"Master Liu, here is my jade plaque." when he came to the library, Wang Kai handed his token to Liu Gongsheng.

"Well, that''s right, go in." after carefully checking the token in Wang Kai''s hand, Liu Gongsheng nodded and immediately motioned Wang Kai and Ning Yutan to enter the library hall.

This time, Wang Kai and Ning Yuchen went straight to the fourth floor of the library hall. Compared with the third floor of the library hall, the number of classics here decreased sharply again, only about 10000. However, considering that these classics are the cultivation tips of soul emperors and soul masters at the soul Saint level, it is not surprising that there are 10000 copies.

Compared with the Wuhun hall, the number of soul masters in the Qibao Liuli sect is still a lot less. In the Qibao Liuli sect, only about 100 soul masters with spiritual emperor and above accomplishments can be born every 20 years. In addition, many soul masters do not like to leave their own cultivation feelings to future generations, even though the Qibao Liuli sect has been inherited for thousands of years, The number of these classics recording the spiritual cultivation and understanding of soul masters above the soul emperor level will not be too many.

Compared with the books on the first three floors of the library, the classics on the fourth floor of the library are undoubtedly much more precious. Therefore, unlike the books on the first three floors of the library, the classics on the fourth floor of the library are not directly placed on the bookshelf, but stored in transparent jade book boxes.

When he opened a jade box, Wang Kai opened the classics contained in it, which recorded the practice experience and Enlightenment of a soul master. Although the pages are slightly yellow, they are slightly rubbed. The materials of the pages of this ancient book are much more precious than those of the first three layers, and the corresponding durability has been greatly improved.

While telling Xiaoguang to start scanning, Wang Kai walked slowly around the fourth floor of the library. Although these books are packed in jade boxes, Xiaoguang''s scanning ability can still read the information of ancient books through the jade boxes. Of course, at the cost of this, the scanning efficiency will be slightly reduced, but it is also better than Wang Kai''s browsing one by one.

In half an hour.

"End of scanning! A total of 9086 books were scanned this time, and the deduction degree of world rules increased from 55% to 62%, a total increase of 7%!"

After scanning all the books on the fourth floor of the library hall, Xiaoguang also truthfully reported to Wang Kai. Listening to Xiaoguang''s voice ringing in his sea of knowledge, Wang Kai nodded with satisfaction.

Compared with the books on the third floor of the library hall, although the number of books on the fourth floor of the library hall is nearly 80% less, their value is undoubtedly much higher. Even if the number is much less, they still have a great effect on the deduction of world rules.

"Chen''er, let''s go to the fifth floor to have a look!" Wang Kai turned and said to Ning Yuchen as he put the classics back into the jade box.

"Childe, aren''t you satisfied with these books on the fourth floor?" Ning Yuchen asked softly after listening to Wang Kai''s words.

"I''m not dissatisfied, but I don''t have much time to stay in the library hall. Since Lord Ning gave me this opportunity, I still want to see the cultivation experience of those predecessors of soul Douluo and Title Douluo." while pulling Ning Yutan to the fifth floor of the library hall, Wang Kai explained.

Different from the entrance of the first four floors of the library hall, there is a light yellow light film in front of the fifth floor of the library hall.

"Is this the array of the library hall?" looking at the light film in front of him, Wang Kai also asked Ning Yuchen.

"You guessed right, Mr. Wang Kai. This is indeed the array to guard our Qibao Liuli sect library hall. Do you see this light film? Although it has no attack ability, if it rashly passes through the light film without carrying the corresponding identity token, the corresponding mechanism will trigger and lock the intruder between the stairs on the two floors of the library hall. At the same time, it will send a message to the elders guarding outside Give a warning to inform that someone has broken into the library. "

"I see!" looking at the light film in front of him, Wang Kai nodded if he got anything, and then said to Ning Yuchen.

"Mr. Wang Kai, my status jade card level is not enough and I am not qualified to enter the fifth and sixth floors of the library hall. However, I know that the fifth floor of the library hall stores the cultivation experience of the strong ones of soul Douluo and Title Douluo, while the sixth floor of the library Hall stores the skill of our Qibao Liuli sect. I''ll wait for you on the fourth floor of the library hall." While shaking his head with some regret, Ning Yuchen explained the books on the fifth and sixth floors of the library to Wang Kai.

"That''s troublesome, chen''er. I''ll be right back." then Wang Kai gently stroked the light pink hair in front of Fu Ning Yu''s head.

"Well, don''t worry, childe. Yutian will wait patiently for the childe on the fourth floor. Childe, don''t worry that Yutian will be anxious or angry!" with Ning Yutian''s quiet voice, Wang Kaixuan stepped into the light film and walked into the fifth floor of the library.

Compared with the books on the fourth floor of the library hall, the number of classics on the fifth floor of the library hall is undoubtedly less, about more than 1000. Of course, considering the rarity of soul Douluo and Title Douluo on Douluo mainland, the practice experience and understanding of laws of the strong with more than 1000 soul Douluo are actually very precious.

Naturally, every book on the fifth floor of the library hole is also precious. Any book can be sold at a high price of hundreds of thousands or even millions of gold soul coins. A thousand copies of the spiritual enlightenment of the strong people above the soul Douluo are a precious treasure that Tiandou empire can''t take out, and it is enough to show the strong heritage of the seven treasures Liuli sect. Ning Fengzhi can give Wang Kai permission to read these classics, which undoubtedly reflects his attention to Wang Kai.

Compared with the books on the fourth floor, the protection measures for the treasures on the fifth floor of the library hall are naturally more complete. Each book is placed in a special compartment, and there is a light film outside each compartment.

According to Ning Yuchen, Wang Kai placed the jade plate on a stone platform next to the partition. Suddenly, the jade plate in Wang Kai''s hand glowed slightly, and the light film of the partition corresponding to the stone platform dissipated slowly.

Wang KaiDun felt his hand sink slightly when he took out the classics in the compartment.

On the fifth floor of the library hall, all the classics are written on a special material called "iron paper". The tree pulp of Millennium iron wood is made by special technology. The weight of each piece of iron paper is 100 times that of ordinary paper, and the price is more than 1000 gold soul coins.

Of course, accordingly, iron paper is also a rare special material in Douluo mainland that can carry the cultivation rules realized by the strong ones of soul Douluo and Title Douluo. Not only that, it also has the magical characteristics of immortality for thousands of years. It is precisely because of these two characteristics that Qibao Liuli sect will use it to preserve the authentic works of these soul Douluo and Title Douluo.

Gently open the classics in his hand. This is actually the practice perception note of a strong man with Title Douluo level. While flipping through the classics in his hand, Wang Kai asked silently in his heart: "Xiaoguang, do you have the ability to scan the information of the classics directly through the light film?"