As the head of the family, of course, the head of the Cao family is unwilling to bow to Tang Yin in front of everyone, it will be too much of a loss of his identity, and it will also affect his image and prestige.

The problem is that he has no choice now, if he doesn't bow his head, he will immediately usher in a fatal throwing knife, a flying knife that can shoot Cao Zhenghao.

Cao Zhenghao is a grandmaster-level powerhouse, and he is still inevitably seriously injured by flying knives.

He is much worse than Cao Zhenghao, if Tang Yin really wants to kill him, he will definitely die with a knife.

Between bowing his head and dying, he must make a choice, and he chooses to bow his head and admit his cowardice and get through the difficulties in front of him for the time being.

"Go on!" Tang Yin smiled.

"Our Cao family is willing to compensate you 500 million, do you think it's okay?" The head of the Cao family said worriedly, the second-rate family is not very rich, and it is also very heartbreaking for him to take out 500 million at one time.

It will even affect the operation of the family business to a certain extent, but he must take it out to tide over the immediate difficulties.

"Your Cao family is the heir of the trick?" Tang Yin pointed to the two puppets that were stopped by him, and it took a very advanced trick to make a puppet that could be used in battle.

"The ancestors of the Cao family are the descendants of the mechanism technique, but now no one has mastered the technology of making mechanism puppets, these two are the only ones left, and they have a history of thousands of years!"

"I want all the cheats of your Cao family, especially about the tricks!" Tang Yin nodded, he also saw that the two puppets were also two old antiques.

Even when it was running, there were already some inflexibility, and it was obvious that the daily maintenance of the puppet was not good, so that it affected the performance.

From this point, it can be inferred that even if the Cao family has the cheats of the trick, no one can be proficient in it, otherwise it will not be possible to do even simple maintenance.

"Okay!" Of course, the head of the family didn't want to agree, but he received a message from Cao Zhenghao, asking him to agree to Tang Yin's request, and even lead Tang Yin into the family secret vault.

What's the situation?

The head of the family was immediately stunned, the family secret vault is the life, root and son of the family, there are not only the secret books passed down from generation to generation by the family, but also many precious resources of the family, what if Tang Yin takes a fancy to it?

The current Cao family, no one can stop Tang Yin.

Nedan!

As soon as the doubts in his heart rose, he heard Cao Zhenghao say two more words, and his eyes immediately lit up and he understood.

If you eat too much good food, you will die!

"The family's cheats are placed in the secret vault, which is the small building opposite the dungeon!" After the head of the family understood Cao Zhenghao's meaning, he immediately took the initiative to say.

"Count your acquaintances and remove all your people!" Tang Yin waved his hand and ordered.

The head of the Cao family was also very cooperative, and immediately dismissed the gathered family members, and even the people Tang Yin rescued from the dungeon were released, leaving only three people from the Zhou family, who would leave with Tang Yin after a while.

"You guys take a rest first, I have something to deal with with the head of the Cao family, or you can leave first if you're in a hurry!" Tang Yin looked at the three of the Zhou family.

"We're waiting for you to go together!" Zhou Huihong said immediately.

Tang Yin nodded, and under the leadership of the head of the Cao family, he walked step by step towards the Cao family's secret vault and activated the mechanism of the secret vault.

From the outside, the vault is just an ordinary building, and there is nothing special about it compared to other buildings, but the special things start when you enter the door.

First of all, the first gate, is a heavy stone gate with a thickness of half a meter, I am afraid that it weighs tens of thousands of catties, and it can only be opened by relying on a mechanism.

After entering the door, there is a long corridor, according to the introduction of the Cao family, this corridor is 100 meters long, there are a total of thirteen organs, and all kinds of vicious killing techniques are nothing

Not included.

Then you actually enter the vault, which is a large hall with three portals around it, each representing a corresponding category.

First of all, entering the portal representing the cheats, there are dozens of books of all kinds, most of which are about the tricks, Tang Yin packed them all at once, and the face of the head of the Cao family who watched it twitched vigorously.

Finally, I came to the second portal, which contained some cultivation resources, and there was no shortage of various kinds of precious medicinal materials.

"What's in here?" After entering the second portal, Tang Yin found that there was a shelf in the middle, and a jade box was placed on the shelf, and the square jade box was a foot long.

Such a large jade box, made of the finest jade, and a real antique, was handed down from the Tang Dynasty, and was certainly not just an ornament.

"This ......" the head of the Cao family showed a very tangled look.

Seeing his tangled look, Tang Yin knew that there must be a heavy treasure in the jade box, and the head of the Cao family didn't want him to see it, for fear that he would take it for himself.

The question is that it's already such a time, how can Tang Yin let it go so easily?

"Say!"

"It's a Neidan!"

"Nedan?" Tang Yin didn't expect such an answer.

Neidan is a very powerful demon that can only be bred, it is the condensation product of the essence and strength of the demon, even if the dragon flower cultivated by Tang Yin is not qualified to form it for the time being.

The demons that can give birth to Neidan are usually very strong, even if there are ten or eight grandmasters to besiege them, they are just going to deliver food, how did the Cao family get it?

"Yes!"

"How do you have Nedan?"

"It was obtained by the second elder of Taishang by chance, he found an old-timer's cave mansion, Neidan is the collection of old-timers, and after the second elder Taishang inadvertently contacted Neidan, he was directly promoted to grandmaster. The head of the Cao family looked at Tang Yin and said.

Tang Yin asked the head of the family to open the jade box, and sure enough, he saw a milky white sphere inside, about the size of a tennis ball.

"The loss is too serious, I'm afraid that only about one-tenth of the essence and strength are left!" As soon as he saw Neidan inside, the white tiger who came with Tang Yin was a little excited.

But there is a contractual relationship between him and Tang Yin, no matter how excited he is, he can't act without Tang Yin's permission.

"Don't be impatient!" Tang Yin ordered the white tiger.

Stretching out his hand, Tang Yin grabbed Neidan.

Airplanes!

As soon as he grabbed Nedan, Tang Yin felt a trance, and then heard a huge roar full of violence, and the whole person was motionless.

"Great, see if you die this time?" Seeing Tang Yin's motionless appearance, seeing the changing expression on Tang Yin's face, the head of the Cao family was happy.

He drew a sword and stabbed Tang Yin into the neck.

Bite!

A golden iron roar, a brilliant lotus.

"What's going on?" The head of the family was taken aback, he thought that a sword would kill Tang Yin, but he didn't expect that he couldn't stab it at all, as if Tang Yin was not flesh and blood, but hit by King Kong.

The head of the Cao family did not believe in evil, pushed the sword in his hand, and assassinated Tang Yin up and down, after twenty or thirty swords, he heard a snap, the sword in his hand was broken, but Tang Yin was not damaged at all.

"How can his physical body be so strong? Although my sword is not a divine weapon, it is also a rare master!" The mentality of the head of the Cao family collapsed a little.

Someone else stood motionless and let him take the sword and slash at will, but he broke the sword, but the person he wanted to kill didn't even break a little skin, which is not logical.

"Family master, have you already killed people?" Cao Zhenghao walked in from outside.

"No, yet

Nope!"

"Why haven't you killed it yet?" Cao Zhenghao frowned, he had always been in contact with the head of the family, and the head of the house sent him a signal to tell him that Tang Yin had been tricked, so he walked in.

The strategy of him and the head of the family was very simple, that is, to let Tang Yin know about Nedan, and even take the initiative to touch Nedan.

Because the Nedan brought back by Cao Zhenghao is very unusual.

Cao Zhenghao also wanted to help the family create more strong people because Neidan became a grandmaster, and after bringing it back to the family, he also wanted to help the family create more strong people, so he selected some elite children at home and let them use Neidan to improve their strength.

Unexpectedly, it caused a disaster, but all the children of the family who came into contact with Nedan basically had problems, and there were a total of ten family children who came into contact.

Seven exploded, and the whole person exploded to pieces.

The remaining three didn't explode, and their strength increased greatly, but their spirit went wrong, and they all became crazy and had to be imprisoned.

The head of the family and Cao Zhenghao realized that there was something wrong with Neidan, so they no longer used it for the children of the family, but locked it in the family's secret vault.

Tang Yin was so powerful that they couldn't kill them at all, and they didn't want to come up with a huge amount of compensation, so they suddenly thought of a way to let Tang Yin contact the problematic Neidan.

If Tang Yin has a problem, their problem will be solved.

"You can't kill it!" said the head of the Cao family helplessly.

"How can you not kill you?" Cao Zhenghao seemed very incomprehensible about the words of the head of the family, isn't it simple to kill people?

A knife is stabbed in, pulled out, and the person hangs up.

"The knife can't be stabbed at all!"

"Can't get in?" Cao Zhenghao came not far from Tang Yin, and saw that Tang Yin's forehead was bruised, and he behaved the same as when the children of the Cao family used Neidan.

He immediately breathed a sigh of relief, in this state, Sugar Smoke had no ability to resist, so he could only be slaughtered.

He took a knife from the side and slashed at Tang Yin's neck.

Choke!

The sparks were brilliant, and Tang Yin was not damaged at all, but the machete in his hand had a gap, and the knife collapsed

"What a powerful body!" Cao Zhenghao immediately understood, it turned out that Tang Yin had a powerful body in addition to his powerful flying knife technique.

Ordinary swords are difficult to damage, and I am afraid that they need a divine weapon to kill, but the problem is that their Cao family does not have a divine weapon.

"Damn, it would be nice if I wasn't injured, as long as I had more than sixty percent of my strength, I could kill him with my bare hands!" Cao Zhenghao's face was very ugly.

"What a great opportunity, you actually failed to seize it!" Just as the head of the Cao family and Cao Zhenghao were thinking of a way, Tang Yin's eyes suddenly opened, and his expression returned to normal.

"You, you're all right?" the two Cao family were taken aback.

"I'm fine, you two have something to do!" A hint of murderous intent flashed in Tang Yin's eyes, he was dead just now.

When he first came into contact with Neidan, he was attacked by the demon spirit that remained on Neidan, and he lost control of his body for a while.

Fortunately, it was only a remnant of the demon soul, and its strength was insufficient, and one ten-thousandth of it was quickly defeated by Tang Yin and dispersed.

After the demon soul was dispersed, the remaining demon soul essence was absorbed by Tang Yin, allowing Tang Yin's soul to further strengthen, although it did not bring Tang Yin a direct increase in strength, but it made his soul further stable and his spiritual power further strengthened.

When Tang Yin fought with the demon spirit, although he didn't react to the outside world, it didn't mean that he didn't know what was going on.

Tang Yin knew everything that the Cao family and the two did, but they were fighting against the demon soul at the time, so they couldn't be distracted.

"Give me a reason not to kill you!" Tang Yin sneered, looking at the two people who were so frightened that their faces turned pale, Sen Leng's murderous intent was undisguised.