There is a very small natural cave in the canyon, and after looking for it, Yang Cheng felt that this place was good, and he was ready to meditate here and take a rest, and he would continue to search for it.

However, in the process of cultivation, Yang Cheng suddenly keenly felt that this small cave seemed to be filled with an indescribable hot and dry aura.

Moreover, the concentration of aura in this cave seems to be a little higher than that outside.

So Yang Cheng didn't even care about resting, took out the Qing Ying Sword and slashed it on the stone wall of the cave, and immediately found that the stone of the cave was obviously much harder.

Then it was discovered that the stone wall of the cave was a separate circle, and the innermost part extended all the way, and finally formed a stone ring and drilled down into the ground.

Seeing that this cave was so abnormal, completely different from what Yang Cheng had encountered before, he began to dig underground along the small hole that was completely blocked.

After digging down five or six zhang, the hot breath in the passage became more and more obvious.

And the temperature is gradually rising, as if there is a huge furnace underground.

Seeing this scene, Yang Cheng frowned slightly, and after a little thought, he withdrew from the underground passage and returned to the surface.

Because Yang Cheng didn't know what to expect next, although this place was sparsely populated, in order not to be disturbed, Yang Cheng had to make some preparations.

Gently patting the storage bag, Yang Cheng took out the blue-white array disk, put it at the entrance of the cave, and added the spirit stone.

Then he quickly played the spell with both hands, opened the array disk, and laid out a simple prohibition that could cover up the fluctuations of the aura.

Seeing the transparent spiritual power barrier rise and completely cover the cave, Yang Cheng relieved himself with satisfaction and returned to the underground passage again.

"Poof..."

Under the full force of the Blue Immortal Sword, the hard stone shattered layer by layer.

Yang Cheng spent a night of hard work, and after digging thirty or fifty zhang into the ground, the stone ring finally expanded into a stone wall.

Standing in front of the stone wall, Yang Cheng wiped the sweat from his face, stretched out his hand to press on it, and immediately let go.

Not only is the temperature extremely high, but the walls are noticeably harder and thicker than the previous ones.

"It can't really be a stove in there!" Seeing this scene, Yang Cheng was also a little uncertain.

There's a furnace hidden underground? Thinking about Yang Cheng is incredible. But he was even more pleasantly surprised.

No matter what is inside the stone wall, if you think about it, you will not let Yang Cheng go home empty-handed, then it will be worthy of Yang Cheng's hard search for more than a year.

Before preparing to break through the stone wall, Yang Cheng returned to the ground again and meditated to recover his mana.

When it was over, Yang Cheng came to the stone wall, and under the operation of mana, a faint layer of spiritual power shield appeared on his body.

Then he grabbed the Qingying Sword and slashed at the stone wall.

After slashing seven or eight swords like this, a small opening was finally made in the stone wall, and at a glance, it was actually red.

"Poof......

Yang Cheng was about to take a closer look, when at this moment, an extremely hot flame suddenly erupted from the broken opening.

Yang Cheng was taken aback, his toes were a little, and his body rushed backwards.

But the flamethrows seemed to be faster and faster, as if they had been built up for countless years.

After completely returning to the ground, Yang Cheng found that the spiritual power shield on his body had long been broken, and his face felt hot.

Even my eyes couldn't open for the time being, and it hurt like a pinprick in a pin.

Surprised, Yang Cheng hurriedly took out a pill and threw it in his mouth, and sat down to exercise pranayama.

This is two days and two nights.

During this period, Yang Cheng couldn't stand the smell in the cave, so he had to open the array plate several times to disperse the smell inside.

However, Yang Cheng also determined from this that there was no one else here except him. Otherwise, such a strong smell would have come and check it out a long time ago.

Wait until the flames from the cavern have weakened, until they are completely gone.

When Yang Cheng felt the temperature in the cave drop to bearable levels, he finally got up and entered the underground passage again.

When the opening on the stone wall was widened, the scenery presented inside made Yang Cheng both shocked and excited.

It turns out that in the middle of the stone wall is an oval-shaped cave that extends inward.

And the walls of the cave are like the stomach of a beast, as if they have been compressed by something, forming layers of extremely uniform folds.

Each fold is made up of pieces of stone, like the bricks used to build a house in the world. It's just that the bricks here are several times larger.

The entire cave was red, glowing red like a flame.

The scorching breath came to his face, and the entire cave was a red light under the reflection, and after a few glances, Yang Chengcheng felt that his eyes were stinging and tearful.

Due to the texts I have read and the information I have obtained, this is not the case.

Yang Cheng wasn't sure if there was an environment where the fire phoenix litmus appeared.

Or, maybe it's something else.

Yang Cheng cautiously took out a talisman, silently recited the mantra and patted it lightly on his body.

The talisman disappeared in an instant, turning into a thicker barrier of spiritual power.

Wrapped Yang Cheng from head to toe, completely blocking the scorching breath, and even the eyes could observe normally.

Relieved, Yang Cheng raised his feet and walked into the cave.

The belly of the cave is not large, and under the deliberate search, Yang Cheng quickly discovered it.

Leaning on the top of a low stone pillar inside, there was a piece of jade the size of a child's palm, red all around, with some transparent in the middle.

Inside the jade, there is a faint golden-red liquid flowing slowly, like a phoenix in a painting book, dragging its long tail feathers, circling and flying.

It was exactly one of the materials that Yang Cheng was looking for to refine the sword fetus, the fire phoenix litmus.

"Not good!"

Such a natural treasure made Yang Cheng fascinated and forgot the time.

Later, I suddenly found that my body was already sweating and pulping.

The aura shield transformed by the talisman is now only a thin layer, and it is still dissolving at a speed visible to the naked eye.

It is estimated that it will not be long before Yang Cheng will face the terrifying high temperature in the cave with his true body.

Without thinking, Yang Cheng hurriedly took out a talisman again and stuck it on his body.

That's when I felt comfortable.

Then Yang Cheng hurriedly took out the Qing Ying Sword and pried the jade from the low stone pillar.

He took out the box that had already been prepared from the storage bag, picked up the fire phoenix stone core with the Qing Ying Sword, and carefully put it into the box.

Stick a talisman on the outside of the box to prevent the breath from leaking, and then put it in the storage bag.

As soon as Yang Cheng exited the stone cave, he heard a soft "click" in his ears.

I saw that the aura shield that the second talisman had turned into had completely collapsed after the aura was exhausted.

Yang Cheng only bought two such talismans in total, and he used them all at once today.

Looking at the cave belly with some regret, Yang Cheng in the innermost part didn't even have time to check it.

Although it cost a lot of money, Yang Cheng was also very satisfied with the fact that he had obtained the main material for refining the last sword tire.

Unwillingly, he looked at the layers of stone bricks in the cave, which seemed to be wriggling in the light.

After countless years of calcination, it is extremely pure, and if you take it out, you should be able to sell it for a good price!

It's a pity that Yang Cheng not only didn't have anything to hold stone bricks, but even the talisman was used up.

With a sigh, Yang Cheng returned to the ground.

Later, the excavated tunnels were completely blocked.

Or many years later, a new fire phoenix litmus will form here.