Top-grade Spirit Stone.
It must be birthed within an upper-grade Spirit Vein, and even these upper-grade Spirit Veins may not necessarily have it.
Even if the very few that do, they only have 1.
Once it is taken away, the entire vein's effect, whether it's the ability to gather Spiritual Qi or the ability to produce Spirit Stones, will greatly decrease.
So, even if these large sects' Spirit Veins have top-grade Spirit Stones, they are often unwilling to take them out.
"Storing them in the Spirit Vein actually gives me an opportunity."
Ji Yuan instinctively had an idea in his heart.
As for trading... that's an option, but the cost is rather high.
The usual exchange ratio for Spirit Stones is one hundred to one.
100 Mid-grade Spirit Stones can be exchanged for 1 Upper-grade Spirit Stone.
Even with some fluctuation, it usually varies by a few, not exceeding 10.
