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Hearing that the Flame Red Lotus can be planted in the Black Iron Castle, this news can make Zhang Tie very happy, no matter what, it is a good thing for himself to have one more hole card and one more resource in his hand.

Zhang Tie suddenly thought of another question, "How long does it take for the Flame Red Lotus to mature after it is planted?" ”

"The growth cycle of silicon-based plants is very long, and it generally takes more than 6o years for the seed of a flaming red lotus to be planted to flowering and fruiting, and then to fruit maturity!"

Hearing this answer, Zhang Tie's smile suddenly froze on his face, but Heller's words were not finished.

"But if you are willing to put a large amount of aura value into this plant, you can greatly speed up its growth cycle, and you can make it mature within half a year at the earliest, with the current aura supply level of the Black Iron Castle, put all the aura value into a lotus seed of a flaming red lotus, so that it can mature in about two years!"

Zhang Tie thought about it, the aura value of the Black Iron Castle did seem to have the effect of speeding up the growth of plants, but he didn't expect that the effect of the aura value was also effective on the Flame Red Lotus.

"Can you use the space and terrain transformation functions of the Black Iron Fortress to create an underground environment suitable for the growth of the Flame Red Lotus?"

"Yes, the basic energy reserves accumulated by the Castle Lord when he was on Qianlong Island can now support a small area of the Crypt Layer's space and terrain creation!"

Hearing such an answer, Zhang Tie didn't wait for a second, and directly called up the management panel of the Black Iron Castle in the real room, and after clicking the "Space and Terrain Creation Zào" button in the menu bar in the panel, three familiar sub-classification menus suddenly appeared in front of Zhang Tie's eyes.

-- Surface Layer Options

- Crypt layer option

- Underwater layer option

Zhang Tie directly clicked on the Crypt Layer option, and in an instant, a three-dimensional image including the underground section of the Black Iron Fort appeared in front of Zhang Tie's eyes.

Since owning the Black Iron Castle, Zhang Tie has seen the whole picture of the underground world of the Black Iron Castle for the first time.

The entire Black Iron Castle, in this three-dimensional image, is completely a cube, and the depth and thickness of the Black Iron Castle's underground are almost 8oo meters deep, which is exactly the same as the length and width of the surface area of the Black Iron Castle.

In this holographic three-dimensional figure that includes the underground structure of the Black Iron Castle, Zhang Tie saw the depth of the soil layer and rock layer under the freshwater lake, which is only a few tens of meters deep, compared with the other places in the "original" version of the Black Iron Castle, the thickness of the underground layer of the new land area is very thin.

"What's going on here? Why is the thickness of the underground layer different here than in other places? Zhang Tie asked Heller.

"This is the thickness of the soil and underground layer when using the space and terrain creation function of the surface layer by default in the Black Iron Castle, if the thickness here is the same as other places, I am afraid that you have not saved up so many energy reserves by now!" Heller explains, "For creatures living on the surface, there is no point in having too thick a layer of the ground, it is a waste of basic energy reserves!" ”

"If I need a little deeper underground layer under this lake, can it be the same as anywhere else?"

"Lord Castle can try, as long as there is enough energy reserves, there is no limit to the expansion of the entire Black Iron Castle whether it is the expansion of the surface area or the extension of the underground layer, if your basic energy is sufficient, you can make the thickness of the underground layer of any part of the entire Black Iron Castle extend more than a million kilometers without a problem, and the space and terrain structure of the entire Black Iron Castle are equal to a blank sheet of paper for you at any time!"

Zhang Tie nodded, and secretly sighed in his heart, just this function, the Black Iron Fortress's demand for basic energy reserves is almost endless, even if he has the ability to suck up all the seawater of a sea, the Black Iron Fortress can easily consume all those basic energy, it seems that increasing the basic energy reserves is really a long-term job, and it can't be relaxed at all.

Looking at the underground of the Black Iron Castle, Zhang Tie didn't talk nonsense, and directly projected the cave landform of part of the underground layer of the Island Dragon Cave that he still had an impression of in his head and the environment for planting the Flame Red Lotus that he imagined onto the three-dimensional hologram, and after several adjustments and deliberations about the current basic energy reserves of the Black Iron Castle, an image of the approximate crypt layer appeared on the three-dimensional hologram.

The entrance to the crypt layer is located in the middle of the Black Iron Castle to the south, only more than a hundred meters away from where Zhang Tie is now, located in a pine forest, the entire entrance is a small hill protruding more than ten meters above the ground, and a spiral like a staircase extends downward into the cave until it is 100 meters deep underground.

At the end of the cave, Zhang Tie opened up an underground cave space the size of half a football field, and on the ground of the space, there were two irregularly shaped magma lakes the size of basketball courts, and several meandering gullies more than two meters wide flowing with magma connected the magma lake.

"The color of the magma lake is too white, and the temperature of such magma is too high, and the temperature of the magma suitable for the growth of the Flame Red Lotus should not exceed 8oo degrees Celsius!" Heller, who had been watching from the side, said while skillfully manipulating on the stereoscopic hologram, Zhang Tie saw that he turned the color of the magma a little redder, and the map showed a magma temperature of 617 degrees Celsius, Heller stopped.

After doing this, Heller nodded.

――If the Castle Lord's visualization of the Cave Layer is less than 8, does it allow the system to enable the random laws of natural creation to make up for the other missing parts of the construction? When the system starts to build the Law of Nature's Creation Method, the Castle Master can use the manual method to adjust it!

- Agreed...... disagree

Zhang Tie chose to agree.

In just an instant, all the vague details of the underground space and terrain that appeared on the stereoscopic hologram suddenly became clear and vivid.

――The new crypt layer space has been opened, and minerals will appear in the crypt layer, does the castle lord need to appear mineral resources in the crypt layer?

- Yes...... Not!

Can minerals appear? Zhang Tie was taken aback by this option, "Ah, wouldn't it be possible to generate any minerals underground with whatever minerals you want, and wouldn't it be if you get a gold mine and a crystal mine here!" ”

"It's not that simple!" Heller shook his head, "The types of mineral resources that can be selected by the Crypt Layer Space and Terrain Creation Function of the Black Iron Fortress are only limited to the types of minerals that the Chaos Pool has absorbed and dissolved, and it is not infinite, and you can systematically generate whatever minerals you want. Moreover, when generating specific minerals, the system will also consume a large amount of basic energy reserves and a large amount of merit and aura values, and now the Black Iron Castle cannot afford to play this kind of advanced function at all. ”

Zhang Tie gave it a try, and now after he chose "yes", the only minerals that could be generated in the underground space were low-quality pyrite and low-grade crystal ore, which were exactly what he threw into the Pool of Chaos during the trial in Wild Wolf Valley.

He had only slightly generated a small belt of pyrite underground, and the basic energy reserves, merit and aura values of the Black Iron Castle had already turned red negative.

The same goes for choosing to generate low-grade crystal ore, which is a huge amount of merit and aura compared to pyrite.

Depend on! Zhang Tie scolded secretly, completely breaking off the unrealistic idea of using the Black Iron Fort to generate cherished mineral resources.

In this way, Zhang Tie's understanding of the Black Iron Fort has deepened a little, and the qiē harvested here is all causally related, and the so-called planting melons and getting melons and planting beans and beans is probably talking about the situation inside the Black Iron Fort.

……

――The following resources are required for the creation of the space and terrain of the crypt layer:

Basic Energy Reserve - 713698, Aura - 3519o, Merit - 4822

――Is it a zào?

- Yes...... Not......

- Yes!

- The creation of the space and terrain of the crypt layer will start in half a minute and will take 18 seconds, during which the castle lord will not be able to leave the Black Iron Castle.

――Countdown to the creation of space and terrain in the crypt layer: 3o...... 29…… 28…… 27…… 26……

"I remember the last time I created that spring, the Black Iron Castle needed me to leave here to complete the space and terrain creation, why did I not leave this time to complete it?" Zhang Tie asked Heller that he still remembered the shock he had from the spring water last time he still remembered, and when he came in less than half a minute after leaving the Black Iron Castle, a sweet spring appeared, making him wonder if he was dreaming.

"Because the Black Iron Castle and the Castle Lord are one, the frequency of energy fluctuations generated by the space and terrain creation here will affect the stability of the Castle Lord's spiritual power, at that time, your spiritual power was very low, and it would be very dangerous to feel the space and terrain creation in the Black Iron Castle, once your spiritual power resonates with the energy frequency generated by the space and terrain creation, it will make your head explode!"

"Wouldn't the others and other creatures?"

"No, this kind of situation where the spiritual power resonates with the energy of the Black Iron Castle will only appear on you!"

Zhang Tie understood, and at the same time was full of curiosity about how the Black Iron Castle completed this terrain creation, he walked out of the real yàn room and looked at the pine forest more than a hundred meters away to the south of the real yàn room.

……

――Countdown to the creation of space and topography in the crypt layer: 5...... 4…… 3…… 2…… 1。

The entire Black Iron Castle suddenly darkened, and then the colorful clouds and mist surrounding the Black Iron Castle slowly began to light up, and in just a few seconds, the dazzling colorful strong light made Zhang Tie involuntarily close his eyes and block it in front of him with one hand.

Zhang Tie, who had his eyes closed, only felt that the entire space of the Black Iron Castle was filled with light, and the light was omnipresent, and his spiritual power was beating and irritable in the light, making his two ears involuntarily have tinnitus and auditory hallucinations.

By the time Zhang Tie felt that the colorful bright light in the Black Iron Fort had disappeared and he could open his eyes, the terrain in the pine forest a hundred meters away had changed, and there was a small hill more than ten meters high, and a swarthy cave had already appeared......

……

Today's two watches, I can finally shout confidently for a monthly pass! (To be continued...!)