Oblivion

The interplanar void, or oblivion, separates the planes of Gybachi, the After, and Kuulae, although how this works is unclear. It likely is either similar to outer space, which would imply the planes were similar to planets, or some sort of barrier between the planes more like a wall. It seems to consist of empty space that destroys anything that enters it.

Geography
There is no apparent geography in oblivion, merely an empty void that destroys everything that enters it.

Life
It has been stated that life cannot, at least as far as is known, exist within oblivion. Therefore, oblivion lacks any variety of life, as even that which enters it is destroyed.