The Ascension.

Shi Lang and the allied forces returned to their homes quickly after the battle finished. The heavenly tribulation destroyed the demon planet, and the allied forces ensured that none of the remnants of the demonic energy survived. 

The five centurion beasts took away the remnant bones and did not tell anyone of the people anything. The people asked how shall they guard those bones when they all passed away, and the elders told them to wait for a message. The day they were about to die, they would call for the other old relics to replace them if the practitioners did not manage to advance. 

The people were worried, and Shi Lang vouched that the elders would live a steady life for fifty years. If they managed to conserve their spirit energy to the optimal state, the time would extend to a century.