"The mouth of the vein is a spiritual eye of the ghost vein of the great river."

"This great river ghost vein stretches for hundreds of thousands of miles in the entire Boundless Sea, and countless demonic and spiritual powers are gathered in it, but it is quite complex."

"The demon kings jointly established the Hunyuan Palace, which is to refine the ghost veins of the great river everywhere and practice Yao Jing, this thing is more suitable for the cultivation of the demon clan than the spirit stone, and the Taoist friends can exchange the treasure for the demon crystal."

I see.

Zhang Xiaohan nodded, the inheritance of the ancestors did mention that the D demon power was extremely pure and collected, that is, it could produce demon crystals.

This thing is extremely difficult to find in the outside world, because the outside world is already the world of the human race, the demon race is weak, and even the demon beasts are extremely difficult to find.

Not to mention being able to produce demon crystals.

It is said that in ancient times, some extremely powerful demons walked where they were demon crystals, and the demonic power they exuded alone could condense demon crystals.

And in some immortal ancient battlefields, where the great demon fell, it is also possible to produce demon crystals.

This demon crystal is extremely suitable for the cultivation of the demon clan.

It's even better than the Terran spirit stone.

After all, spirit stones need to be absorbed into the human body and transformed into spiritual power, and in the same way transformed into demonic power.

And the demon crystal is pure, and if it is absorbed into something that does not mix with the slightest impurity, it is pure demon power.

Even if it is not used for cultivation, it can be used for battle, or to maintain the demon array, which can be said to be very useful.

"Take a look at it, and I'll look for you if you need it." Zhang Xiaohan said.

The Bei Yuren nodded, and then said, "Thank you, fellow Daoists, please feel free." ”

Zhang Xiaohan went deep into the Hunyuan Palace.

Just described.

Zhang Xiaohan felt a bit of strange art.

This Hunyuan Hall was only established for a few hundred years.

Compared with the history of tens of millions of years in this true secret realm, it is almost in the blink of an eye.

Could it be that every demon city in this demon city is also built on this Hunyuan Palace?

After all, the Hunyuan Hall was established by relying on the veins. Could it be that every demon city is just above the vein!

You must know that according to this description, the ghost veins of the big river are extremely mottled.

How could this mottled demonic power build a city?

This is extremely detrimental to the cultivation of the demon clan.

There is only one possibility.

These demon cities were probably only established after the establishment of the Hunyuan Palace.

In the Hunyuan Palace, there are all kinds of demon clans, all kinds of colors.

are all redeeming Yao Jing at various windows.

And that's just the first layer.

After taking a look, this Hunyuan Hall has seven floors.

The first layer is the exchange of demon crystals, and it is also the largest layer.

The second layer is the trading layer, where the exchanged demon crystals can buy various items, which are also opened by the Hunyuan Palace and used to rent to other demon clans.

The third and fourth floors are the chiefs of the Hunyuan Palace, who exchange medicinal materials and magic weapons.

Zhang Xiaohan on the fifth floor did not have the permission to enter, and according to some inquiries, the fifth layer was a place used by the Hunyuan Hall to entertain distinguished guests, and it was generally used to exchange for a large amount of demon crystals.

If you don't have the qualifications, you won't be able to set foot at all.

As for the sixth layer, it is the place where the hall master of each Hunyuan Hall is located, and at the same time, the hall master of Hunyuan Hall is also the city lord of the Demon City!

Zhang Xiaohan was shocked in his heart.

It really confirms what I just thought.

The demon city is built on the Hunyuan Palace!

The hall master of Hunyuan Hall is the city lord!

As for the seventh layer, no one knows what it is.

Zhang Xiaohan didn't have much demand for demon crystals.

However, some magic weapons are extremely needed.

He gave the seven-star sword to Yao Yun before, and since then, there has been no more competent swordsman.

And the swordsman is on the fourth layer, and he also needs to exchange spirit stones or demon crystals.

But Zhang Xiaohan didn't have a spirit stone, so he could only exchange for demon crystals.

Zhang Xiaohan came to a window, and on the opposite side was an octopus who was in charge of the exchange, and his strength was actually at the sixth level of the Demon Realm.

Zhang Xiaohan took out three pills.

"One second-grade painting soul pill, and two first-grade reggae pills." After the octopus got the three pills, what surprised Zhang Xiaohan was that he was extremely skillful in pronouncing the names and grades of the three pills.

"Fifty-three demon crystals."

Fifty-three demon crystals are roughly equivalent to fifty-three spirit stones.

However, for the demon clan, the value of the spirit stone is still inferior to that of the demon crystal.

In the Boundless Sea, fifty-three demon crystals are enough to compare, hundreds of spirit stones.

Experienced and knowledgeable!

The demon clan in each window is not simple.

But think about it, day after day, Neitian faces thousands of demon beasts to exchange for demon crystals, and he doesn't have the eyesight to see how he can do this job well.

However, fifty-three demon crystals is not a lot.

The exchange for spirit stones is at least one hundred.

This is equivalent to the cargo on the back of a whale demon.

Zhang Xiaohan put the space ring on the magic circle in the window a little, and soon fifty-three demon crystals were in the account.

"Do you still have any?" The octopus is also a lot of human feelings, and seeing that Zhang Xiaohan has no intention of leaving, he knows that he still has pills on him.

Zhang Xiaohan nodded by default.

"Fifty-three demon crystals are already extraordinary in an ordinary first-floor window."

"If you can take out hundreds of demon crystal pills, you can guarantee that you can enter the VIP room on the fifth floor."

Hundreds of ......

The corners of Zhang Xiaohan's mouth lifted and he took out a pill.

"Five-grade Xuanhe Dan!" With just one glance, the octopus came out silently, and the eyes that looked at Zhang Xiaohan became respectful, as if he was seeing a treasure.

The five-grade Xuanhe Pill is made from the crown feather of the Ten Thousand Crane King and a series of heavenly and earthly treasures. Although the materials are quite simple compared to other five-rank pills, the difficulty of refining them is to go straight to the six-rank pills!

When it reaches the fifth grade, it is called the Xuanhe Pill, and if you take it, you can temporarily transform the breath of the Ten Thousand Crane King into the form of the Ten Thousand Crane King.

It has the realm of the demon king, the king of ten thousand cranes, and the law of three incense sticks.

Be able to fight with ordinary first-order demon king powerhouses!

How could he not recognize this pill.

Round Value...... I'm afraid it's worth thousands of demon crystals!

It is equivalent to creating a Jindan realm powerhouse! What are a thousand demon crystals?

These things are lifesavers.

This is refined by Zhang Xiaohan in his spare time, and he simply did not reach the sixth grade, otherwise, I am afraid that he will attract Dan Lei.

It is also because he is now deep in the demon world, this Xuanhe Pill has almost no role in the human world, even the Jindan powerhouse can't withstand such a huge demon power, not to mention the will of the Ten Thousand Crane King.

But for the demon clan, there are few drawbacks, and it can be called a life-saving magic weapon!

A demon king exists.

It is equivalent to being the leader of the hundred secession forces in the entire Boundless Sea.

If you can have the first-order strength of the demon king for a short time, even an ordinary demon king will not be willing to provoke easily!

"Is it enough to go up?" Zhang Xiaohan said.

"Please, please."

The octopus hurriedly pressed the circle and said a few obscure demon words.

It was a commotion among the demons of the Hunyuan Palace.

A team of demon clan powerhouses walked in front of Zhang Xiaohan quite domineeringly.