Bingshuang said: "Don't underestimate these piano, chess, calligraphy and paintings! Take these, the books on the bookshelf on the rock wall, although they are not powerful weapons. However, it records the study of yin and yang techniques, the magic of Qimen Dunjia, and the arrangement of various defense systems, the practice of various divine beasts, and so on. Therefore, it can be said that these books are even more powerful than real weapons! If they are stolen by the enemy, it is even more difficult to use the methods recorded in them to make waves than to give them a sharp blade!"

So, as soon as Zang Feng heard Bingshuang say this, these books recorded all kinds of magical methods, and even included magical methods for refining divine beasts, so he naturally thought: "That magic weapon for controlling the enemy won't be the "Medicine Immortal Sutra" that records how to train divine beasts, right?" So, Zang Feng couldn't help asking: "Ah! So, that magic weapon that can subdue the seven-colored shadow man can't be the "Medicine Immortal Sutra" that I sent!"

Bing Shuang said: "I didn't say that the magic weapon to subdue the Seven Colored Shadow People is the 'Medicine Immortal Sutra'! If that magic weapon to control the enemy is really the 'Medicine Immortal Sutra', Ling Xu's master has already thoroughly eaten the various methods recorded in the 'Medicine Immortal Sutra'. Then, with the method in it, you can naturally subdue the seven-colored shadow man. But the master, why did you want me to lead the seven-colored shadow man to the snow-capped mountain area?"

Zang Feng listened and said, "Yes, the disciple heard the frost girl mention it before, although there are secret methods for refining divine beasts in the "Medicine Immortal Sutra", most of the medical theories recorded in it are medical principles for curing diseases and saving people. It seems that there is naturally no way to deal with the seven-colored shadow man! However, what is the position of this "Medicine Immortal Sutra" in our secret room at the bottom of the lake? Because there are so many books on the rock wall, they all look exactly the same, but the disciples can't see which one is the "Medicine Immortal Sutra" that attracted the flying knifeman?"

Frost listened, and didn't answer Zang Feng's question, but said, "What? You actually said that these books look exactly the same?"

Zang Feng said: "Yes, you see, aren't they all the same in appearance?"

Bing Shuang said: "That's just the same as the cover! The content inside is completely different!"

So, Zang Feng asked again: "Which one is the legendary "Medicine Immortal Sutra"?"

Bing Shuang said unhappily: "What are you looking for it now? We didn't come here to look for this Medicine Immortal Sutra!"

Zang Feng said embarrassedly: "The disciple is just a little curious!"

Bingshuang said: "Curious? Okay! Since you are curious, you might as well look for it yourself! Because, the "Medicine Immortal Sutra" is placed on the bookshelf in front of you!"

Zang Feng heard Frost's words, and immediately looked at the three rock walls in front of him, but saw that his eyes were full of books, and they all looked exactly the same, so he instantly broke out in a cold sweat and said: "The rock bookshelves on the rock walls on three sides are full of so many books, and the cover looks exactly the same. If you ask your disciples to open and inspect them one by one, I'm afraid that if you look for them for a year, you won't be able to find them!

'Bingshuang' smiled: "You are smart, so many books, together with that 'Medicine Immortal Sutra', are placed on the shelf, indeed, they play a role in hiding the placement of the 'Medicine Immortal Sutra'!

At this time, it aroused Zang Feng's curiosity even more, and he couldn't help asking: "Ah? What else do they do?"

Bing Shuang said: "Forget it! We still don't want to make extraneous branches! Now that I am in the Medicine Immortal Valley, the enemy is pressing the realm, we still hurry up to take the magic weapon to control the enemy, and then hurry out to fight with the Seven Colored Shadow Man, Flying Knife Warrior, etc.!"

However, Bingshuang's words just now had aroused Zang Feng's curiosity, and Zang Feng thought to himself that he had finally come to this secret room at the bottom of the lake once, and he must seize this opportunity to satisfy his curiosity. So at this time, Zang Feng had already put the question of what the magic weapon of controlling the enemy was, and at the moment, he just said: "The disciple is really curious, so please ask the frost girl to tell the disciple! What is the use of these books? What's more, it won't take long!"

Frost listened and said helplessly, "Okay! Since you are so curious, we will delay a little time." After a pause, he continued, "Do you remember that I said before that the power switch that controls our moving labyrinth is in this secret room?"

Zang Feng was reminded by Frost, and suddenly remembered, and said, "Yes, but this secret room is full of books, where is there any control switch? Why does Frost Girl ask so at this time? Could it be that these books are the switches that control Qimen Dunjia?"

Frost immediately replied, "Exactly!"

When Zang Feng heard this, he was even more incredulous, and hurriedly asked: "How can this book full of three rock walls be the switch that controls Qimen Dunjia, what is going on?"

Frost said: "We have limited time, and at the moment, we can only give you a brief explanation." ”

Zang Feng couldn't wait to say: "Okay!"

Frost continued: "Look at these three walls, in fact, on each side, there are ten thousand books. In this way, there are a total of 30,000 books on the shelves on three rock walls. And among these 30,000 books, each book is different! Therefore, these 30,000 books, with different positions and different order of arrangement, all form a different and unique sequence of arrangement. And each of the different permutations is equivalent to a unique string of control codes. And our Qimen Dunjia is controlled by this kind of control code! Therefore, the 30,000 books placed on this wall are the master control switch of my Medicine Immortal Valley Qimen Dunjia!"

Zang Feng listened to this and asked in surprise: "I see, I really didn't expect that the whole of these books that look exactly the same is the main switch of my Paqi Gate Dunjia! So, now these books are set to the highest level of my Paiqi Men Shield Armor! But ...... But ......" Zang Feng said a few times, but he didn't say anything.

Frost was impatient and asked, "But what?"

Zang Feng said: "However, if there is really a foreign enemy who enters the secret room at the bottom of the lake, changes the location of these books, and destroys the arrangement of the books, wouldn't it be necessary to close all of my Paqimen Dunjia?"