The Void was first described in detail in the Book of Aslarn, when the Elder Gods watched members of the First Circle approach the Void on their mission of diplomacy to meet with the Heralds of Magnora. It is a vast emptiness, devoid of even the energy that flowed through the aethers. It is a harsh place, without any physical temperature, and stretches farther than the imagination. It is anathema to existence itself and is difficult to travel through, as those with form and spirit rebel against being in a place where they do not belong.
There are beings that inhabit the Void, surprisingly enough; they are the Abominations, the failed creations of Dynara and the manifestation of the Void itself. Some Abominations are actually half-formed beings who traveled into the Void and become undone and reformed in their insanity.