The moment the rules of heaven and earth appeared on Xiao Shi, he knew that Yan Huagu's Rule of Heaven and Earth was actually the Rule of Spatial. This was an extremely rare, special, and powerful rule. A demigod with such rules of the world could even travel through space to a certain extent.
Presumably, this was also an important reason why Yan Huagu could seal and suppress the four eras. Although the suppression of the seal mainly relied on the power of a High God, the power of a High God was not omnipotent.
It was just like how Yan Huagu wanted to suppress and seal the era of evil ghosts. He had to appear in the Era of Evil Ghosts first.
This could not help but make Xiao Shi realize
The Era of Evil Ghosts might also exist in spacetime outside the Tianwu Continent like the Beginner Martial Era. This allowed Yan Huagu to travel through spacetime and enter the Era of Evil Ghosts to suppress and seal it.