Lightning essence.
The essence of lightning.
It was a natural treasure that could only emerge in regions perpetually wracked by lightning, after at least a hundred years of development.
It could not only aid those with the lightning attribute in cultivation, but also be used to refine pills.
Through an alchemist's pill-refining arts, which could turn decay into miracles, its vast energy could be transformed into pills that anyone could absorb, regardless of their attribute.
Any pill that used this substance as an ingredient was at least sixth-tier!
Lightning essence could even be used to refine seventh-tier pills!
However, the origin of that piece of lightning essence from back then was unknown. No one knew where it had been obtained.
Most people did not even know the conditions required for lightning essence to form.
Many had come to Thousand Thunder Valley in search of it, only for most to return empty-handed.
The reason was that they had never ventured as deep as Zhou Changqing had now.
Of course, Zhou Changqing knew nothing of all this.
But that did not stop him from recognizing its value.
Sensing the enormous energy within the lightning essence once more, Zhou Changqing's eyes flickered.
"This Thousand Thunder Valley really is miraculous, to think it could nurture such a treasure."
He grew increasingly curious about how Thousand Thunder Valley had formed.
If it could produce one such treasure, there would surely be a second.
At that thought, anticipation stirred in Zhou Changqing's heart, tempting him to head inside again.
He had an intuition that the secret of Thousand Thunder Valley lay at the center of the Thunder Sea, waiting for him to uncover it!
But recalling his current condition, Zhou Changqing shook his head and suppressed that impulse.
He was already near his limit. If he