Nothing

"An inter-heavenly spatial formation…" Yan Zaizen slowly muttered. A spatial formation was essentially the door to an entry into a tunnel. This tunnel typically traveled through the spatial void, a layer of space in a similar way to chaotic space.

However, if chaotic space and the spatial void were to be compared, it wouldn't be close.

Chaotic space was the glue to all forms and layers of space and different flows of time. A background layer behind all other layers. Regardless if its self-created or natural, all spatial layers connect to chaotic space. The only exception was distorted space.

The spatial void didn't have a different flow of time, but the distance traveled in the spatial void is magnified considerably. A single step through the void can be as long as a mile.