A book lay quietly on the desk.

Yun Feng looked at it in a daze, not opening.

The more he moved forward on the path of cultivation, the more Yunfeng found himself ignorant. The passage of the undead, the evil spirits, the catastrophe of fifteen years ago, the lonely hell, there are familiar, there are unfamiliar, and there are unheard of, the Underworld is like a silkworm chrysalis, which needs to be peeled off layer by layer to see the essence inside.

The world is so big, but I haven't yet perceived it, and it would be false to say that I am not frustrated. Chen Ming and Shen Jiuli were already far ahead of him, and Xinnu, a walker from an unknown land, didn't know when he would be able to catch up with him.

Heart slave, this law name makes Yunfeng elusive. He didn't know the real name of the heart slave, and the name was just a sign.

We know a person not because of his name, but because of a certain quality he displays. Lively, introverted, humorous, wise, cunning, different personalities are embodied in different people, giving us all kinds of impressions, and in order to distinguish them, we use a symbolic sign.

And when the symbol is removed, he is still him, just as the reason why Zhang San is "Zhang San" is a kind of character and morality represented by his body, when Zhang San is changed to Li Si, our impression of him will not change, "Li Si" or "Zhang San." ”

Yunfeng believes that if you want to be the ultimate in one thing, you must either become holy or become a slave.

Sanctification is great, but it is easier said than done. This does not mean that a saint has no shortcomings and has not made mistakes, but having a noble character, governing the world, or far-reaching merits is the prerequisite for becoming a saint.

It is also not easy to become a slave. The word "slave" may sound disdainful and humble, but it is a very high realm. To be called a "slave", you must indulge in it, be single-minded, do whatever it takes, and even go crazy, so that it is possible to reach the ultimate in the end. Not everyone can be distracted, devote themselves to one thing, and forget themselves completely.

A slave of the heart, literally, is a slave to the heart. At first, Yun Feng felt that people should control their hearts, and becoming the master of the heart is the highest and farthest realm, rather than becoming a slave of the heart and being controlled by it. But if you think about it, who of us is not a slave of the heart, and everything we say and do, every move, and everything we do is based on our hearts and are driven by our hearts. Sometimes we may do things against our will, but against our will, we make decisions that are made by our hearts. For example, we don't like flattery and slapping horses, but we have to do it because of accidents, but no matter how reluctant you are, the moment you do it, it is from your heart.

Yun Feng thought to himself, when people can get rid of the "heart slave", it may be the legendary heartless realm.

The library was silent, the windows were open and the moonlight was shining in from under the walls. He didn't light the lamp, and he could read the words on the book clearly by the moonlight, but at this time he was not in the mood to read, just looked at the bright moon in a daze.

Gradually, the scenery on the moon became clearer, and once he only saw a gray outline, imagining the beauty of it through legends. Sometimes, too, he thought he had seen the woods, the palaces, and the dancing fairies, but it was only an illusion.

But at this time, the gray outline became more and more clear, and a pattern with regular lines slowly appeared, and the clouds and wind felt that the moon had never approached before.

Yun Feng finally saw clearly, it was a fierce beast that he had never seen before, with eight legs and four eyes, a long and sharp triangle, a monstrous aura, and a hideous face.

Suddenly, he jumped down from the moon and rushed towards the clouds, his evil eyes making him unable to move his steps, and he opened his bloody mouth to show his fangs and went straight to his neck.

"Hoo ......"

Yun Feng woke up in a cold sweat. The window was indeed open, the pages rustled in the breeze, and he looked up, the moon was as bright as a dream, but the beast was gone.

Lighting the lamp and candle, Yun Feng walked back and forth between the bookshelves, occasionally looking at the drawings in his hand, hoping to find the third part of the library.

Still nothing.

According to the design structure of the combination of the book pavilion and the cliff, as well as the visual inspection of the cloud wind and the field survey, there is no extra space on the outside of the building, and if there is a secret room, it should be in the depths of the cliff. But this is full of bookshelves, but I am afraid that the entrance is set up extremely hidden, even if Yunfeng uses violent elimination to remove all the bookshelves, he may not be able to find them.

He didn't have this idea because he didn't have confidence in the black gold list, but because he wanted to improve his strength faster. In the previous battle with the Black Devil, he thought that he had the power to protect himself, but Puth's overwhelming power shattered all his dignity, and he could only leave like a dog with his tail between his legs in the sympathetic eyes of everyone.

Requiem Sacrifice, the appearance of the Heart Slave made him understand that there are still many unknowable places in the Netherworld Continent, many unknowable people, they are the most dazzling darlings of this world, and they are destined to become the existence of all people.

Yunfeng doesn't want to live under the protection of others, he can be a dog for a while, but one day he will stand in front of Puth and tear his sanctimonious disguise to shreds. dignity, he will pick it up himself.

The ugly time has passed, and Yun Feng has no clue, blows out the lights and candles, and leaves.

The moonlight shone on the quiet bookshelves, dappled like frost.

"What is this?"

Yunfeng stopped.

A ray of moonlight shines through the small hole between the carved railings on the bookshelf on the inner wall, and although the lamp and candle are extinguished, you can still see things by relying on the moonlight, and this light is mixed in it, and it is impossible to find it if you don't have excellent eyesight.

Yunfeng walked over to the bookshelf and pulled out a book along the light of the hole.

On the yellowed cover, the three words "or the first classic" have been faded, and Yun Feng flipped through the preface, and the version of the seventh year of the era was not abnormal.

This scripture is an authoritative collection of records of all kinds of strange beasts in the Netherworld Continent, and the selected ones are all powerful beasts, some of which are now extinct. Yunfeng was familiar with this scripture when he was young, and he memorized it backwards. The fierce beast that appeared in the previous dream was something he had never seen before, and some of its characteristics were like one of the ancient beasts described in the book, Dijiang.

Just hurriedly turned the page, Yunfeng didn't look closely. He spread his palm straight, inserted it into the gap where the "or Shoujing" was originally placed, and slid it up and down, and sure enough, he found that there was a gap in the shape of a mouth on the back baffle......

Yunfeng held his breath and concentrated, pressed it lightly, and then pulled out his palm.

"Boom!" With a muffled sound rippling in the study, the two bookshelves slowly moved away, and the deep stone door was like the bloody mouth of a fierce beast, waiting for the prey to throw itself into the net.

Yunfeng picked up the lamp and candle at hand and entered the stone gate.

Descending the stone steps, there was soon no way out, and a stone wall stood in front of him. The cloud beast on the wall walked, and the skills were exquisite, but the cloud wind's eyes were tightly locked on the copper lock in the wall. He had seen this ancient lock in an ancient book and was very impressed.

"Nine Sons Linked to the Lock......"

The faint candlelight swayed softly with the clouds and wind.

......

......

"Is it the most difficult ancient lock in history?" On the desk, there are all kinds of rulers, messy papers are everywhere, books are piled up like a hill, and a head is buried in the mountain, not who Yunfeng is.

I saw him holding a ruler in one hand and a gong pen in the other, drawing one stroke at a time, extremely serious and focused. Soon, a precise composition is on the page.

"Still not right. "This time, no matter how similar the figures seem, there is always a difference in feeling, not in the composition, but in artistic conception, a subtle judgment in the senses.

This time-consuming drawing, along with dozens of previous compositions, finally fell into a messy ball of paper on the ground. Yunfeng has a habit of nibbling on the pen when thinking, and at this time this peach wood pen is only a stub.

"It's so full. At a loss, Yunfeng had to stop and rethink. It's been three days, and there's not been any progress. The Nine Sons Alliance, one of the most difficult to crack ancient locks in history, is not in vain.

It's time to re-examine his train of thought, and Yun Feng takes his gaze away from the paper. For the past two days, he has been weaving through the shelves, collecting books about ancient locks. To his surprise, although the Nine Sons Lianfang Lock was ancient, it was not small, and there was no shortage of records in the rich book pavilion.

"There are so many variations, and there are endless mysteries. This is the praise of it in the Book of Lu.

This ancient lock was used for the building structure at the beginning, similar to the mortise and tenon joint, tightly fitted, fit each other, and did not cost a nail or a hook. The simplest is the cross structure, which is simple and strong for the load-bearing of the building, and is easy to install and disassemble. From simple to complex, in order of "six tenons", "seven star knots", "eight buckles", the most complex, that is, nine sub-lianfang. It is composed of nine-sided columns to form a cube, concave and convex occlusion, intricate, up to 100 assembly methods. The nine-sub-square lock that evolved from this is the most different from the commonly used locks in that its lock has no holes, and naturally there is no key. The way to crack it is to disassemble it and peel off the cocoon, but its assembly order is varied, and there are hundreds of combinations, like a labyrinth that cannot be turned back, and every exit must be found first, so as not to fall into a dead end. The key point is to find the thread in order to deduce the order in which it is built.

The reason why Yunfeng didn't try it in turn was because he was worried that after the unlock failed, some kind of mechanism might be triggered or other unpredictable things might happen, and the safest way was to succeed once. Looking at the sketches everywhere, Yun Feng changed his thinking, no longer stuck to the composition, and began to build the model. Instead of composing a picture a thousand times, it's better to do it all over again.

Armed with enough sticks and necessary tools, plus a few steamed buns and some water, he entered the tunnel again.

It is not difficult to build a model, playing Xiaoyunfeng has a strong interest in handicraft, disassembling the wheelchair at the age of seven and unable to put it back for half a month, designing and making a semi-automatic mechanical leg to assist walking at the age of ten, the gear jammed and fell into the ditch, and was found by the servant a day later. Although he has suffered repeated setbacks, he has really cultivated his hands-on ability.

The ancient locks embedded in the stone wall are made of copper, which have been mottled and dark due to oxidation for a long time, and have been sealed in the dust for many years in the years when they have not seen the light of day.

The model was quickly built, although it was the same type of nine sub-couplets, but the assembly methods were different, and the order of building the ancient locks in the wall could not be found, and Yunfeng had no way to start. The ancient lock sequence diagram is like a "key". Without it, the chances of a successful disassembly are negligible.

Prior to this, Yun Feng had also tried to find the sequence map, but after searching for a few possible places to hide the map and finding nothing, he gave up. Not to mention whether the sequence diagram is hidden in the book pavilion, even if it is, the possibility of finding it in the sea of thousands of books is very small.

Staring at the ancient lock in the wall, Yun Feng racked his brains, it was easy for a person to get sleepy if he concentrated on thinking for a long time, so he fell asleep.

When a person is asleep, the brain does not stop functioning, but simply keeps the body functioning in a low-energy state, like a hibernating cold-blooded animal. When you are asleep, the sensory connection with the outside world is not interrupted, for example, when you are cold, you are like falling into an ice cellar in your dreams, and when the fire source is close to your body, you often feel like you are in a sea of fire in your dreams. Therefore, those who are alert can sense the approach of danger even when they are asleep, and those who are aware of the laws of heaven and earth and those who are close to nature have more sensitive senses.

In the dream, drawings depicting ancient locks kept flashing in front of Yun Feng's eyes, rotating around him, and the small models kept changing, fitting and decomposing in different ways.

"I'm such a genius. Yunfeng woke up and praised himself sincerely, thinking that he had found a way to crack it.

"East, west, north, south, center, plus northeast, northwest, southeast, southwest, southwest, and southwest, just by nine bucket arches will be the weight of the library on the column. ”

And each bucket arch is the same as the nine sub-square locks. As long as the order of the nine bucket arches is clear, and then assembled in order, it is the wall in the ancient lock sequence diagram. Yun Feng wandered in the sea of books, and soon found the architectural atlas of the book pavilion.

From his first day as a librarian, he learned about the history of the Book Pavilion. This book pavilion was built in 9466 BC, which has a history of more than 10,000 years. Although it has been rebuilt three times and repaired successively, there has been no major change except for the widening of the space and the replacement of rotten wood, and the original appearance has been preserved to the greatest extent.

At the beginning of the construction of the book pavilion, the hollow place was actually supported by nine stone pillars, striving to carry the concept of eternity. However, after a major earthquake, the stone pillars cracked, the pavilion partially collapsed, and after dredging and reconstruction, the contemporary dean decided to replace the stone pillars with wood to increase the flexible space and absorb the earthquake to the greatest extent.

Yunfeng took the architectural atlas, climbed the column in turn to compare the structure of the dougong, simplified the complexity, combined the nine arches into one, recorded them in the book and noted the order of assembly.

Wissing the beads of sweat from his forehead, Yunfeng entered the dark passage again. There is no need to follow the diagram, the sequence diagram of the ancient locks has been engraved in my mind. Like caressing a woman's smooth skin, Yunfeng gently dismantled the peripheral copper strips one by one. Since the first copper bar fell off the mottled pillar, carrying with it the dust particles that had been attached for a long time, the heart of the cloud and wind had been reined in on the cliff.

As the copper bar was disassembled in an orderly manner, the verification of his heartbeat was so quiet that he could hear it clearly, stimulating the center of his brain, but he tried his best to suppress it, and his hand was surprisingly steady.

In the joy and anxiety, the ancient lock is about to be disassembled, and the mysterious and unknown expectation will finally be realized, and only the last copper bar remains.

"Hum~" Yun Feng only felt a buzz pass through his ear canal and rushed directly into his brain. All of a sudden, a complicated picture poured into the optic nerves.

A monstrous amount of blood gushed out of the hole, drowning him, and a violent pressure seeped into the pores, invading the blood, like a big hand grabbing a beating heart, and the next second he shook it lightly, and the flesh and blood burst apart.

Everything was so real, Yun Feng looked at the stone wall, saw his frightened face like a mirror, and seemed to see through the barrier to see another world.

The unknown finally overcame fear, Yun Feng found that the sweat in his palm was dripping down his fingertips, and the hand holding the copper bar seemed to be disobedient and somewhat resistant to the instructions of the brain. In the struggle between body and consciousness, the last copper bar is withdrawn.

With a slight tremor, the stone wall opened in a way that Yunfeng could not imagine.