The Essence Core Technique was the method of refining Hidden Dust Sand into a cultivator's Second Golden Core.
Moreover, because this core could have a chance to advance into a Nascent Soul in the future and become a Second Nascent Soul, it was called an "Essence Core."
Compared to a Golden Core, a refined Essence Core was virtually no different.
In some respects, it was even superior!
It would not be restricted by a cultivator's minor realm divisions and possessed extremely strong potential for growth.
Its upper limit was determined solely by the grade of the Hidden Dust Sand.
In other words, with the Tier 3 Great Perfection Hidden Dust Sand in Luo Chen's possession, so long as he refined it properly, Luo Chen himself could be at the Golden Core Fourth Layer while the Essence Core possessed a realm comparable to the Late Stage Golden Core.
What did that mean?
One only needed to think about it to understand.
It meant Luo Chen could possess double, or even several times, his current mana reserves!
If Luo Chen had possessed an Essence Core during that previous battle, he would not have been stretched thin for mana. He could have unleashed all manner of large-scale spells without hesitation.
Not to mention an encirclement by six or seven people—even if there had been more, he would have remained utterly unafraid.
On this point alone, the Essence Core Technique was worth tens of millions!
And if the Essence Core could be developed to the level of a Second Nascent Soul in the future, its value would become even more immeasurable!
It would no longer be a secret art whose worth could be measured in Spirit Stones.
Not to mention that Luo Chen also possessed a Nascent Soul Pill Recipe that ordinary Golden Core