Successfully promoted the realm from the Intermediate Sage to the Great Sage.

Zhu Hengyu can finally breathe a sigh of relief.

Next, what Zhu Hengyu had to do was to build a fortress of chaos with profound veins as the core!

The Chaos Fortress is similar to the existence of the Ten Thousand Demon Mountain.

Only with profound veins as the core of energy can a fortress that can stay in the sea of ​​chaos be built.

Because there is only one profound vein...

It is impossible for Zhu Hengyu to build a fortress, a city, or a super dojo like Wanmo Mountain.

However, if it is just to build a fortress, the problem is not big.

After making a decision...

Zhu Hengyu walked away and left the world of Xuantian.

Next, Zhu Hengyu rushed to the underground city for the first time.

To build a fortress of chaos, a huge amount of hardware is needed.

If you want to get enough hardware, you must go back to the dungeon and enter the ancient city of Purgatory.

Three days later...

Zhu Hengyu returned to the ancient city of Purgatory and entered the underground storage space.

Looking around, the area in the underground storage area that had been emptied is now piled up with metal mountains.

These metal mountains were all mined and smelted by Chuanshan craftsmen during the past period of time.

Till now, 36 million elite craftsmen of the Chuanshan tribe and 72 mining teams are mining all kinds of ores day and night.

Unfortunately……

If you want to refine the Chaos Fortress, you need the top materials.

These ordinary five-element metals cannot be used to build Chaos Fortress.

Fortunately, there are enough metal materials in the legacy left by the Demon Ancestor.

Although the rarity of these metal materials is not comparable to Chaos Fine Gold and Chaos Spirit Jade.

But what you need to know is that Chaos Adamantite is actually not suitable for building Chaos Fortress.

Metal has never been the best material for building buildings.

There are three types of materials that are most suitable for construction, namely-soil, wood, and stone!

Among them, soil can be used to build earthen houses.

Or burn the soil into bricks and tiles to build houses.

However, both soil and bricks are only suitable for low-rise buildings.

Moreover, the strength of the building is still very low.

As for wood...

Houses made of wood are beautiful, but wood is easily eroded by wind, frost, rain and snow.

Prone to cracks, decay, and even insects.

Moreover, the strength of wooden houses is not even as strong as that of mud and brick buildings.

What is really suitable for building buildings is stone.

You can use stones directly to build a castle.

It is even possible to burn stone into cement and pour it into reinforced concrete together with steel.

Its strength and hardness are exaggerated.

Not only the mundane world...

The spiritual world is actually the same.

It is not soil and wood that are really suitable for building Chaos Fortress, but stone!

Of course, the stone here is not bluestone, or ordinary stone such as granite.

The stone here refers to the colorful stone!

Colorful stones are the congenital five-element stones that were scattered when the world opened up!

Its number is very rare.

Every colorful stone is invaluable.

The Chaos Fortress made from colorful stones is the strongest!

Zhu Hengyu didn't know where to find the colorful stones.

But fortunately, the Demon Ancestor and the Mother Earth God, in the battle of destruction, left a colorful stone mountain for Zhu Hengyu!

These colorful stones were originally used by the Demon Ancestor and Mother Earth God to build the Ten Thousand Demon Mountain.

However, the Ten Thousand Demon Mountain was formed by condensing three thousand profound veins, and it was huge in size.

The Demon Ancestor and the Mother Earth could not find so many colorful stones.

In desperation, the Demon Ancestor and Mother Earth had to abandon the colorful stones.

Directly use three thousand profound veins to condense into the main body of Wanmo Mountain.

As for the colorful stones collected, Zhu Hengyu is cheaper.

Although the amount of colorful stones collected is too small, it is definitely enough to build a fortress of chaos.

Speeding all the way...

Zhu Hengyu quickly found the pile of colorful stones exuding colorful light.

Most people want to come.

The so-called colorful stones must have five colors.

In fact, the colorful stones are black.

To be more precise, it is a black gem with multicolored light.

If you ignore the colorful light, it is no different from coal.

However, when you really see the colorful stone, no one can ignore the colorful light.

Zhu Hengyu put away the pile of colorful stones.

Approximately estimated, these colorful stones, there are about 30 million pieces.

Each piece has the size of an adult fist.

So many colorful stones are enough to build a fortress.

Any acquired metal, once it is taken away from the Sea of ​​Chaos, it will inevitably be washed away by the current of Chaos and will eventually dissipate.

The colorful stone is different, the colorful stone will not be corroded by the chaotic air, but will continue to absorb the chaotic air to strengthen itself.

Therefore, the fortress built with colorful stones can stay in the sea of ​​chaos forever.

of course……

If it encounters too big a chaotic storm, the colorful stone building may collapse.

With the colorful stones, Zhu Hengyu rushed to the eighteenth floor of the purgatory furnace.

After taking out all the colorful stones and summoning the real fire of purgatory, Zhu Hengyu tried his best to refine it.

Time goes by day by day...

The refining of colorful stones is very difficult.

Even the real fire of purgatory is not so easy, you can easily refine the colorful stones.

If not, if Ling Jade War is embodied in the Great Sacred Realm, it can't even be refined.

Time is in a hurry...

In a blink of an eye, more than three hundred days, nearly a year passed.

More than 30 million colorful stones were finally completely refined and turned into a pool of liquid that exudes colorful glory.

Zhu Hengyu finally breathed a sigh of relief.

While probing with his right hand, Zhu Hengyu sacrificed the profound vein from the mysterious world!

Under the control of Zhu Hengyu, the red-black profound veins, like a dragon, got into the liquid made of the colorful stone and disappeared...

next moment……

As the profound veins drilled in, the pool of liquid exuding colorful and brilliant light began to violently oscillate.

Between the violent turbulence, a black and red building with a diameter of three kilometers rose from the ground!

Three hours after the profound vein injection.

A majestic fortress of three kilometers in vertical and horizontal directions, full of black and red, appeared in front of Zhu Hengyu.

This fortress has only one storey in total and is square!

The height is about 100 meters...

Each corner of the fortress has a tower.

At the top of the fortress is a thick wall.

Surrounded by four city walls, is a three-kilometer square.

Of course, this fortress is only a shell for the time being.

Above the fortress, no runes and formations have been depicted.

However, even so, this fortress was enough to enter the Chaos Sea and existed for a long time.

As a fortress of chaos, there are two things most importantly.

The first point is that the material of the fortress must be able to resist the erosion of the chaotic air in the sea of ​​chaos.

The second point is that there must be a source of power to provide a steady stream of energy.

Now, this fortress made of colorful stones already possesses these two points.

As for the next refining, it takes a very long process.

Zhu Hengyu alone would probably not be able to be refined without thousands of years.

Fortunately, Zhu Hengyu is now more than one person.

As he explored with his right hand, Zhu Hengyu put the three-kilometer-long chaotic fortress into the dimensional space.

After the realm was upgraded to the Great Sacred Realm, the power of the dimension had become a basic ability.

Without any magic weapon or magic weapon, you can open up a small world within your body.

therefore……

Although this fortress of Chaos is three kilometers in length and breadth, it can still be easily installed for the Great Sage.

After putting away the Chaos Fortress, Zhu Hengyu returned to the mysterious world through the soul channel.

With a big wave...

Zhu Hengyu cast the Chaos Fortress on the ground of the Xuantian World. In the next time, the next refining of the fortress will be handed over to the Xuantian Law Body and the Collapse Warriors.