The Dark Multiverse

The Dark Multiverse is a realm of chaos beyond our scope of reality, and is accessible only through a permeable cosmic membrane at the edge of our universe. It consists of a seemingly endless amount of Alternate Earths, all with their own histories (usually warped versions of our own history) and endings.

Only a few human beings have entered the Dark Multiverse, as such technology required to break the cosmic membrane is extremely rare and kept secret by the world's governments.