I'm the True Mechanic Emperor

There was an endless expanse of white, without any matter present. It just resembled a white, blank space.

Suddenly, a blue vortex appeared out of thin air. Han Xiao and the rest flew out of this portal.

Joey sent out a spiritual message. "This is a prototype of a secondary dimension that I've created. Generally, we all spar with each other here to improve ourselves. You have no problem with this, right, Black Star?"

"Sure."

Han Xiao surveyed his surroundings before nodding in assent.

After reaching a consensus to spar, they decided to change the location due to the fear of destroying their own base. Joey opened a portal, leading everyone to his usual training site.

Advanced mages could utilize magic such as fantasy realization to artificially create secondary dimensions. This white world was merely an imperfect prototype, very simple to manufacture.