Supreme-Grade Spirit Stones.
They were born only in Superior-Grade Spirit Veins, and even then, not every such vein had one.
Even among the rare veins that did, there was only one.
Once it was removed, the entire Spirit Vein's effectiveness—both its ability to gather spiritual energy and its ability to produce Spirit Stones—would suffer badly.
That was why, even if a major sect's Spirit Vein contained a Supreme-Grade Spirit Stone, the sect was usually unwilling to take it out.
"Keeping it inside the Spirit Vein gives me an opening."
An idea sprang to Ji Yuan's mind.
Trading for one was an option, but the price would be steep.
The usual exchange rate for Spirit Stones was one hundred to one.
A hundred Middle-Grade Spirit Stones could be exchanged for one High-Grade Spirit Stone.
Even when the rate fluctuated, it was generally by only a few stones, never more than ten.
Supreme-Grade Spirit Stones were different. Forget a hundred High-Grade Spirit Stones—even a thousand might not persuade a cultivator to trade one away.
That was because Supreme-Grade Spirit Stones had another vital use: they were essential when a Nascent Soul Cultivator advanced to Spirit Transformation.
Without the spiritual energy of a Supreme-Grade Spirit Stone to replenish them, the energy from High-Grade Spirit Stones alone was nowhere near enough to sustain a Nascent Soul Cultivator's breakthrough.
So even Nascent Soul Cultivators who possessed a Supreme-Grade Spirit Stone were unwilling to trade it.
One Supreme-Grade Spirit Stone could fetch a thousand High-Grade Spirit Stones, but a thousand High-Grade Spirit Stones could scarcely buy one Supreme-Grade Spirit Stone.
That was the reality.
"As for the remaining five drops of Ten-Thousand-Year Spirit Milk, I've already gathered three. The last two should be manageable."
After thinking it over, Ji Yuan put the [Spirit Vein] on his