Qin Lang did not rush to enter this underground imperial city, but carefully observed the layout of the underground imperial city, although this underground imperial city was only half the size of the above-ground imperial city, but according to Qin Lang's estimate, the resources it consumed were probably greater!

The walls of this underground imperial city are all made of fine copper, this kind of fine copper is a material that can be used to forge magic weapons, and its value is already quite expensive, not to mention that the city wall is also engraved with countless formation runes, and countless spars are inlaid in the middle of the runes.

In the human world or other black iron worlds or even the bronze world, I am afraid that such a building cannot be found, because it requires huge wealth and strength as a foundation to build such an underground imperial city.

Any kind of building that can be called a wonder of the world contains the wealth and corpses of countless lower-class people. Although this underground imperial city in the Demon God Realm is magnificent, I don't know how many civilians in the Demon God Realm or creatures in the colonial world are buried in it.

"Sir, why don't you just go in?" Princess Demon Moon couldn't help but ask Qin Lang.

"Of course, you have to go in, but now is not the time. Qin Lang said calmly, "I don't know how long this underground palace has been stored, but no matter how long it is, the royal family of the Demon God Realm must know about its storage, but why does the royal family of the Demon God Realm have no intention of opening this underground palace at all?"

Qin Lang has always been very cautious, especially in the other world that he is not familiar with, although the underground imperial city of the Demon God Realm in front of him seems to be buried with countless wealth and cultivation resources, and it seems that it is easy to get it, but reason tells Qin Lang that things are not so simple.

Although the royal family of the Demon God Realm was defeated by Qin Lang and the army of the Half-Demon Realm in a hurry, they still had time to use the resources of this underground imperial city, but what was the reason for them to ignore the existence of this underground imperial city?

Qin Lang couldn't guess the reason, but he was sure that the reason must not be simple, so Qin Lang didn't rush into this underground imperial city, but called Jiang Tian out and asked him to calculate the formations around this imperial city.

Qin Lang also has a considerable understanding of all kinds of cultivation formations, it is based on this understanding that Qin Lang is sure that the formations around this underground palace are not simple, these formations are not only to isolate outsiders from the induction of the underground imperial city, but also have other uses, if Qin Lang carefully studies for a while, he should be able to study some eyebrows, but now with Jiang Tiansuan, Qin Lang can combine its innate yin and yang gossip techniques, this innate yin and yang gossip can not only calculate good luck and evil, but also other things, such as the mystery of the formation。

What is the formation?

In fact, the formation is the number of spells, the earliest formation, in fact, is from the Yin and Yang Taiji, innate gossip, the more complex the formation, the more rigorous, so the formation has four elephants, five elements, six combinations, seven stars, eight trigrams, nine palaces, etc., in fact, these are the number of spells, since it is a number of spells, then you can return to the source through guò calculation, and finally see through the secret.

It's like any complex math problem that can be solved with a simple formula.

Although the large array established by the monk is complicated, as long as the basic principles of the formation are clarified and a certain foundation is established, then all that remains is the talent and patience of the heavens to "solve the problem", Qin Lang's comprehension talent for the formation has always been good, as long as he is given enough time, he can also unlock the secrets of these formations. However, now that there is Jiang Tiansuan, Qin Lang can save a lot of time in calculation, Jiang Tiansuan's name "Tiansuan" is not for nothing, this guy deduces the formation and calculates the good and the bad, which is quite awesome, so Qin Lang naturally handed over this task to Jiang Tiansuan, which is also to save time.

Jiang Tiansuan really didn't disappoint Qin Lang, in less than half an hour, it had already figured out the principle of the formation on the wall of the underground imperial city, Qin Lang got some information from Jiang Tiansuan, and was about to take action, but sensed that an outsider was approaching here.

So, Qin Lang involved the Fire Spirit Snow Fox and the others into the Temple of the Undead, and he himself got into it, completely hiding his own aura, just quietly waiting for the other party to appear.

Qin Lang's induction was naturally not wrong, and after a while, someone broke through the earth and quickly approached this underground imperial city. Soon, the guys were in front of the main entrance of the Imperial City.

"It's a member of the royal family of the Demon God Realm - the leader is the Nine Emperor Princes, named Jiuying, he is one of the strongest princes of the Demon God Realm royal family, and it is very likely to become the heir of the Demon Emperor of the Demon God Realm. Coming here with it is the royal family's offering, and these guys are very strong!" After Princess Demon Moon and Qin Lang merged into the two realms, as long as Qin Lang was willing, she could naturally see the situation in the outside world through Qin Lang's senses.

The Temple of the Dead completely concealed Qin Lang's aura, no matter how powerful the opponent was, as long as Qin Lang didn't act rashly, it would be impossible for the other party to detect Qin Lang's existence.

Qin Lang didn't plan to act rashly, because through Jiang Tian's calculations before, Qin Lang knew that the formation on the wall of this underground imperial city was not to prevent outsiders from entering, but a strange seal-seal, of course, to prevent the things inside from coming out!

It's no wonder that when the imperial city was captured in the first place, the royal family of the Demon God Realm did not use this underground palace, probably because they were also afraid;

If they didn't take the last step, no one would want to take the risk lightly, and now that the royal family of the Demon God Realm had come to the end, they naturally didn't mind taking the risk.

Since the people of the royal family of the Demon God Realm are going to enter this underground palace, Qin Lang is not in a hurry to make a move, just as the so-called praying mantis catches cicadas and yellow finches are behind, if these people want to take the lead, Qin Lang doesn't mind.

However, the Nine Emperor Princes acted very steadily, and this guy did not rush into the underground imperial city, but first let his people search the surroundings to confirm whether there was anything abnormal around.

The subordinates brought by Jiuying are also very powerful, after all, they are the worship of the royal family, and soon they noticed that someone had come here before, and one of the guys also judged that it should be a demon beast here, as if it smelled the residual demonic energy.

Qin Lang had to secretly scream, when he entered here, he let the fierce beast that drilled into the ground destroy the tunnel, he didn't expect that this Nine Emperor Prince, Jiuying's subordinates, could detect it so quickly, but that guy didn't notice Qin Lang's existence.