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Although Li Yunfei didn't have much contact with the magic crystal before, he also knew something about it when he chatted with Yanbo.

Among the human realms, there are only three Golden Imperial Cities and one of the twelve Silver Imperial Cities that possess the Demon Crystal Vein. This thing can be said to be the second life of the mage, and it is also the source of energy for many alchemy equipment, so it is extremely precious.

There are not many magic crystals in the entire Roland City.

And the ore veins of the three Golden Imperial Cities are the most pure, and the supply of this high-level strategic material is also a way for them to control the Silver King City and the Black Iron General City below.

The Black Iron General City at the lowest level, and the Silver King City at the middle level, contribute a large amount of materials to the three Golden Imperial Cities every year, in exchange for only a small amount of magic crystals and some high-level alchemy equipment.

This shows how precious the magic crystal is!

And now, right under Li Yunfei's feet, there is very likely to be a fire-type magic crystal vein! Sure enough, only in the territory of the giants can there be this kind of ownerless magic crystal vein!

Without the slightest hesitation, Li Yunfei immediately stabbed the blade of the Baipi Knife into the inner wall of this crack, sliding down little by little.

While slipping, he reached out and pulled off all the exposed magic crystals next to him and threw them into the space bag.

From the white mist rising just now, he could feel that the temperature in the depths of the crack was not particularly high, and he wanted to see what was down there.

After descending a distance of hundreds of meters, after a while, his feet were on the ground.

Pulling out the Baipi knife from the stone wall, he turned around and looked back, and immediately found that there was an extremely huge space at the bottom of this crack!

There are hundreds of holes on the surrounding rock walls, small enough for a human to pass through, and large enough to reach forty or fifty meters in diameter, through which even a golden giant can be drilled through.

These passages seem to lead in all directions, and they have no idea where they lead, and they also cross each other, making them a huge underground labyrinth.

The rock giant that had fallen before was gone, leaving only a deep pit, apparently not knowing which hole it had entered. There were also mounds of dirt and sand around them, which seemed to have fallen from the ground and shattered the remains of mud giants and sand giants.

On the cave wall of this underground labyrinth, there are scattered fire crystals that emit brilliant light, although they are relatively sparse, they are better than the light like starlight, it is like a natural treasure cave, which looks extremely attractive.

The quality of the Fire Demon Crystal here was also much higher than the ones Li Yunfei had discovered at the beginning.

Li Yunfei carefully observed for a moment and immediately found that in the middle passage about twenty meters high, the distribution of fire demon crystals was the most concentrated and the largest number.

Obviously, this passage must lead to the main vein of this magic crystal vein!

While digging out the magic crystals on the passage and stuffing them into the space bag, Li Yunfei walked forward with joy.

According to the knowledge he had obtained from the "General History of the Mainland" and other books, the depths of the magic crystal vein were likely to be a geode, and among this geode, there was the top magic crystal!

This magic crystal, even known as the magic marrow, is a priceless treasure each!

If he could really get a magic essence, it would be of too great significance to him, because according to Li Yunfei's own plan, the next step would be to start studying alchemy, and the effect of this top-level magic crystal naturally did not need to be repeated.

This underground passage is like an endless passage, Li Yun has been flying for nearly an hour, and he has not even reached the end.

If it weren't for the glowing fire crystals on the walls of the surrounding caves, he would have wondered if this underground passage was the way to the legendary hell.

However, in this magic crystal vein, there is one person who is even more excited than Li Yunfei, and that is Xiao Jiu who sits on his shoulder.

Ever since she saw the almost endless fire demon crystals, the little girl's whole person was in a state of madness, a pair of big black eyes were almost about to emit light, and Li Yunfei had heard the sound of swallowing saliva no less than ten times!

"Chirp! Chirp!"

Every time he found a new fire magic crystal, he shouted loudly and helped Li Yunfei point out the direction. And these newly dug fire magic crystals were all held in the hands of the little girl and played with for a while, until she couldn't take them anymore, so she put them in the space bag and continued to play with the new magic crystals.

What surprised Li Yunfei a little was that the quality of the magic crystal found by this little girl was obviously much higher than what Li Yunfei found herself.

It seems that the fortune of the money fan is also good...... Turning his head to look at the little girl holding a bunch of magic crystals with shiny eyes, Li Yunfei shook his head with a smile and continued to move forward.

By the time the collected fire magic crystals had filled an entire space bag, the eyes of the two of them suddenly opened up, and they had appeared in a huge cave.

A wave of heat rushed in the face, followed by dazzling light.

Just walked out of the dim passage, Li Yunfei couldn't help but feel a little uncomfortable. When he completely adapted to the light underground, he found that the top of this "cave" gradually narrowed, shrinking into a circular exit at an unknown few hundred meters, and he could see the sky light outside.

And the place where he was standing now was a rock full of holes, and in front of this rock was a huge magma lake with an area of thousands of square meters!

Li Yunfei instantly understood that the place he was in now was the inside of a certain volcano that he had seen outside before!

No wonder there is a fire type magic crystal, it turns out to be a natural vein formed by a volcano!

Li Yunfei realized in his heart, but his excitement was even worse. On the rock beneath his feet, and on the walls of the cave around him, there were fire crystals the size of pigeon's eggs, and several of them were extremely large, almost the size of a fist.

And what moved him the most was a red stone in the middle of the magma lake in front of him. The stone, the size of a human head, stood on top of a pillar of crystal, emitting a magical burgundy glow that seemed to have liquid flowing inside.

Magical marrow!

There really is a magic marrow!

It's just that this magic marrow is located in the center of the magma lake, almost a hundred meters away from his current location, and it is extremely difficult to get it.

But Li Yunfei doesn't think about these things now. Although the magic essence is important, the high-grade fire magic crystals all over the place are also a great wealth.

In the blink of an eye, dozens of magic crystals under his feet and on the surrounding cave walls had been dug up by Li Yunfei.

"Knock...... Boom...... Knock ......" A dull sound of footsteps came, and Li Yunfei immediately looked up, only to see a rock giant walking in from the passage he came out of just now.

The rock giant limped, apparently falling from the ground and breaking a leg.

After seeing Li Yunfei, the rock giant sniffed with its rough and huge nose, and then let out a low roar like a greeting, and continued to walk forward.

At this time, Li Yunfei seemed to him, although the smell was somewhat similar to that of the sand giant, but it was definitely the same kind. As for the tweet on Li Yunfei's shoulder, he was directly ignored by the rock giant, and thought it was a tumor grown from some strange mutation.

The corners of Li Yunfei's mouth raised, and the rock giant that suddenly appeared seemed to have broken his head, looking a little stupid and stupid, and he didn't know what he wanted to do.

I saw the rock giant slowly walking in front of the magma lake, stunned, as if he didn't understand what this place was.

At that moment, the magma in the magma lake suddenly set off a red wave, and the rock giant, as if he had seen something terrifying, let out a roar similar to a warning, and turned to flee.

It's just too late!

I saw a huge crimson figure suddenly leap up from the magma lake, and instantly pounced on the rock giant's body, knocking it to the ground!

This suddenly appeared figure ten meters tall, and its whole body was composed of pieces of half-melted lava, raising flames several meters high, and it turned out to be a lava giant!

"Click!" The lava giant gnawed off the rock giant's head, and then gnawed its body in a flurry, swallowing all the bitten pieces into its stomach.

The poor rock giant had been bitten to death before he even understood what was going on!

At the same time, there were two sounds of magma surging "bang" and "bang", and two figures of the same size, with red bodies, came out of the magma on both sides of Li Yunfei and stood on both sides, looking at him with fierce eyes.

And two lava giants!

The whole body of these lava giants was burning with raging flames, and in their eyes were two huge pieces of lava with dissatisfied cracks, looking greedily at Li Yunfei in front of them.

Li Yunfei's nerves were already tense in an instant, and he gently put Jiu Jiu on the ground, holding a knife in one hand and the big wooden stick in the other, and took a step forward to block Jiu Jiu.

The first lava giant had swallowed all the rubble on the ground, including the heart of the rock, and got up and walked this way!

"Chirp, run!" Li Yunfei shouted, and the Baipi knife in his hand collided with the steel big wood, and a cloud of sparks exploded in an instant!

"Roar—" The three lava giants roared and pounced at the same time!