Planes

A plane is a self-contained world of variable size. Planes can be governed by any set of rules and natural laws, though it is typical for them to follow rules and laws similar to Earth.

Most planes do resemble Earth in that they possess an oxygenated atmosphere, high quantities of water, and similar aspects, though do possess differences to make them unique. The size and details of a plane can vary greatly, being the size of a continent to an entire planet, and is highly dependent on the purpose the plane was designed for.

Storyline
The planes encountered are created with the purpose of testing the effects of evolutionary stressors and to provide natural homes and easy access to past experiments. While there are finite number of planes, given their artificial design, there is the potential for an infinite number of them. Each plane is separated by the Abyss, which is filled with various chaotic energies. The creatures of these planes do not typically interact with each other, except for events known as Rifts.

Rifts
Rifts are a phenomena that can occur both naturally and artificially. The fabric of the planes is made to be intentionally weak. This can lead to events known as Rifts. A rift is a linkage between two planes, resulting in an exchange of flora, fauna, and energies. These rifts are often very short-lived, and serve as a way to provide semi-natural ways for observers to see the interactions of things that wouldnt normally interact.