Undying substance, also known as longevity substance, is a special material that Emperor level experts in this Fang Yuan World crave intensely.
Not only can it allow one's own transformation to the extreme, but more importantly, it can also extend life span.
It is said that in the distant past, the undying substance was extremely abundant in the world, giving birth to one supreme emperor after another.
These emperors absorbed a large amount of undying substance, extending their life span far beyond a million years, with combat power so strong that it could nearly shake the Red Dust Immortals.
Within the Tianyuan Emperor Palace.
Lin Yuan sat cross-legged, gazing with astonishment at the strand of undying substance in front of him, seemingly tangible.
Condensing this strand of undying substance took Lin Yuan more than a day's effort.
Yet it surpassed the amount of undying substance accumulated by Emperor Tianyuan over two million years.
