Yang Chengyun nodded, agreeing with Mu Hong's words, indeed, he had already thought about the time when they would enter the formation in the illusion, but he speculated that they actually entered the formation as soon as they entered the hall here.

But now it seems that the time for them to really enter the battle should be after the black fog appears.

After some exchange, Kou Sheng took out the unused wood-attribute sword from the storage bag and walked towards the center of the hall.

The hole in the center of the hall they had already discovered when they woke up, and it seemed that they had really passed the third level.

After Kou Sheng inserted the sword in his hand into the groove, an entrance appeared on one of the walls of the hall.

Without hesitation, everyone entered the passage that had just appeared in front of them, and they could only take one step at a time.

......

After Lin Bai entered the entrance that appeared in the hall, it took about half an hour to arrive at a room with several bookshelves, and in the center of the room was a quaint table with a jade plaque on it.

Lin Bai breathed a sigh of relief, wasn't it finally a test like the previous three levels.

The first three levels of the test were thrilling for him, and he almost died in the dream of the third level.

Little showed her head and looked curiously at the things in this room.

Just after Lin Bai entered this room, the lights in the room turned on, and Lin Bai found that the light source was a strange-looking lamp on the top of the room.

The light of that lamp was similar to that of the fluorescent tube in his previous life, but it was much brighter than the fluorescent tube.

The light on the top of the room illuminated the room as if it was day, and the sudden bright light made Lin Bai and Xiaoxiao uncomfortable, Lin Bai covered his eyes with his hands, and Xiaoxiao hid in his arms.

After getting used to the light here, Lin Bai walked forward and picked up the jade plaque on the table, it seemed that this should be a jade plaque used to record information, as long as the jade plaque was injected with true qi, the contents could be viewed.

There should be no danger on this jade plaque, and Lin Bai injected his true qi into it.

After Lin Bai injected true qi into the jade card, the jade card emitted a faint light, and then he felt as if something was stuffed in his mind.

After knowing that this was the information recorded on the jade plate, Lin Bai couldn't help but exclaim.

Xiaoxiao also became quite interested in this glowing jade plaque, scratched Lin Bai with his little paws, and asked:

"What is this?"

After digesting the information recorded in the jade plate, Lin Bai told Xiaoxiao what was recorded in it:

"There are 1,000 basic books in the secret room, master the content of the book, use the materials in the other ten secret rooms to arrange the ten formations, and then pass the level. ”

"Formation, what is that?" asked after hearing Lin Bai's words, scratching his head slightly.

Being asked by Xiaoxiao, Lin Bai didn't know how to answer, he really didn't know what the formation in this world was, and the formations he had learned in his previous life were mostly those things that arranged the characteristics of multiple things together, and later achieved a certain purpose.

For example, a feng shui array or something is to put a specific item in a specific position.

Faced with a small problem, Lin Bai had no choice but to shrug his shoulders and say that he didn't know.

Judging from the content in the jade card, Lin Bai basically determined that this was a formation path inheritance, which couldn't help but make him interested, the formation path was a little interesting.

According to the jade plaque, master the contents of these books in the secret room, and then arrange ten formations to pass the level.

He originally thought that the end would be after those three levels, but he didn't expect that there would be a test after that.

According to the jade tablet, there are a thousand books in the secret room where he is, which makes him feel a little numb, a whole thousand volumes, how much time does it take him to master them all?

And it also said that the materials in the ten secret rooms are used, where are the ten secret rooms?

Lin Bai glanced at the entire room and found that there was a small door behind the bookshelf, was that small door the one leading to the ten secret rooms?

He walked towards the small door, and after pushing open the small door, there was a passage, which also had a lamp for lighting, and there were ten more doors in the passage, and these ten doors should be the ten secret rooms mentioned on the jade tablet.

Lin Bai pushed open the door of one of the rooms and found that the space inside was much larger than the room in front of him, almost half the size of the previous hall.

Soon he saw where the jade plaque was, and to the left after he entered the room, there was a table and a shelf, on which was a jade plaque, and on the shelf were various materials that he did not recognize.

After stepping forward and activating the jade plaque on the table, Lin Bai learned that the materials in this secret room were used to arrange a formation called the Locking Spirit Array, and the jade plaque only said that these materials were used to arrange the Locking Spirit Array, and the rest of the information was not introduced.

Just as Lin Bai was about to go to the next room, he suddenly saw these small lights emanating from the wall next to him.

After he stepped forward to check, he found that the bright light turned out to be glowing words, and those glowing words were: A, B, and C.

And there is also a zero word under A, B and C, and the word B is bigger, Lin Bai can't help but think, could it be that there are two other people besides him who have reached this level?

The jade plaque in the room said that ten formations needed to be arranged, but now I haven't arranged any of them, is this what this zero represents?

And the one with a larger font size must represent yourself.

Lin Bai frowned, there were obviously five stone doors in that hall, but now there were only A, B, and C No. 3 on it.

He suddenly remembered that the sect's teleportation jade plate was invalid here, and he knew the danger of the previous two levels, did that mean that the people who entered the remaining two gates had already been...

......

Lin Bai then went to check the other nine rooms, and found that the rest of the rooms were all similar to the first one, all of them were a jade plate with a table on it, and the jade card recorded the formation that needed to be arranged, as well as a shelf full of materials, and the words on the wall were the same as the first room.

During the process, Xiaoxiao has been very quiet, revealing her little head from time to time Lin Bai's clothes, and looking at everything around her curiously.

After looking at all ten rooms, Lin Bai returned to the room full of books.

Looking at so many books in front of him, he couldn't help but have a headache, he really mastered all the contents of the books and didn't know how long it would take him, if he couldn't arrange those ten formations, would he have to be trapped here all the time? ?

He couldn't help but be a little worried in his heart, originally he entered the secret realm just to find the few spirit grasses he needed, but he didn't expect things to develop step by step to this point.

......