The Void

The Void isn't a being (or is it?) but a concept. The uncaring Void is what everything will go to. When the Cube will be destroyed, Tethys with it, it will be devoured by the Void, the Everchaos. The cults that follow the Void seek the destruction of the planes and work on making breaches in the Cube to allow their master to send more creatures into the world. Those who are the most loyal receive powers beyond mortal imagination, some speak about neverending darkness that is capable of swallowing even the creatures of the Shadow Reflection. These cultists are named the Voidbringers.