章 835: Legend of the Crimson Dragon Emperor, Praise the Emperor! (3)

"How do you set these prices? Are there any unified standards, such as Aether Stones?" Levi asked.

"As the owner of the Truth Magic Mirror, you can perfect the knowledge management system of the magic mirror as long as it doesn't violate the Principle of Equal Exchange. However, some knowledge is very difficult to measure with Aether Stones..." Otharos said.

"I understand."

This Principle of Equal Exchange was a hard standard. It was the first rule when Sauron created this Wizard Tool. Even Levi, as the owner of the magic mirror, could not get knowledge from it for free.

"If other people want to exchange knowledge from you, what do they need to do?" Levi asked.

"First, they need to obtain your authorization authority. Then, recite the incantation [Mirror, Mirror...] silently. Finally, pay the corresponding price and they can obtain knowledge from it."

"Understood." Levi understood.