Spirit Stones are a universal currency in the Nine Heavens and Ten Earths. However, for high-level transactions, Cultivators from the Nine Heavens often use only Immortal Spirit Stones.
These are a special type of ore that exists only in the world of the Nine Heavens. Their Spiritual Energy is countless times richer than that of ordinary Spirit Stones. Moreover, they contain a wisp of Immortal Qi that can replenish the Mana of Earth Immortals at the Transcendence Tribulation Stage and above, making them exceptionally high-quality. It's just that their production is relatively scarce, so their value is naturally higher.
