The Successor Crown Prince system was the core system of the Thousand Poison Sect for tens of thousands of years. It was also related to the choice of the sect master and the choice of the various Mountain Chieftains. One could imagine how important it was.
The most outstanding one in the legacy competition was qualified to be selected as the new sect master of the Ten Thousand Poison Sect. He would rule the super immortal sect and have supreme power.
The legacy crown prince who performed well in each mountain range in the legacy competition had the qualifications to become the new Mountain Lord and lead the mountain ranges. He also had earth-shattering power.
Whether it was the Thousand Poisons Sect Master or the Mountain Chieftains of the various mountain ranges, they were all replaced once every thousand years. It was the same for the legacy Crown Prince. He could not remain in the position forever.