Planar void

A planar void is speculated to be a plane without worlds in them, mainly because of the existence of the Nether Void and the Lord of the Void. More often, the planar void is thought to be synonymous to the Aether and/or the Blind Eternities. This is especially seen in the name of certain Eldrazi on Zendikar. The Voidmages of Vryn can interact with the void, as well as some mages from Drunau on Innistrad.

In-game it is the place where creatures go when they are exiled.

In-game references
Represented in:
 * Planar Void

Referenced:
 * Chalice of the Void
 * Into the Void
 * Leyline of the Void
 * Lord of the Void
 * Separatist Voidmage
 * Touch of the Void
 * Voices from the Void</c>
 * Void Attendant</c>
 * Void Grafter</c>
 * Void Maw</c>
 * Void Snare</c>
 * Void Stalker</c>
 * Void Winnower</c>
 * Voidmage Apprentice</c>
 * Voidmage Husher</c>
 * Voidmage Prodigy</c>
 * Voidwalk</c>
 * Voidwielder</c>