Wu Yan only now realized how wise it was to copy the "Book of Medicine" in the first place. The antidote pill that the pharmacist Feng gave him was an antidote pill that could cure all kinds of poisons, and it was clearly a very vicious "God Devouring Gu".

There is a very detailed description of this Gu in the "Medicine Sutra". This is a kind of poisonous Gu that can control people's hearts. This Gu was sealed inside a pill refined from several mixed herbs. Those who take this Gu will have the painful feeling of devouring the soul of ten thousand insects at first. This feeling will only last for a short time.

After the pill is consumed, this Gu will break through the first layer of sealed pills, sneak into the human mind in the human body, and then release some Gu poison that adheres to the human mind. Once this Gu adheres successfully, it will enter a state of deep sleep, unless the person who is under the Gu, the mother Gu, begins to devour the soul of the person in the Gu, otherwise the Zi Gu that enters the person's mind will not wake up.

Once the person in the Gu does not listen to the words of the person who is in the Gu, the person in the Gu will accuse the mother Gu of devouring the soul of the person in the Gu, and the soul of the person in the Gu will be devoured by the Gu and become a walking corpse, subject to the control of the person in the Gu.

The thought of having such a creepy thing sleeping in his head made Wu Yan feel a chill down his spine. This pharmacist's heart is also too vicious.

Originally, Wu Yan also planned that no matter what the pharmacist asked him to do, he would do it seriously, and even listen to him completely, practice the fourth layer of the nameless mantra, and help him regain the one that belonged to him according to his instructions.

But when he learned that the pharmacist Feng actually used such a vicious "God Devouring Gu" against him in an attempt to completely control himself, Wu Yan's heart was not only cold, but also thinking more about how to become stronger, how to expel the "God Devouring Gu" from his brain, and get rid of the control of the pharmacist Feng.

The rivers and lakes are sinister, and the hearts of the people are sinister, so that they are like this!

However, what made Wu Yan crazy was that according to the records of the "Book of Medicine", this kind of "God Devouring Gu" seemed to be unable to be expelled by itself at all. Unless the Medicine Sealing Master can give him the Mother Gu in his hand and let him use the Mother Gu to force the Zi Gu to come out of his nostrils on its own.

But would the pharmacist do that? The answer is clearly no. If he is willing, why should he bewitch him?

He treats himself like this, and does not hesitate to spend a lot of financial and material resources to let him cultivate the nameless mantra, is it really to let himself live longer?

Now, it doesn't seem like that's the case. He must have had even more terrible intentions for himself. Thinking of all the scenes where he had been in contact with Pharmacist Feng so far, thinking of Pharmacist Feng's strange eyes every time he looked at him, Wu Yan suddenly realized that Pharmacist Feng seemed to want something from him that scared him.

The pharmacist must have also noticed that he had entered his study to look through his books. He cultivated the matter of the "Fengyun Sword Spectrum", and the pharmacist must know it. It's just that Pharmacist Feng is not sure if Wu Yan has read other books.

Perhaps, in his opinion, since Wu Yan is so interested in martial arts, he must be the first to peek at "Fengyun Sword Spectrum", as for the other books, maybe Pharmacist Feng guessed that Wu Yan didn't have time to read it at all.

In order to prevent Wu Yan from discovering that he was not taking an antidote pill, but was given a "God Devouring Gu", the pharmacist Feng put away the "Medicine Sutra". As for why he put away the "Hidden Killing Technique" and "Puppet Fragments", Wu Yan guessed that these two secret techniques were either related to the strange energy flow that he was cultivating now.

Thinking of this, Wu Yan became excited.

At the moment, since he couldn't get rid of the "God Devouring Gu", he could only use the time when the pharmacist left to desperately improve his self-protection ability. I hope that when the two turn their faces in the future, he will be able to grasp more of the capital for self-protection. Now, this breakthrough is in the "Hidden Killing Technique" and "Puppet Fragments".

Wu Yan hurriedly returned to his stone house and found these two books. In order to prevent someone from breaking into the valley and discovering his secret, he packed all his belongings and quietly took them to the Yunhai Cave hidden in the hundred-foot-high waterfall.

Sitting in the Yunhai Cave, Wu Yancai stroked his chest and let out a sigh. In fact, he was also too worried. Chikusa Valley was originally a forbidden place for the disciples of the Iron Sword Alliance. Except for the two medicine farmers who were in charge of taking care of the medicine garden in the valley all the year round, the others did not dare to break in without the permission of the pharmacist.

In the Iron Sword Alliance, everyone knows that the pharmacist has a strange temper, and he has arranged a large number of colorless and tasteless poisonous barriers at the mouth of the valley where he lives. Without the poison avoidance pill given by the pharmacist, no one dared to break in lightly.

Wu Yan sat in the Yunhai Cave and carefully looked at the two books "The Art of Hidden Killing" and "Puppet Fragments" in his hand. Two days later, Wu Yan's face turned strange.

The whole book of "The Art of Hidden Killing" is about how to use various objective conditions such as light, terrain, and environment to hide and kill people in an invisible assassination technique.

This kind of assassination technique is also a peculiar hidden killing technique that does not require internal force and can be achieved purely by relying on the body and various natural conditions. The entire assassination technique, according to the different situations encountered in different environments, lists dozens of subtle kung fu that need to be cultivated.

If you want to practice this "Hidden Killing Technique", it will take several years to practice just a few basic skills. And that's just the basics. In order to achieve a more advanced hidden killing effect, there are still many subtle and profound kung fu that have to be practiced one by one.

At the end of the book, it is said that there are three conditions that must be met to practice this hidden killing technique.

First, a cultivator must possess the five senses that are beyond ordinary people, that is to say, cultivators must far surpass ordinary people in terms of hearing and vision, so that they can have any hope of attaining cultivation. Second, cultivators must also have perseverance, wisdom, and understanding that far surpass ordinary people. Third, it is best for a cultivator to have a special physique, it doesn't matter whether there is internal strength or not, but there must be a special physique. This special physique is a bit strange to say, it requires cultivators not only to have super physical strength and endurance, but also to have extremely flexible toughness.

It is based on these three requirements that this led to the "Hidden Killing Technique", although the effect of assassination after practice is amazingly good, but throughout the ages, there are very few people who can really practice.

I really don't know where the medicine man got such a strange book. However, looking at the situation of the pharmacist, it seems that he has not learned much about this hidden killing technique.

Wu Yan remembered that the last time he went down the mountain, the superficial disguise techniques used by the pharmacist were simplified versions of the hidden form kung fu in this hidden killing technique. Compared to the real Concealment Technique, this Transfiguration Technique is only a superficial and superficial aspect of the Technique.

After reading it, Wu Yan pondered for a long time and decided to start increasing the subjects of cultivation every day in the future. From now on, in order to increase the power of self-preservation, he will cultivate this hidden killing technique.