Nether

Nether (or Void, The Nether, The Unknown) is a part of space-time continuum within the partial borders of the Multiverse. Multiverse is made of a lot of standalone universes, and those universes have bonds with each other, togetherly forming the Multiverse. The space-time between those universes, and those bonds connecting them are called Nether or The Nether. This place is mysterious and looks like a black hole, albeit has some of its characteristics.

Namely, before Multiverse and the Otherworlds (Fifth Dimension) combined, there were two separate Nethers, and the two were started to gravitationally pull towards each other, threatening the destruction of the Multiverse. When Frost Klyder became the Cosmic Judge and Guardian, he binded these two universes (Multiverse and Otherworlds) and the two Nethers instantly became one, and also changing their size, shape and colour.

Purpose
Nether was thought to be useless empty void in the early stages of the Multiverse, however, that has changed considering the fact that it was proved that the collapsed and/or destroyed universes travel to this part of space and were shattered to atoms and molecules, by its inhabitants, the Blind Ones, and laterby those atoms powered up their contructs, doing an endless cycle.

G-Theory
G-Theory consists of a hypothesis that the whole Multiverse was born from the Nether, also it states that a being called Galaxarian, made from shattered parts of some universes, was born in this part of space.

Spectrum of Sight
This is a device-being that represents blindness of everyone and everything, how everything will end and the apocalypse itself. This Spectrum of Sight was connected to Paper of Mysteries

Conditions
Humans and mortals were proven to be unable to comprehend the Nether itself, namely only Blind Ones are inhabiting it and working in an endless cycle, albeit being only ones to be able to comprehend it and live within it