Grey read through all of them one by one, and eventually Manager Earl spoke up.
"Young Master Grey, usually people opt for bone tempering or skin refinement first," Manager Earl explained patiently. "Marrow cleansing and blood refinement, on the other hand, require immense amounts of energy and a pure source to fuel them. The resources needed are… extravagant, to say the least."
He picked up a digital scroll labeled Copper Flesh Tempering Technique and handed it over.
"This technique is the most commonly practiced body tempering and skin refinement method," Manager Earl continued. "Originally, it was part of the Martial Evolutionary Path, but the great scholars of our Blue Star managed to adapt it so that anyone can cultivate it."
His lips curved into a polished, professional smile. "Of course, since you're buying it purely for research, you need not concern yourself with such details."
