If You Can't Conceive a Baby, How Can You Become an Immortal?

Xu Yang, who was fleeing, strayed into the mountains and a cave and saw an ancient corpse. The soul of the ancient corpse was not extinguished. He taught Xu Yang how to practice, letting him memorize it but not practice it. When leaving, he left Xu Yang with a piece of advice. "If you want to truly ascend, you must not conceive a baby!"