Eternal life
Father Tree Descartes raised his face and looked at Robin seriously, "What we found that day was the secret of eternal life."
"..Secret of what?" Robin and Billy both stammered in stupefaction, they were both extremely dumbfounded.
Theoretically, someone at the top of the Sage Realm could live for more than 4,000 years, but in the entire history of Jura, no one was known to have reached this age, even Old Gu, who is considered one of the oldest pillars in the True Beginning Army, is an expert at the top of the Sage Realm and is almost places a foot in the Emperor realm, is barely over two thousand years old!
4 thousand years... This period of time is equivalent to 40~50 generations of any mortal family, equivalent to the rise and fall of kingdoms, the emergence and disappearance of races!