Within one of the stone rooms of the Area 52 Inheritance.
"Well then, this is definitely leagues beyond the previous version of the skill. If this was an extremely rare skill, then the difference might be more obvious." After skimming through the description of the newly evolved skill, Aurus could not help but mutter and sigh in amazement as to how much the skill has improved.
The previous version of the skill, [Boundless Spirit Tempering], at its max level, would only give a stat boost of 30% to Aurus' base stats. That's it.
But now that Aurus has evolved it to [Essence Refinement] (shortened because who would want to read the full name many times), this stat boost was increased to 50 percent, and that boost was not even from the max level of the skill, allowing one to see the might of a Transcendent grade skill when compared to a Mortal grade skill. Not only that, the skill also obtained another effect, which enhanced the efficacy of soul-based techniques by 50 percent.