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Essence Energy permeated between heaven and earth, omnipresent.
However, only martial artists who have reached the Heaven Level Realm or who possess an Innate Spiritual Root could communicate with heaven and earth, sense the existence of Essence Energy, and then, with the help of some special cultivation techniques, absorb Essence Energy for cultivation.
The Essence Stones stacked in the stadium had been buried deep underground for millions of years, each originally containing a trace of Essence Energy. However, the majority of Essence Stones, upon being mined and exposed for too long, had almost completely dissipated their Essence Energy.
Only martial artists with a keen sensitivity to Heaven and Earth Origin Energy like Fang Bai could detect the faint presence of Essence Energy within the heaps of stones.