There are twenty Low-level Netherworld Crystal Stones, five Intermediate Netherworld Crystal Stones, and only one High-level Netherworld Crystal Stone.
If these Netherworld Crystal Stones were to be converted into Black Crystal Stones, even Jing Yan cannot be certain of their exact value.
"While there is still some time before the Yellow Spring Cave opens, I should now practice the Fourth Layer of the Great Demon Seal Suppression Technique," Jing Yan thought to himself.
