Pre-universe

The Pre-Universe was the universe which came before this one. After the destruction of the Pre-Universe, some species found their way into this universe, and some (such as the Old Ones) ended up with god-like powers. (NA: All-Consuming Fire, MA: Millennial Rites)

The Beast claimed to have originated before the universe, as well as to have been imprisoned by the Disciples of the Light, likely placing both in the Pre-Universe. (DW: The Impossible Planet / The Satan Pit). However, The Beasts actual claim, that he existed "before time" could be an indication that he existed before any universe, or at least any form of universe stable enough to allow a passage and structure of time.

Abaddon also came from this period and was imprisoned around this time (TW: End of Days)