The poison was so strong that it was easy to fall for it.
The upper realm was actually an undeveloped land in the wilderness, so there were many dangerous lands.
Even after so many years, the dangerous lands had not been cleared. Because there was a lack of rule masters, there were even some powerful existences in some dangerous lands, and even heavenly kings could easily fall!
As time passed, these dangerous lands became places that everyone avoided. Unless it was absolutely necessary, ordinary people would not come.
The reason why the human race occupied these dangerous lands was because they had no way out.
The more dangerous it was, the more they would go there. This could prevent some experts from attacking them.