Parallel Universes

Parallel Universes exists adjacent to our universe, when you reach the edge of our physical universe there is a border of spacelessness, before another physical space exists. Each parallel universe is self-contained, and follows the same laws of physics as the others, but because nothingness exists between them they cannot be traveled to physically.

Concurrently

 * They exist separately, but alongside other Universes, within a Multiverse.

Above

 * They each have their own Astral Plane, Land of the Dead and Land of Legend.

Super Above

 * The Personified Planes and The Primordial Planes bleed energy into all Multiverses directly, but the return is not possible physically.

Trivia

 * Parallel universes evolve differently from each other, humans do not exist in parallel universes unless they migrated through the Holy Planes, Land of the Fae, or The Infinite Abyss.
 * They possess a unique Astral Plane, and the other planes which exist directly with their Universe. They also do not intersect with each other.
 * The collective of multiple universes is known as a Multiverse, each multiverse has its on set of physical laws.