Three days later.

On a barren mountain in the south of the Gray Realm.

A black dragon with bloody flames soared into the sky and a blood-colored giant shadow transformed into a human form.

Where the two fight, various lightnings and thunderstorms, flames soar into the sky, mountains collapse, the earth collapses, and all the plants and even the land around them turn into desolation!

The scene can really be described as destruction of the world. Everything within a radius of millions of miles is destroyed, and the space continues to be turbulent and unstable!

The fierce battle did not last long, and in the end the blood-colored giant shadow was still ahead, releasing a vast blood blade, and hitting the black dragon seriously injuring.

"Your Excellency is amazing, I am willing to give in to the disadvantage!"

Even if the Black Dragon King, covered in scars, was unwilling to give in, he could only hold his fists and admit defeat in the face of absolute strength.

"I've given up."

The blood shadow turned into a young man, hugged the black dragon and clicked until it was time.

That young man is not Shen Lang.

Shen Lang spent three days to find the demon clan base in the southern part of the gray world, and aroused the demon emperor "Black Dragon King" who was in seclusion, and asked about how to enter Zixiao Palace.

The Black Dragon King felt that Shen Lang was very arrogant and fought with him in anger.

The results are obvious.

Even if the Black Dragon King, whose cultivation is at the peak of the Divine Source Realm, he is no match for Shen Lang, and he can only admit defeat in the end.

Shen Lang didn't want to make things worse and said seriously: "Shen did not mean to offend him when he came here, but I heard that fellow Taoists were studying ways to enter Zixiao Palace."

"It just so happened that Mr. Shen also wanted to visit Zixiao Palace, so he came to visit and discuss the matter."

"Maybe Shen can help fellow Taoist with help..."

Shen Lang smiled with a "kind" look on his face.

The Black Dragon King sweated on his forehead. He had seen Shen Lang's fierceness, so he dared not disobey the other party. He said repeatedly: "It's easy to say, so please ask fellow Taoist Shen to enter the hall of my demon clan to talk."

"Thank you." Shen Lang replied with his fists.

The Black Dragon King led Shen Lang to a giant city in the north of the barren mountain.

The city is the main city of the demon clan and the base camp of the demon clan forces. It covers an area of ​​more than one million miles and is surrounded by high gray city walls, emitting gray light, giving people a sense of solemnity.

There are a large number of demon monks patrolling everywhere inside and outside the city, and they are on high alert.

In the middle of the city, there is a monster palace made of black crystal stones. This is the palace that symbolizes the highest power of the demon clan and the palace hall of the Black Dragon King.

The Black Dragon King politely led Shen Lang into the hall and ordered the demon maid to bring the wine and spirit fruits to treat them well.

"I hope Fellow Daoist Shen will be very grateful for the many rude things before."

The Black Dragon King first apologized with his fists, and then asked tentatively: "I know all the strong people in the gray world, but I have never seen fellow Taoist Shen. I wonder where Fellow Shen practices?"

Shen Lang didn't hide it and said bluntly: "I am not a cultivator in this world, but from the True Immortal Realm."

"What! Are you a monk from the True Immortal Realm?!"

The Black Dragon King widened his eyes and almost jumped up in shock.

Shen Lang frowned and said, "What, are the monks in the True Immortal Realm very strange? As far as I know, the ancestors of your demon clan should also come from the True Immortal Realm."

The Black Dragon King explained: "Fellow Daoist Shen doesn't know that the entrance to the gray world has only been opened once in the disaster of the True Immortal Realm in the Hunyuan era. Since then, the entrance to the gray world has never been opened again and is completely isolated from the True Immortal Realm.

"The creatures entering the gray world are equivalent to being completely locked in the gray world and have no chance to return to the True Immortal Realm."

"It's true that the reason why I went into seclusion and studied how to enter Zixiao Palace was actually to find an interface channel to the True Immortal Realm in Zixiao Palace."

As an aboriginal native of the gray world who escaped from the True Immortal Realm in the Hunyuan era, the Black Dragon King now has strong enough strength and is thinking about returning to the True Immortal Realm.

After all, the resources in the gray world are limited, and the disadvantages of the rapid time flow, the Black Dragon King wants to go further in his cultivation, so he can only go back to the True Immortal Realm.

Speaking of this, the Black Dragon King couldn't help asking Shen Lang: "Dao you dare to ask how fellow Taoist Chen entered the gray world? If there is a way to go to the True Immortal Realm, there is no need for this emperor to deliberately study how to go to Zixiao Palace."

Shen Lang didn't want to reveal too much, and said, "Shen mistakenly entered the gray world by chance, and there was no way to go back in the original way. The reason why I wanted to enter the Zixiao Palace was afraid that the same as fellow Taoists, I wanted to find a way to leave the gray world."

When he heard this, the Black Dragon King sighed secretly.

"The things this emperor has studied are actually no secret. Since fellow Taoist Chen wants to know, let's show it to you."

The Black Dragon King took out several broken rubbings from the storage ring, moved them back and forth, pieced together a broken page and placed it in front of Shen Lang.

Shen Lang's eyes fell on the broken pages made of rubbings.

The remaining page seems to be a structural diagram of a certain formation, but it is still incomplete and almost half of it is missing.

"Huh? This formation seems to be..."

Shen Lang studied it for a while and suddenly realized that he had seen this formation somewhere.

"By the way, it's the Tongtian Formation!"

Shen Lang's eyes shone brightly and finally remembered it.

The formation of this remnant page, which I have seen in the virtual world, is the formation of the heaven.

At that time, the demon emperors in the virtual world used the pillar of light created by this formation to save the power of forbidden air in the virtual world and arrived at the Shenxiao Island in the dome of the virtual world.

Seeing this, the Black Dragon King couldn't help asking: "Does Fellow Daoist Chen know the mystery of this formation?"

"I have seen this formation with my own eyes. Although I have not personally participated in the arrangement, with the help of your formation residual page, the structure of this formation should be able to be completed!" Shen Lang said confidently.

At the beginning, Shen Lang did not participate in the arrangement of the Great Array of Heaven in the Void Realm. He just took a few glances and it was impossible to infer all the structures of the formation based on the impression in his mind.

Fortunately, the Black Dragon King happened to have the incomplete structural diagram of the Tongtian Array.

In addition to Shen Lang's inherent impression of the Tongtian Array, combined, it should be able to successfully arrange the Tongtian Array.

"That's great!"

The Black Dragon King was overjoyed. Unexpectedly, Shen Lang knew this formation, and this one was really in vain.

Shen Lang immediately tried to fill in the structural diagram of the incomplete part of the formation.

The Black Dragon King has been studying this great formation for more than 100,000 years. Looking at the structure diagram of the great formation that Shen Lang added stroke by stroke, many of the previous doubts suddenly became clear.

Based on the Black Dragon King's understanding of the Tongtian Array, he was sure that the structural diagram added by Shen Lang was correct.

Shen Lang recalled and studied it. After drawing for two days, he finally successfully completed the structural diagram of the incomplete formation.

"It's done!"

Looking at the structure diagram of the Tongtian Array completed by Shen Lang, the Black Dragon King was surprised and happy and complimented: "I didn't expect that Fellow Daoist Chen not only has great magical powers, but also a master of formations. With this formation structure diagram, we should be able to arrange the Tongtian Array smoothly and enter Zixiao Palace!"

Shen Lang poured a basin of cold water: "Don't be too happy too early. To activate this great formation of heaven, thousands of spirit gathering formations need to be built, and at least billions of tons of immortal stones are consumed as the activation energy."
Chapter completed!