Everyone was blocked outside and couldn't enter, while Cheng Yu started to set up the formation inside alone.

Although there were only four runes in the Dayan Inheritance Cultivation Array, the formation was quite complicated, and Cheng Yu thought carefully about it before starting to do it.

Because the cultivators in this formation will absorb a large amount of spiritual energy when they break through, this formation itself can also gather spiritual energy, which is equivalent to the effect of a spiritual gathering array.

However, in order to be able to make this formation improve the realm for more people at the same time, Cheng Yu is also ready to arrange another Ancient Spirit Gathering Array to gather more spiritual energy.

The thirty-six peaks were originally a great array of locking spirits and gathering spirits, and Cheng Yu had arranged ancient gathering arrays everywhere on the fourteen peaks of the Cheng family a few months ago, so the aura of this Cheng family could be said to be very strong.

Now Cheng Yu is going to arrange a spirit gathering array on the Cheng family's cultivation tower, and he is going to place a spirit crystal in the eye of this ancient spirit gathering array.

These crystals appeared with Fire Feather when he was on the Misty Island in the Forest of Death, and he only used them to create a set of goddess ornaments for each of his women.

There were a total of seven spirit crystals in his hands, each of which was very huge, especially the large spirit crystal surrounded by six small spirit crystals in the middle, which was so huge that it almost stood there like a building.

Therefore, the six spirit crystals that were originally very huge seemed very small in front of it, but in fact, just such a small spirit crystal was already very large.

Cheng Yu was actually very curious about this, there were too many strange places in that holy city, and such a large spirit crystal was very rare even in the immortal world.

No, Cheng Yu didn't care if he thought about it, the Holy City had the resources of the world in its hands, and it shouldn't be a big deal to be able to have such a big spirit crystal!

Of course, Cheng Yu couldn't put those slightly smaller spirit crystals here as a whole to make the formation eye of the Ancient Spirit Gathering Array, but instead got a fist-sized piece of spirit crystal from above.

Don't look at this spirit crystal is only the size of a fist, but the aura contained in it can be described as massive, and the aura in this spirit crystal is very pure.

With such a piece of spirit crystal as the eye of the formation, even if this ninth layer was crowded with people, the aura contained in this spirit crystal was enough for them to break through together, and it was absolutely impossible for them to absorb the aura in it.

In addition, when no one usually comes in to cultivate, this Ancient Spirit Gathering Array constantly absorbs spiritual energy, and most of it will be absorbed by spirit crystals.

Only when someone comes to cultivate, this spirit crystal will release the spiritual energy, so that the spiritual energy contained in this spiritual crystal will never be exhausted.

Although the Ancient Spirit Gathering Array is nothing new to Cheng Yu, he still needs to spend some hands and feet to arrange such an improved and upgraded version of the Ancient Spirit Gathering Array.

Especially the value of this spirit crystal is huge, no matter who sees it, they will be greedy. Therefore, after Cheng Yu spent half a day arranging this Ancient Spirit Gathering Array, Cheng Yu began to arrange the Great Yan Inheritance Cultivation Array.

Compared to the Ancient Spirit Gathering Array, this Great Yan Inheritance Cultivation Array can be regarded as a truly top-notch formation. The person who can create such a magical formation is definitely a real formation stranger.

At least in Cheng Yu's opinion, except for the old man of the Heavenly Array, there is no formation master in the world who has such an ability.

So even if he already had the formation diagram, it was still quite difficult for Cheng Yu to arrange it, and it took more than ten days to arrange the formation.

"Masterpiece! This is a truly great masterpiece!" Cheng Yu said excitedly when he saw the formation he had completed.

The completion of this formation also marks that from now on, even if he is not in the Cheng family, the disciples of the Cheng family can use this formation to improve their realm and cultivation.

Although this seemed to reduce the dependence of the family disciples on him, he believed that his prestige in the Cheng family would definitely not decrease.

Because in order to hide the array eye spirit crystals of the Ancient Spirit Gathering Array, they also specially arranged several phantom arrays.

After the phantom array was arranged, Cheng Yu was very satisfied with everything he saw, because at this time, if they came in to take a look, they would definitely be surprised, wasn't this in the Immortal Demon Tower?

It turned out that Cheng Yu arranged the scene of the Immortal Demon Tower in the phantom array, so that no one who had been brought to the Immortal Demon Tower by Cheng Yu before to improve the realm would doubt the authenticity of this place.

Others didn't know that when he was here to help people improve their cultivation, he actually entered another dimension, so they would always think that they broke through here.

In this way, everyone will always think that from the beginning, their formation is the one arranged by their family master.

"Now that the formation has been completed, I don't know how the effect of this formation will compare to the effect of the cultivation array in the Immortal Demon Tower?" When everything was ready, Cheng Yu's only concern was the effect of this formation.

After all, this is also the first time he has arranged, although the formation has been completed, but after all, this is a counterfeit, and the effect can only be tried by someone!

So, Cheng Yu, who had something in his heart and had to wait immediately, rushed out directly.

But as soon as I went out, I was startled by the person in front of me!

"What are you doing here?" Seeing the group of people in front of him, Cheng Yu said speechlessly.

"Senior Brother Yu, have you finally come out, tell us, what the hell are you doing in there?" Xinhai looked inside curiously, but he didn't see anything strange, and he was very puzzled.

"What can I do, but you, don't tell me that you have been staying here since I came in?" Cheng Yu said angrily.

"Hehe, aren't we curious about what new stuff you've made up again!" Xinluo also smiled.

"That's going to disappoint you, I'm just meditating inside, what new things can I have!" Cheng Yu really has nothing to say to these people, and there is really no secret to do something by himself.

Fortunately, he had already greeted the guards, otherwise they wouldn't have discovered this little secret.

"You four, come in with us!" Cheng Yu looked at the four guards outside the door and said to them.

The four guards glanced at each other, not knowing what the head of the house was suddenly looking for him, but the head of the house had spoken, and although they were curious, they didn't dare to ask more, so they followed him directly inside.

"Alas, you just stay here and wait for us to come out!" Cheng Yu was about to close the door, but when he saw Xinluo and the others coming in, he directly blocked them.

"No, senior brother, even the disciples can go in, why can't those of us who are elders go in!" Xinluo said depressedly.