With two more helpers at his side, the experiment made tremendous progress.
The Ghost Domains of the Ghost Eyes stacked upon one another, always producing many unexpected effects.
A single Ghost Eye could do only so much, but two or three Ghost Eyes meant limitless possibilities.
For example, Yang Jian activated the fourth layer of the Ghost Domain.
The fourth layer was a Ghost Domain shrouded in ghost fire. When it overlapped with the fifth layer, that world of ghost fire could be concealed. If the sixth layer was added as well, the ghost fire could remain for a long time instead of dispersing immediately.
By the same logic, if a fourth Yang Jian's Ghost Domain were added, there would be an entirely new change.
This qualitative transformation surprised even Yang Jian himself.
"No matter what kind of change it is, we first need to establish the most basic plan: how to make the Ghost Domain affect Yin-Yang Road for the longest possible time." Yang Jian knew very clearly what he needed to do, so he was not anxious. He proceeded steadily in that direction.
As Yang Jian continued his attempts, nearly four hours passed.
Only then did Zhang Xianguang break free from Yin-Yang Road and return.
"It seems the effect of my new Ghost Domain is even better than I imagined. It actually trapped you for four hours. What do you think? Give me an assessment," Yang Jian said.
Zhang Xianguang did not feel embarrassed at all. Instead, he became somewhat excited. "I tried that Ghost Domain. Its effect is indeed very good. Even I couldn't escape easily. I estimate that this Ghost Domain can last at least three years, but during those three years, its supernatural power will continuously weaken. The truly effective period is probably two and