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Essence is what transforms from the Five Grains.
Qi is the Inner Qi and True Qi.
Spirit is the Primordial Spirit and spiritual power.
But this common knowledge doesn't apply to the Heart Inquiry Saber Skill.
The Essence consumed by the Heart Inquiry Saber Skill is not from the Five Grains.
The Heart Inquiry Saber Skill channels the Essence, Qi, and Spirit of the whole body into one blade. Both Spirit and Qi can be restored, but Essence cannot be replenished; eating and sleeping won't bring it back.
So how can one replenish it?
The next morning, he found that his weakness and fatigue had greatly eased, but he hadn't fully recovered.
Falling into a deep sleep last night, he hadn't noticed the changes in his Insight body. Now awake, he had mostly recovered, and his Super Sense re-illuminated.
He re-detected the consumed strange aura.
This strange aura did not originate from the stomach or any other internal organs, but actually came from the bones.
