The lifespan of the Emperors was very long, but it was not truly longevity!
Even the Emperors would face the situation of dying of old age.
In ancient times, all kinds of methods to extend one's lifespan were invented. Some used pills to extend one's lifespan, some used divine arts to extend one's lifespan, and some used devouring origin energy to extend one's lifespan.
It was just that Emperors were too powerful, so powerful that it was useless if one did not have the same level of Emperor essence.
This was because the life essence of Emperors was already close to the level of laws. Ordinary flesh and blood creatures were meaningless to them.
To devour live longer, they had to devour the same level of Emperor essence!
However, in ancient times, this was simply impossible!