Over the past ten years, the Nether Lifespan continuously replenished into the realm had basically been largely exhausted through the method of conferring titles.
"So this was it... the thing Senior Yunhe gave you... To have the authority to confer titles upon righteous gods of the Underworld—such power must certainly surpass that of the Yama Monarchs in the Minor Underworld..."
Combining various clues, Pu Yuanzhu arrived at a conclusion.
Chapter 462