In order to establish the Rebirth Secret Realm, that powerful entity once used a plethora of resources.
Originally, after the death of that powerful entity, these resources wouldn't remain, and tens of thousands of years would have been enough for some strong practitioners to divide them among themselves.
Yet, it's unknown what that founder of the Rebirth Secret Realm did; all the resources within the Secret Realm vanished after the brilliance fifteen thousand years ago. Even when a Twelfth Realm practitioner came, no resource storage place was discovered.
The Twelfth Realm couldn't guard the resources perpetually, thus they didn't continue to intervene, leading to the gradual decline of the Rebirth Secret Realm.
Until later, those resources would occasionally appear within the Secret Realm.
After news spread, the Rebirth Secret Realm returned to the public eye, drawing a large number of cultivators to explore it.
