There is an additional sand house dozens of kilometers away from the ancient desert city, which covers an area of about 20 square meters, and the appearance is not very beautiful, obviously the owner of the sand house does not pay much attention to these.

Outside the sand house, Cheng Kai was on guard, and inside the sand house, Lin Fan was holding a desert puppet core spar, and his powerful divine thoughts probed into the core spar, carefully studying the puppet formation inside the core spar.

Suddenly, with a snap, the core spar in Lin Fan's hand shattered.

"It's broken again!" Lin Fan muttered, and suddenly shouted at Cheng Kai outside the sand house: "Cheng Kai, you go into the desert ancient city and get me ten core crystals of first-level to third-level desert puppets!"

Cheng Kai, who was outside the sand house, responded after hearing Lin Fan's words, and then flashed into the desert ancient city, and got Lin Fan the core spar he needed according to Lin Fan's request.

Five days have passed since Lin Fan broke through the desert ancient city once and then exited, and in these five days, Lin Fan did not enter the ancient city again, but built a sand house near the desert ancient city and began to study the puppet formation inside the desert puppet core spar.

The wounds on Cheng Kai's body were also healed two days ago, and since then, he has been working as a guard outside the sand house, or according to Lin Fan's instructions, he went to the desert ancient city to get the core spar that Lin Fan needed.

Cheng Kai's strength is the Three Tribulations Scattered Immortals, if he only obtains the core spar of the desert puppet instead of breaking into the palace, such strength is definitely at ease.

In the past five days, there has also been a Four Tribulation Scattered Immortal of the Fire Yuan Sect who found this desert ancient city, and also found Lin Fan and Cheng Kai, who originally planned to kill Lin Fan and Cheng Kai and take the treasure.

However, after Lin Fan released the Immortal Beast One-Horned Red Lin Beast, the Four Tribulations Scattered Immortal of the Fire Yuan Sect immediately fled and turned around and entered the desert ancient city.

At first, Lin Fan still heard the sound of the Fire Yuan Sect Scattered Immortal fighting with the desert puppet, but the sound of the battle quickly disappeared. After that, Lin Fan never saw the Fire Yuan Sect's scattered immortal leave the desert ancient city.

Cheng Kai's speed was very fast, and he returned from the desert ancient city in a short time, and at the same time, he also brought back the core spar of the desert puppet that Lin Fan needed.

"Master Taizu, what do you want these core crystals for?" Cheng Kai finally couldn't help but ask with doubts in his heart.

"I'm studying the puppet formation inside this core spar, and I have a hunch that this puppet formation may be the key to our ability to enter the central palace!" Lin Fan said.

"I see!" Cheng Kai suddenly said, "Master Taizu, I'm not very proficient in formation, and I can't help you, I'd better go outside to protect your safety, Master Taizu! I will definitely get it back for you, Master Taizu!"

"I will temporarily retreat for a period of time, and during this time, I will trouble you to protect the Dharma for me!" Lin Fan said.

"Master Taizu, please rest assured, I will definitely protect Master Taizu you!" Cheng Kai promised, and then went outside the sand house to protect Lin Fan.

"It is very difficult to use the knowledge of the formation of the cultivation realm to crack the puppet formation in this core spar, and this puppet formation should be the formation of the immortal realm. It is tens of millions of times more complicated than the formation of the cultivation realm. It seems that if you want to figure out this puppet formation, you have to learn the formation of the fairy world!"

Lin Fan didn't immediately start re-researching the core spar. Instead, he raised his hand to create a prohibition to isolate himself from the outside world. Then he entered the Wanbao Immortal Mansion, planning to go to the Library Tower to learn the Immortal Realm Formation.

However, after entering the Wanbao Immortal Mansion, Lin Fan did not immediately go to the library tower, but came to a secret room. Helena is in retreat in this secret room, and there is no sign of awakening, but Helena's strength has improved with time. Not long ago, I actually broke through to the Mahayana realm without crossing the Heavenly Tribulation!

Seeing that Helena still hadn't woken up, Lin Fan left the secret room and came to the library tower. At this time, Lin Fan's strength had already broken through to the realm of immortals, and all floors in the library tower could be entered.

Coming to the sixth floor of the library tower, there are very few bookshelves on this level. There are a total of tens of thousands of jade slips on the bookshelf, and these jade slips are recorded in the formations of the fairy world. In order to quickly figure out the puppet formation inside the core spar in the desert puppet's body, Lin Fan had already begun to study the formation of the puppet in the immortal formation.

Lin Fan divided half of his mind to check the information in the jade slip in the library pavilion, and the other half of his mind entered the Hongmeng Hall and used time acceleration to quickly comprehend the formation. After Lin Fan's strength broke through to the immortal realm, the time acceleration of Hongmeng Hall also increased from a hundred times to a thousand times!

The biggest benefit of increasing the time acceleration to a thousand times is that Lin Fan has more time to comprehend the formation!

Time passed slowly, and in the blink of an eye, a month had passed in the outside world.

A month is not a long time, but it is not a short time. But in the case of a thousand-fold acceleration of time in the Hongmeng Palace, a month's time is equivalent to more than eighty years in the outside world.

After more than eighty years of comprehension, Lin Fan also had a certain understanding of the immortal realm formation, and he also had some confidence in comprehending the puppet formation in the core spar in the desert puppet's body.

Leaving a trace of his mind to continue to comprehend the immortal realm formation in the Hongmeng Palace, Lin Fan left the Wanbao Immortal Mansion and appeared in the sand house.

As soon as Lin Fan came out of the sand house, more than a dozen figures appeared in front of Lin Fan. One of these dozen or so figures was Cheng Kai, and the other dozen or so people were also among the many scattered immortals of the sect who went to the tomb of the Immortal Emperor this time.

"Master Taizu, you're out of the customs!" Cheng Kai said.

"Master Taizu!"

"Master Taizu!"

The other dozen or so sect scattered immortals shouted respectfully when they saw Lin Fan.

Lin Fan nodded slightly, looked at Cheng Kai, and said, "Cheng Kai, tell me what happened during my month of retreat?"

"Yes, Master Taizu!" Cheng Kai replied, and then told Lin Fan about what had happened in the past month.

In the space of a month, more and more cultivators who were sent to this endless desert discovered this desert ancient city, and more than a dozen scattered immortals of the Ten Thousand Treasure Sect found this place.

Those cultivators immediately began to break into the ancient city after discovering that there were treasures hidden in the palace in the ancient city, but soon those low-level treasures in the first area could not satisfy their desires, and began to break into the second and third regions, many cultivators who lacked strength, but because of excessive greed, went to the deeper areas of the ancient city to break into the deeper areas of the ancient city, and were finally besieged to death by the desert puppets!

And in the course of a month, a crucial thing happened, and that was about the way to leave the Endless Desert.

More than ten days ago, a native cultivator of the Immortal Tomb Continent whose strength was equivalent to the Second Tribulation was wandering through the first area of the ancient city and accidentally entered a palace. There are no treasures in this palace, but there is a teleportation array out of the endless desert!

The discovery of the teleportation array immediately excited those cultivators who were eager to leave the Endless Desert, because it meant that they could finally leave this damn desert!

However, the teleportation array disappeared at the same time as it teleported the cultivator away, and even if people searched the entire palace, they couldn't find it.

Although no teleportation array was found in this palace, it is believed that there should not be only one teleportation array, and there will definitely be teleportation arrays in other palaces as well!

However, the thousands of palaces in the first area have been searched and have not found any palaces that contain the teleportation array, and many cultivators can't help but wonder if there is only one teleportation array, and after using it, there is no more?

Since there is a teleportation array in the first area, there should also be a teleportation array in the second area and the deeper area!

Many cultivators had placed their hopes in the second area and other areas that went deeper into the ancient city.

Sure enough, after two days of searching, the teleportation array was finally found in a palace in the second area, which disappeared after teleporting the two away.

The disappearance of the teleportation array again made the cultivators feel a burst of despair, the teleportation array in the first area disappeared after teleporting one person away, and the teleportation array in the second area also disappeared after teleporting two people away, does that mean that three people in the teleportation array in the third area teleported three people? If so, then only a few people can leave this desert!

However, an incident that happened a few days ago once again ignited the hope of leaving the hearts of many cultivators, and the teleportation array that was left by someone in the first area occurred again, and only one day after the teleportation array in the first area was discovered, the teleportation array was also found again in the second area.

It's just that this newly found teleportation array is not in the original palace, but appears in other palaces that have been determined to have no teleportation array!

Based on these teleportation arrays that disappeared and reappeared, people have concluded a few things:

First, the teleportation array does not disappear permanently, but will reappear after a certain period of time, but the location of the reappearance is not in the original palace;

Second, the teleportation array in each area will reappear differently, for example, the teleportation array in the first area will reappear after nine days apart, while the second area will be eight days, the third area will be seven days, and so on;

Third, the number of people who can be teleported in different areas is different, the teleportation array in the first area can only teleport one person, while the second area is two, the third area is three, and so on.

"Teleportation Array?" Lin Fan was slightly stunned, and soon sneered, after knowing that there was a teleportation array in every area that could leave the Endless Desert, Lin Fan knew that he had drilled the horns of the bull!

Thinking about it, if it is true that only the palace in the center of the ancient city has a way to leave the Endless Desert, then it is certain that the people who have entered the Endless Desert can leave except for those immortals with golden immortal-level strength who can leave, won't the rest of the people be trapped here forever?

Therefore, there must be other ways for the weak to leave, and this way is the teleportation array......!