Time flows silently like water.

It's a month in the blink of an eye.

This month, in addition to meditation, Lu Yu is also studying formation and kendo.

The way of the talisman stops at the small solution of the talisman, and there are really no more books about the talisman to study.

The Lei Fa has been thoroughly mastered, but if you want to cultivate to the fullest, it is no longer a matter of proficiency, but a matter of cultivation to the realm.

With Lu Yu's current sixth-layer Qi cultivation realm, he can't completely control the thunder and lightning, so he can only use his strength to lower the thunder.

As for "The Secret Art of Yin and Yang Feng Shui", this is even more difficult.

This secret art, after entering the door, it is difficult to make progress in a short period of time.

If you blindly practice penance, you won't gain much at all, and you need a flash of epiphany.

However, epiphany is rare after all, especially in this world where the aura is completely depleted, and the cultivation is even slower.

Therefore, there are only two main directions of attack at present.

One is the way of swordsmanship.

One is the way of formation.

In the way of swordsmanship, Lu Yu has already comprehended the sword intent, which can be described as rapid progress, and now he has mastered everything in the third layer, and is infinitely approaching the fourth layer.

But because the cultivation level is too low, it is difficult to cross this threshold.

As for the formation, the progress is also obvious.

He has been able to create low-level defensive formations, as well as ecstasy formations that make people trapped in them and unable to get out.

The progress in the formation has made Lu Yu closer to his goal!

Lu Yu has always wanted to use the formation to construct a 'cave sky' with abundant spiritual energy.

In this square cave heaven, in addition to cultivation, you can also grow some spiritual fruits, spiritual rice, and some spiritual medicines.

In this way, it can prepare for the later alchemy.

The Four Arts of Cultivating Immortals: Alchemy, Refining, Formation, and Talisman.

Now Lu Yu has mastered the formation and talisman, and as for the alchemy and refining tools, he has not yet found the true method.

In fact, even if the true method is found, it is still impossible to refine it due to the limited raw materials.

Whether it is alchemy or refining, it cannot be refined out of thin air, and corresponding raw materials are required.

And this world has long been depleted of spiritual energy, where to find these?

Either get it from the future, or find a way to grow it yourself.

Now that Lu Yu is using spirit stones to cultivate, the speed is actually not fast, far inferior to the effect of the pill.

It's just the level of Qi training, and the gap is not huge, and when the foundation is built in the future, or even the Dan is knotted, the gap will be very big.

Therefore, the art of alchemy must be mastered!

this day.

Lu Yu was practicing when he received a message.

The gold department dug up a strange tomb.

The tomb was completely sealed like copper and iron, and the entrance could not be found for a while.

Even if you want to dig a hole in the ground to enter the tomb, you still can't get in!

The foundation of the tomb was also made of copper and iron, and it fit perfectly with the wall, and there was not the slightest gap!

I really couldn't find a way to open the tomb, so the gold department simply went to the top and applied for gunpowder assistance.

Because the gold department is directly subordinate to Lu Yu's department, it only serves Lu Yu alone.

Therefore, the officials of the Ministry of Industry naturally understood the importance of this department and immediately sent assistance.

Several professional blasting experts came to the scene.

They have had many experiences with mine blasting and are veterans.

After a simple estimate, the first detonation was carried out by burying the powder pack in a suitable location for blasting.

However, when the gunpowder pack exploded, the tomb made of copper and iron was not moving.

The blasting experts did not give up, and carried out several more blasts, each time the amount of gunpowder was more and more than the last, but it still did not have the slightest effect.

The iron walls of this tomb seem to be surprisingly thick, and even with low-grade explosives such as black powder, no matter how large the number is, it will not help.

There was no way to open the tomb, and the gold department could only pass the news to Lu Yu.

Not much.

When Lu Yu arrived at the scene, he saw this strange cube tomb.

The walls of the tomb, like obsidian, exude a unique metallic luster.

The shape is too bizarre, like a futuristic technological product.

Appearing in this era, it seems extremely strange and out of place.

Lu Yu came closer, touched the wall of the tomb, and realized that this thing was definitely not a simple copper and iron pouring.

There seems to be traces of the existence of the aura!

Because of the particularity of the material, even if there is no aura now, it is still exceptionally strong, and the gunpowder cannot be exploded, which is really normal.

"Is this ...... Millennial Darkiron? ”

Lu Yu recalled that in the Yin Yang Feng Shui secret technique, he subconsciously made some guesses about the introduction of some minerals, and was immediately shocked by his own thoughts.

"If it's really a thousand-year-old iron, how heavy should such a large piece of thousand-year-old iron?"

"The thousand-year-old dark iron is the best of the dark iron."

"Among the ancient books I have read, a small piece of thousand-year-old black iron can cause a lot of people to rob it."

"This is a treasure among treasures, if this is really a thousand-year-old Xuantie...... Isn't that too much? ”

"If that's the case, what kind of people are buried in this?"

Thinking of this, Lu Yu was inevitably a little moved.

Fear......

It's really a legendary ancient immortal!

To say the least, it's a top power!

A powerhouse of this level, if he wakes up and crushes Lu Yu to death, I'm afraid it's as simple as crushing an ant.

However, even if this great power is revived, even if Lu Yu is killed, there will be a price!

In this era of depleted aura, it is impossible to sleep again.

Therefore, even if this immortal wakes up, he will not forcibly break through the self-sealing without being threatened......

Of course, even so, the danger remains.

But if Lu Yu wants to go further, digging up these ancient tombs and looking for the true law of the past, it is indispensable.

Now that the opportunity is in front of us, how can we look ahead and be afraid because there may be danger?

Lu Yu shook his head and threw away his distracting thoughts.

Not to mention the danger.

At the moment, how to break through the dark iron wall and whether you can enter it is the key......

Let's try it first.

Lu Yu casually drew his sword.

This is the Sword of the Son of Heaven, which was once one of the treasures treasured in the treasure house of Luoyang.

Although it is just an ordinary product, after the cultivation of aura and sword intent, there is already a trace of spiritual charm.

Using this sword to release the sword is much more powerful than releasing the sword with empty hands.

Of course.

This Tianzi sword, the cultivation time is too short, and the sword light it carries is limited.

It's okay now, but if Lu Yu raises the realm again, he won't be able to carry it.

At that time, under a single blow, the sword body may be directly shattered.

This requires the method of refining weapons, refining a spiritual weapon.

and then nourish it to improve the level of the spiritual weapon.

In addition, it is necessary to refine it again to strengthen the connection between the spiritual weapon and one's own mind and spirit.

In the end, the impurities had to be quenched and refined into a magic weapon.

If there is really such a natal magic weapon, Lu Yu's combat power will be greatly improved.

But for now, it is clear that there are no conditions for this.

"Get out of the way."

Lu Yu glanced at the people left and right, and said lightly.

When everyone heard this, they were stunned, and then quickly walked away.

The Tufu people of the Ministry of Touching Gold all know that the Immortal Emperor is not a mortal, and at this moment, I am afraid that he will reveal his immortal means, and they are looking forward to it, wanting to see it.

And those blasting experts in the Ministry of Engineering, at this time, their eyes widened one by one, and even gunpowder blasting could not blow up the copper wall and iron wall, and used their swords...... Can it be cut open?

Of course, they had heard of Lu Yu's immortal name.

But they still can't believe that manpower alone can be more powerful than gunpowder blasting!

They used a lot of gunpowder, but they didn't even blow up a crack......

As the crowd retreated to a certain distance.

A flash of cold light.

The majestic sword momentum rolled in, and everyone who saw this scene with their own eyes only felt that their scalps were numb for a while, and their eyes were a little stinging!

Then came a loud bang!

'Knock~!! ’

The sparks were raised high, and the sound of swords and iron clashing was deafening.

Everyone hurriedly covered their ears and looked at the scene in front of them in dismay.

Under Lu Yu's sword, the iron wall was torn open with a huge opening!

On top of the iron wall, the tear is very deep, and the depth is close to a foot!

The power of one blow is truly terrifying!

What's even more terrifying is that even so, this tomb has not yet been broken.

How can this iron wall be so thick?

Could this thing be ...... Is it solid?

And Lu Yu looked at the hideous mouth in front of him, and without hesitation, it was another sword!!

With the complete dissipation of the aura, the thousand-year-old Xuantie, which was once extremely strong, was not much different from mortal things at this moment.

If the aura was still there, even if Lu Yu swung the Son of Heaven Sword in his hand, it would be impossible to cause such damage.

Another sword, finally breaking through the iron wall, tearing open a hole big enough to enter.

The mouth is not frontal, but a horn, so the sword does not damage the items in the tomb.

"Hold this place and don't let anyone in." Lu Yu glanced at the people behind him and said lightly.

"Whoa!" Everyone was shocked by Lu Yu's methods, and they were stunned for a moment, and then they responded one after another.

Lu Yu held his breath and bent down into the immortal tomb.

The light inside the tomb was dim and the air was turbid, but Lu Yu's eyesight was extraordinary, so he could see it really.

In the southeast corner of the tomb, there are corpses neatly placed.

Even though I don't know how many years have passed, the corpse is still not completely corrupted, but has become a dried corpse, and I can vaguely see the appearance before death.

There were three men and three women in total, who seemed to be ancient cultivators, and there was no breath on the corpse, and all the aura was lost.

Lu Yu did not hesitate, and waved his hand to put the corpses of the six people into the Dragon Ball.

Then he continued to explore.

The corner opened by Lu Yu seemed to be a small room in the tomb.

Push open the door of the room to enter other spaces.

Lu Yu glanced at it, and what came into view was a corridor.

Corridors connect the rooms.

Lu Yu carefully opened all these rooms.

These rooms are stocked with a variety of items.

They are - the clothing storehouse, the grain storehouse, the music storehouse, the arsenal, the wine storehouse, and the library.

What can be seen with the naked eye is that these former spiritual objects, with the depletion of spiritual energy, have long lost their spirituality and become ordinary utensils.

Whether it is the clothes of the immortals, or the spiritual rice, the spiritual wine, or the musical instruments and weapons, they have all lost their spirituality.

Some things may be repaired, but the cost of fixing them is probably greater than making a new one.

The only ones of value are the animal skin books in the library.

Most of them have the True Dharma in it.

However, Lu Yu did not rush to read it, but incorporated all these things into the Dragon Ball.

The already small space was suddenly crammed to the brim!

Lu Yu continued to explore.

Finally, he made it to the main burial chamber at the core!

Push open the door.

In the middle of the main burial chamber, there is a huge coffin!

And on top of that huge coffin, there seems to be a person sitting?

Lu Yu couldn't help frowning.

The light in the main burial chamber was even dimmer, and even Lu Yu couldn't see it clearly.

Lu Yu casually drew a talisman in the air, which was a simplified version of the fire summoning talisman.

Relying on spiritual power, drawing in the air, and raising the proficiency of the fire calling charm to the extreme, you can play like this.

Under Lu Yu's drawing.

A small ball of fire came out of nowhere.

The appearance of the fireball made the main burial chamber instantly extremely clear.

The huge coffin was made of black wood, and there was really a person sitting on it.

It was a child with his eyes closed, as if he were taking a nap.

The child is dressed as a Taoist child, combed with two braids, and looks exquisite, because he is too young, he can't tell whether it is a man or a woman.

The depletion of the aura and the passage of time did not make this Dao Tong a dry corpse, but lifelike, as if he was still alive.

At this moment, the main burial chamber was extremely quiet, and there was no sound except for the sound of fireballs burning.

Lu Yu couldn't hear Dao Tong's breathing.

I couldn't hear the sound of Dao Tong's heartbeat.

It's dead...

Lu Yu calmed down a little and took a step forward.

The firelight reflected the face of the Taoist boy, because it was too perfect, but it was not like a real person, and there was a strange sense of disobedience.

Just as Lu Yu took a step forward, the dead Dao Tong suddenly opened his eyes!

A pair of green eyes, staring at Lu Yu!

(End of chapter)