Depending on the cultivator's realm, it could grant roughly a hundred years of cultivation at the Nascent Soul late stage, a hundred and fifty years at the middle stage, or two hundred years at the early stage.
Of course, these were only rough estimates. The exact results would vary from person to person.
Like dragon-transforming grass, the Immortal Source Fruit had gradually died out since middle antiquity, with no further word of it by late antiquity.
Still, it was far inferior to the nine-illusion immortal spirit herb.
After all, the Immortal Source Fruit could only increase cultivation, not break through bottlenecks. Once a cultivator encountered a bottleneck, its effects became negligible.
The nine-illusion immortal spirit herb, however, could not only greatly increase cultivation but also surpassed the Truth-Restoring Pill in breaking through bottlenecks.
The difference was immediately apparent.
Even so, a single fruit could grant a hundred years or more of cultivation, enough to send countless True Lords and Demon Kings flocking to it.
Although True Lords and Demon Kings had long lifespans, those seeking higher realms still needed to complete their cultivation in the Nascent Soul realm as quickly as possible, leaving enough time to prepare for breaking through the Spirit Transformation bottleneck.
Whether spirit herbs, spirit treasures, or spirit pills, anything that could grant a hundred years of cultivation was exceedingly precious, worth a life-and-death struggle between fourth-tier beings.
Yet even in ancient times, such scarce resources could be counted on one hand. Now, they were rarer still.
As far as Liu Yu knew, the only resource in the present Cultivation World with effects comparable to the Immortal Source Fruit was the Nascent Soul Cultivation Pill, one of the Three Treasures of Nascent Soul Formation.
However, several key ingredients required to refine the Nascent Soul Cultivation Pill had