Radiation, Disease.

The long-haired man lowered his head and said, "Your Highness, you must be joking. If it weren't for your efforts in the past, our number one human race wouldn't have been able to control the celestial race. The Sacred Emperor has always been looking forward to the return of his ancestors. He has already made all the preparations to welcome you."

The Sacred Prince stroked his beard and smiled. "The time here is ten times longer than in the origin world. If he were to see me, I'm afraid he wouldn't be able to recognize me as an old man, right? Go, bring that medicinal herb to me. With this medicinal herb, I might be able to live for another few hundred years."

"Yes." The long-haired man slowly retreated, and one golden-robed man after another followed him out of the Divine Hall.

..