It could be said that of the first 6 realms of cultivation, the Nascent Soul Realm was the one with the greatest combat difference between the weak and the strong.
That was something that didn't have to do with cultivation base, but with how many times you had undergone a cycle of tempering your nascent soul.
Just before the exit of the undead world opened, it was very likely that the Devil Kins and the sect disciples would undergo an immense battle.
Although he had been informed that there were many entrances to the undead world, there was only one exit. That exit was located in the most core place of the undead world.
There was a huge mountain valley there. That place had been called Netherbound Valley. When the undead world's exit opened, a teleportation gate would open in front of Netherbound Valley.
By activating the special token each person had on their body, they would be sent out of the secret realm.