Because Spirit Stones were widely used, they gradually replaced money and became a form of currency that circulated on a small scale within the Wulin Community.
After all, to cultivators, mundane money had lost its value, just like the Crimson Flame Sword on Ye Wutian's back could never be bought with money.
After putting the five Spirit Stones back into his pouch, Ye Wutian rummaged through the rest of his items, which were just some cash and miscellaneous cards.
What caught Ye Wutian's interest were the five seemingly identical black cards among them. He casually picked one up and flipped it over to look at the front.
The front of the card was printed with three black characters: "Spirit Stone Card."
Ordinary bank cards in the secular world were used to store money, whereas these Spirit Stone Cards were naturally used for storing Spirit Stones.