor. This factor is a group of studies and calculations made to determine where is possible to have a rift, and where it links to. Facts like culture, history, population, technology, science and even people are important to determine the possibility. The Factor also determine how strong is the rift linked and the stability of it.

Stability
The stability of a RIFT, and the side effects of an unstable rift are directly connected to the Link Factor. If the factor is small, then the stability is also small.


 * Stable Rifts have shorter links, because the universe is more closer to the another one due to its similarities identified by the Link Factor. Usually, the place that link those universes is always the same.


 * Unstable Rifts have longer links, because the universe is far from the another due to the Link Factor be small. Unstable Rifts does not have a set place inside the universe, always changing to try find a more stable place and close to the another universe.

Examples
The most common cases of rifts, are those that connect to alternate versions of the same place, because the Link Factor is one of the strongest cases.

We also have rifts that connect between universes from another franchises, Mt. Itoi to Mt. Ebott for example, and Avalice to Earth.