Hardiles City, a detached house several kilometers away from the academy.
In a basement over a hundred square meters, there was nothing except for a barrier that nearly occupied the entire underground space.
Inside the barrier, numerous elements were densely packed: gold, wood, water, fire, earth, wind, lightning, ice, light, and darkness—the Ten Constant Elements were all present!
Yang Aoshan's research focused on the compound effects among multiple elements.
This barrier was Yang Aoshan's most cherished creation. If this less-than-a-hundred-meter Barrier Model could achieve a breakthrough, Yang Aoshan might be able to use it as a foundation to construct a true Sixth-Level Barrier, thereby ascending to the rank of Barrier Master!
Back then, the reason Yang Aoshan came to the North was to fill the knowledge gaps regarding the "light" and "dark" elements.
