The most important thing is the Forbidden Soul Bowl Ye Hao swallowed...
The Forbidden Soul Bowl, as the name suggests, can preserve a person's soul within it. If someone with great power, or someone deliberately collecting a soul, puts the soul into this bowl, it can keep a person's soul intact for several years, hundreds, or even thousands or tens of thousands of years, until one day the soul finds a suitable body to parasitize.
This shows how important the Forbidden Soul Bowl is. After all, the longer a soul exists, the greater the chance it will find a suitable body to inhabit.
The reason the Thunder Emperor could leave his soul from the late cultivation era to today is because of the existence of this Forbidden Soul Bowl; otherwise, he would have long disappeared and vanished into dust.
The Forbidden Soul Bowl also has a particularly important function, which is that the stronger Ye Hao's power gets, the more he can learn about the secret history of the past.
