I see. It appears in manga, an impression like borrowing power from the spirits of the deceased. In other words, it would be like a magic user and a spirit user by RPG classifications.
"Can it be used without cost?" (Naofumi)
"If you use the same medium too much, the borrowed amount will decrease. Incidentally, it will take some time to recover." (Gaelion)
"Is that so." (Naofumi)
"Also...it is possible to draw power from the precious metals of gems. They have lots of power." (Gaelion)
"Hm? Is it different from magic power?" (Naofumi)
"I'm guessing you mean in gem processing. Strictly speaking they differ. That is a technique that pours magic power into gems to release the power inside it. Dragon Pulse contrarily extracts from it." (Gaelion)