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Chapter 397 - Leading Deployment

Zhong Yihan studied here for three days.

He basically read the well-preserved books in the library, and then began to deduce the format.

After that, he spent another two days in various front lines on the mountain, observing and observing in person. If he did not understand, he would go to the old man to ask.

A total of five days, Zhong Yihan finally mastered the trick of protective mountain formation.

Even his understanding of this protective mountain formation is much better than that of the old man.

"Here, can't use red blood crystal, want to use blood moon fairy ice. The energy provided by red blood crystals is not good enough to support the whole formation. "

the old man said: "But we don't have blood moon fairy ice!"

"Yes, it can be extracted and refined twice through red blood crystal. It is written in the book."

the old man clapped their heads and said, "It is true that you have done the same research on the formation, I admire you!"