Limbo

Limbo also known as the Zero Dimension, is a location that lies between the different worlds of Vampyres, Knights and Boobs.

Summary
The zero-dimension is the gap that exists between the three worlds (Earth, Heaven, and the Hell) and Yggdrasil and is considered a void world, existing alongside the Dimensional Gap.

Appearance
Limbo is described by Jin and Ophis as an endless desolate void of nothingness.