Everyone was chatting quietly on the side, but this time everyone's topic was no longer about this formation, but looking forward to what treasures everyone could find below after opening the formation, or see what the sealed thing was.

Cheng Yu, on the other hand, sat in front of the formation alone and polished the spirit crystal, and he needed to constantly modify the spirit crystal according to the appearance of the empty groove. If it is polished properly, he will smile with satisfaction, and if it is not polished correctly, he will frown.

Several women see that every time there is a problem, Cheng Yu needs to solve it, and looking at Cheng Yu's focused, they will always feel very sorry for Cheng Yu in their hearts. But there is no way, the greater the ability, the greater the responsibility, which has always been the pride in their hearts.

Whether it is checking the formation or polishing the spirit crystal, it is a meticulous job, and there can be no sloppiness, otherwise it is very likely that the previous efforts will be wasted.

Sweat flowed down Cheng Yu's cheeks, and several women carefully wiped the sweat for him, their faces full of distress.

"Don't be in such a hurry, we can wait slowly!" Yao Na wiped her sweat for Cheng Yu and said gently.

"It's okay, this little thing can't be difficult for me!" Cheng Yu smiled at Yao Na and continued to polish the spirit crystal seriously.

After about three hours, Cheng Yu created a suitable spirit crystal according to the appearance of the empty tank.

"I'm not sure if this spirit crystal will work, I've worked hard to polish it according to the appearance of this empty slot, I hope it can be successful at one time!" Cheng Yu took the created spirit crystal and prepared to place it in the empty slot, and his heart was also nervous.

The others also looked at Cheng Yu's movements nervously, hoping that this spirit crystal, which had taken so long to build, would be able to successfully open this formation.

Click!

When Cheng Yu pressed the spirit crystal down, everyone obviously heard the sound of the spirit crystal stuck in the slot.

"This time it should be okay!" everyone felt their hearts beat to their throats.

However, it was disappointing that everyone waited for a while and did not see any other reaction.

"Failed?" said the crowd in frustration.

Even Cheng Yu showed extreme disappointment at this time, he took so much effort to polish such a piece of spirit crystal, but he didn't expect that the final result was still not a failure.

"It seems that it has indeed failed, it's been so long, and there hasn't been any reaction!" Xinhe shook his head and said helplessly.

"What can I do now? Is this a problem with the spirit crystals or something else? Could it be that the exit is really down there, and those guys took the two spirit crystals below when they went out?"

"Young Master, I think there's something wrong with your spirit crystal!" At this time, the black devil stood up and said.

"What do you say?" Cheng Yu said as he looked at the other party.

"Although this piece of spirit crystal of yours, young master, is polished according to this empty slot, the structure inside this empty slot is not ordinary, and it can be said that it is a little complicated. It's definitely easy to make mistakes if you polish it like this, I think young master, you should take off this piece of spirit crystal, and then copy one of this piece of spirit crystal to be more reliable!" said the black devil, pointing to the spirit crystal that was stuck in the slot.

"That's right, Senior Brother Yu, you might as well take off this piece of spirit crystal and polish it, you will definitely be able to do it!" Xinhai patted his thigh and said.

In the absence of any comparison, it is easy to make mistakes just by polishing it according to the shape of the groove.

"But if this piece of spirit crystal is taken off, this piece of spirit crystal will be useless, in case this slot is different from this slot here, then won't even this piece of spirit crystal be destroyed?" Cheng Yu said with some hesitation.

"If we can create the right spirit crystal from this spirit crystal, then even if this spirit crystal is no longer valid, we can make another copy, at most, it will be a waste of time and a spirit crystal!" said the black devil.

"Okay, then I'll take this piece of spirit crystal down and take a look, I hope these two slots are the same!" Cheng Yu thought about it, anyway, this piece was taken down, even if it failed, anyway, he could copy a piece of the spirit crystal exactly the same according to this piece.

In case you can't use it here, this original slot can still be used anyway.

Syllable!

Cheng Yu took off this spirit crystal at once, and obviously felt that the color of this spirit crystal turned white after it was taken off, and there was no longer the unique luster of the spirit crystal, which showed that this spirit crystal had indeed become invalid.

Then Cheng Yu took off the one he had polished before, and then carefully compared it with the two empty grooves, and suddenly his face showed surprise.

"Great, these two empty slots are really the same, now I just need to copy two pieces of this spirit crystal!" After seeing the result, Cheng Yu said happily.

"I'm scared to death, I'm really afraid that these two empty slots are different, otherwise I will have to waste a lot of time!" Seeing this result, everyone finally showed a smile in some nervousness and depression.

"Now that we have the template, we need to polish a few more spirit crystals to come out, in case there is no exit below, even if we get to the bottom, we need to use the spirit crystal again to open the formation to the top. Cheng Yu thought for a while and said.

"Well, in this case, let's help you polish a few spirit crystals together, it will be faster, anyway, there is already a template. Xinhe said.

"Young Master, we can also help you polish one!" said the Black Devil and the White Devil.

"Well, the four of us should be about the same as polishing the four spirit crystals, use two here, and leave two for backup below!" Cheng Yu nodded and said.

So, the four of them began to take the original spirit crystal and constantly compare and imitate it. Cheng Yu compared this original version with the spirit crystal he had polished before, and indeed found that he only had a lot less things compared to the spirit crystal polished by the empty groove.

Now that there is a template, the speed at which the four people build the spirit crystal is much faster than Cheng Yu's own exploration before, and the speed has at least doubled, but even so, it still took more than an hour for the four people to polish the spirit crystal.

"It's finally done, there should be no problem this time!" When all four of them were completed, looking at the four spirit crystals that were exactly the same as the template, everyone's confidence was greatly increased, and they believed that this time they would be able to successfully open this formation.

Cheng Yu first put one of the spirit crystals back into the slot where the spirit crystal originally had it, and there was no reaction to this spirit crystal except for hearing the sound of being stuck in the slot, because it was obvious that the formation from the bottom up was opened here, and there must be an empty slot below the connection to this formation.

And when Cheng Yu was about to insert another piece of spirit crystal into the slot and open the formation leading to the bottom, everyone became nervous again, and kept praying in their hearts, they had already spent too much time and energy here, and they couldn't fail again, otherwise they really didn't know what to do!

Syllable!

Cheng Yu inserted the spirit crystal into the empty slot again!