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Feng Jun's answer shattered Elder Guo's wishful thinking, "This is a self-circulating formation, which requires a Spirit Stone to operate. After the Spirit Stone is exhausted, it can maintain the spiritual energy by absorbing sunlight, thus keeping the formation running."
Truth be told, it was only after he had entered the Spirit Fields that he began to roughly understand the structure of the formation.
It must be said that the Earth Realm truly isn't lacking in astonishing cultivation geniuses who actually combined the Hidden Formation and the Lingzhi Formation, and did so with the smallest of costs.
Once the formation is activated, it basically enters a state of self-circulation, ingeniously utilizing sunlight to bioengineer all things.
Feng Jun even wondered whether Spirit Stones were really needed to start the formation. He felt that if one could input a certain amount of spiritual energy, it might achieve the same effect.
