Cheng Yu thought about it again and again, but still put away the two bottles of poison. However, although he can't use these two bottles of poison to find an antidote now, he has other things to do.

Heaven and Earth Yin and Yang Ancient Returning Heaven Formation, during this time, he would come here to cultivate this formation as long as he had time.

Now, this formation Cheng Yu has almost studied, and now it is the last step to practice.

This formation is of great significance to Cheng Yu, as long as he succeeds, he believes that this world will change because of him, and even be able to change the situation of the dynasty's dominance!

I saw Cheng Yu take out a white bone from his storage space, looking at this white bone, Cheng Yu's face showed a look of excitement.

He first put this white bone into the formation of this layer, and then began to activate the formation according to the formation he had studied during this time.

Although Cheng Yu now feels that he has learned this formation, it is the first time to practice and the first time to open this formation.

Therefore, Cheng Yu is still very nervous, and he doesn't know if he can succeed this time. However, even if it doesn't work out this time, he believes it will succeed in the future.

It's just that although I think so in my heart, I still hope that I can succeed this time.

After the formation was opened, ninety-nine eighty-one runes of various colors flew out of the tower wall, and then hung in it in a certain pattern above the formation map.

First of all, the formation on the ground began to emit ninety-nine-eighty-one rays of light, which happened to correspond to the ninety-nine-eighty-one runes hanging above, opening into ninety-nine-eighty-one beams.

At this time, Cheng Yu excitedly found that the white bones in the formation had reacted, only to see that the white bones that were originally lying on the ground slowly hung up in the air.

The formation on the ground began to change, and the runes on it also changed, and these rays of light continued to swim on the white bones.

Cheng Yu's heart was nervous and excited, this is a good start, judging from the current situation, everything is normal with this formation. If this continues, then there shouldn't be any problems.

But think about it, I just learned how to run this formation, and the other parts are all ready-made. As long as you accurately mobilize the eighty-one runes required by this formation, and then activate this formation correctly, it stands to reason that there will be no other problems.

However, it is not an easy task to successfully "resurrect" this white bone, at least not something that can be completed quickly.

Therefore, three days have passed, Cheng Yu is still sitting on the eighth floor of the Immortal Demon Tower, and the formation is still very balanced and constantly changing.

The first change seems to have some unknown mysterious power entering the white bone.

However, although Cheng Yu was not in a hurry at all, those people outside were already impatient.

"Senior Brother Yu, what's going on? Didn't you say to go and see Wushuang? Why it's been three days, and I haven't seen a human figure?" Xinluo said anxiously.

Now don't look at their lives in this mountain and river map, but in reality, they are trapped in the giant peak mountain in the Tianyang Domain.

If they can't go out for a day, they can't rest assured for a day.

But Cheng Yu suddenly disappeared, which made people a little depressed and anxious.

"Wushuang said that he left three days ago, and now that his cave is barranged, he should have something important!" Yang Ruoxue said.

"Could it be that Senior Brother Yu is in retreat again?" Xinhai said suspiciously.

"It's not like he's going to advance again, is it?" Xinluo guessed.

"Probably not, he's only been advancing for a few months, shouldn't it be so fast?" everyone shook their heads, the last time Cheng Yu advanced was on the way back from the Forest of Death.

It's only been half a year now, and in such a short period of time, Cheng Yu shouldn't be able to advance right away, right?

"It's hard to say, with Senior Brother Yu's madness, in the Forest of Death, he broke through twice in a row in a few months. It's been half a year, so it shouldn't be a problem to break through once, right?" Xinluo was envious of Cheng Yu's two consecutive breakthroughs.

After all, for normal cultivators, breaking through once is an unavoidable thing, and many people must cultivate for tens or hundreds of years to reach the limit of breakthrough.

But Cheng Yu doesn't seem to have this limitation, and he can easily break through, which is really enviable!

"If only this were the case, his current strength would be comparable to that of the late Mahayana stage, and if he advanced to another level, wouldn't it surpass the late Mahayana stage? If that's the case, maybe we will be able to leave this ghost place!" said Xinhai with a smile.

"Don't speculate here, won't everything be clear when he comes out?" Xinyun said.

"Alas, this kid is really, he doesn't say hello in advance if he wants to retreat. What's more, at this critical moment, he retreated so silently, isn't this going to kill us in a hurry?"

"Okay, don't complain, the more Cheng Yu chooses to retreat at such a critical moment, the more important it is for him. Let's just stay here, anyway, there is food and drink here, what are you anxious about? It's better than staying in such a hot place outside!" Xinmei said.

"That's right, but I don't know how long his retreat will last? It's been three days, and he hasn't reacted at all. If he is going to be closed for a year and a half, what will the frost-free girl do?" said Xinluo.

"Do you think Cheng Yu will be a fool? Even you can think of this, he can't think of it?" Xinmei said angrily.

"Alright!" Xinluo quickly covered his mouth, lest he say the wrong thing again.

Everyone was waiting anxiously outside, but Cheng Yu was still calm. After three days of waiting, he had long since lost the freshness and excitement he had just started.

Looking at the formation that was still changing, and the white bones that were constantly moving in the formation, his heart was looking forward to it!

However, as time passed, when it was the fifth day, Cheng Yu became excited again. Because he found that the white bone had begun to change.

I saw that the original white bones were lying flat and hanging in the formation, but now, this white bone was already sitting in the formation just like them.

Moreover, there seemed to be something more in his eye sockets, which were no longer as empty as before.

However, Cheng Yu knew that this formation had not ended so soon, so he could only be patient and wait slowly.

It wasn't until the eighth day that the formation finally stopped. And what made Cheng Yu even more excited was that this white bone was no longer sitting in it, but standing straight in the formation!

"It's done! My experiment was successful!" Cheng Yu said excitedly as he looked at the white bones.

Sou!

However, at this time, Cheng Yu didn't have time to see the specific situation of this white bone, only to see that after this formation disappeared, this white bone actually rushed towards him quickly!