In order to figure out why there were 'black silk threads' in this vein, Su Xing sat in place and waited silently.

After a long time.

As the monks finished their work one after another, Su Xing was the only one left in the mine.

He looked around and made sure that no one was watching him, and immediately turned on the 'Transformation' state, quickly submerging into the vein.

Strictly speaking, the spirit stone veins in Heicheng are renewable resources.

Although the caves are mined day and night, every ten days and a half, new veins are created from the caves.

The faster the monks mined, the faster the spirit stone veins were generated, and the specific reason for this is unknown.

In this way, a perfect virtuous circle is formed.

Some of the older low-level monks have been working in the Black City veins for decades, and even until they die.

Most of the descendants of these low-level cultivators were reduced to mortals again because they had no cultivation talent, so they could not be powerful.

And some mortals, because they were born with the Purple Mansion, were promoted to the low-level monk class, so they had hope.

This process may seem like promotion, but in essence it is all about labor, and at best it is a change in the location of the work.

'Perhaps, one of my children will be able to produce an immortal cultivator?' ’

With this in mind, the mortals of the Black City have been working for hundreds of years, so that there is no end to the number of children and grandchildren.

They unearthed countless spirit stones for the Black City.

Countless low-level monks and mortals live and die, while the celestials and high-level monks are eternal.

Inside the vein.

Just like Su Xing guessed.

After he entered it, he found that there was really a cave inside this spirit stone vein.

What the veins contained was not an extremely rich aura, or a large amount of spirit stone ore, but countless corpses piled up into a mountain!

And these corpses are also the reason why the 'black silk thread' is emitted in the ore vein....

At first glance, the corpses were both old and young.

There are monks, and there are mortals.

They all had only one or two days left in their chests, and they were killed by some special means and transported here in a centralized manner.

As for the role of these corpses being placed in the spirit stone veins....

Su Xing found that on the body surface of these corpses, there were dense 'crystal mushrooms'.

It is different from the 'crystal mushroom' that grows out of the ground.

These mushrooms, which were born from the corpses of mortals and monks, had a translucent surface that looked like glass-like crystals.

Thereinto.

Some of the larger, long-growing 'crystal mushrooms' gradually turn from translucent to dark gray.

These ripe 'crystal mushrooms' have a texture that looks more like rocks....

Or rather, it is the raw ore of the spirit stone.

After discovering this, Su Xing immediately understood:

The so-called spirit stone veins in this cave are not actually natural, but formed by countless dead people who have eaten 'crystal mushrooms'.

And the reason why Heavenly Court will establish a human settlement again is not for the mineral veins here.

Black City is rich in 'crystal mushrooms', and mushrooms are capable of feeding a large number of humans.

After the death of a human who eats the mushroom, a vein of spirit stones can be formed, so that a large number of spirit stones can be produced....

And this may be the true meaning of the existence of the black city.

In order to make it easier to distinguish, the mushrooms that Su Xing planted in the ground are still called 'crystal mushrooms'.

Mushrooms born from human flesh and blood are called 'flesh mushrooms'.

He remained in a state of flux, continuing to observe the inside of the vein....

The 'Flesh Mushroom' is born from flesh and blood, and will gradually crystallize and solidify into the original spirit stone ore.

In this way, the 'flesh mushrooms' are divided into two forms:

The first type is a 'flesh mushroom' that has been born for a period of time and is translucent and glass-like as a whole.

The second type is the mature 'flesh mushroom' that has matured, has a gray surface, and is about to form a spirit stone ore.

Of course.

In addition to these two forms, there are also a small number of corpses with newly born juvenile 'flesh mushrooms' on the surface.

It is precisely because of the recent birth that these 'flesh mushrooms' take on the appearance of flesh and translucent crystals.

These 'flesh mushrooms' are indeed transformed from flesh and blood....

This couldn't help but make Su Xing have a conjecture in his heart.

First of all, the world in which he lives is not a novel, but a real world with sound logic.

Therefore, everything in the universe must follow the law of conservation of matter, and energy cannot be created in a vacuum.

Then the same must be true of Reiki, its birth must have some source....

From this, it is not difficult to guess whether the ubiquitous aura that pervades this world will all come from human flesh and blood.

And if you speculate further.

Since the spiritual power of the whole world comes from the flesh and blood of human beings....

Then equivalent substitution.

The demons and monsters of this world, their behavior of confusing and devouring human beings is not equivalent to the monks absorbing the spiritual power of heaven and earth?

For example, the 'longevity ghost' who absorbs the essence and flesh of a person whose life span is about to expire....

Of course.

Among these many strange things, there is also a transcendent existence outside the object, which Su Xing cannot understand.

- That's the unspeakable creature.

The indescribable creature 'longevity' feeds on human lifespan, and the concept of longevity has no physical dimension.

In order to understand all this and know more secrets, Su Xing needs to have a stronger cultivation and be exposed to more things....

The 'flesh mushroom' in the spirit stone vein grows extremely fast.

In just the short time that Su Xing entered the ore vein, there were more than ten mushrooms, which gradually grew from glass form to spirit stone ore.

It is estimated that in one night at most, all the human corpses inside this vein will be transformed into spirit stone ore.

Perhaps it is precisely because of this that the monks have never discovered the secrets inside the spirit stone veins.

- After all, they don't even have the speed at which 'flesh mushrooms' can be converted into raw ore.

Inside the spirit stone vein.

After observing for a long time, Su Xing carefully switched back to the normal state.

After discovering that there was no danger inside the vein, only that the air was a little thin, Su Xing gradually became more confident and bold.

He tapped the storage bag on his waist and took out a dagger from it, attaching spiritual power to the surface of the dagger.

Su Xing carefully cut off the 'flesh and blood mushroom' that was still in the growth stage by cutting the spirit stone ore, and tried to avoid touching it directly with his hands.

After observing several 'flesh mushrooms' at different growth stages, Su Xing found that:

As soon as these 'flesh mushrooms' leave the human body, they immediately stop growing and remain in their current state....

In the field of refining life medicine, Su Xing is half an expert.

The formula of the life pill contains a small amount of protein.

When Su Xing first refined the life pill, he used beef to replace these protein components.

After that, he tried chicken, fish, pork and other substitutes one after another, and found that the results were almost the same.

In short, no matter what kind of material Su Xing adds, it will never achieve the medicinal effect of Heavenly Court....

——The life pill refined by Heavenly Court can be swallowed directly by mortals without any side effects.

However, what Su Xing refines will make mortals mutate.

It must be because he didn't find a suitable protein replacement.

So....

Looking at the 'flesh and blood mushroom' he had cut, Su Xing instantly had a bold idea:

The 'Flesh and Blood Mushroom' is generated from human flesh and is still considered a protein component until it is completely transformed into a spirit stone ore.

If you add these mushrooms to the raw materials of the longevity medicine, can you make up for the shortcomings of the longevity medicine?

When the people of Heavenly Court were refining the life pill, would they do just that?

If he could, Su Xing's Life Elixir would be able to sell it to mortals in large quantities and collect more 'Black Silk Threads'.

At that time, isn't promotion to the foundation building period as simple as eating and drinking?