Ye Fei stayed on the third layer of the cave for more than an hour, and finally walked through most of the rocks. The rocks here can be roughly divided into four types, one is dark red and has very little damage, only about ten points, one is red and can cause about 30 points of damage, and the red rock that burned him out of the stealth state before can cause about sixty points of damage.

Of these three types of rocks, he could avoid all damage after drinking a bottle of fire-based secret method resistance potion, but the fourth type of very rare rock could not be touched. This kind of rock may no longer be called a rock but a spar, it is translucent fiery red, from time to time there are sparks drifting, occasionally there will be flames jumping out, and there are a very small part of this spar, there is already a red liquid like a stream of water flowing inside, this liquid is very rare, basically a huge spar two meters high inside, there is a fist-sized liquid.

What made Ye Fei even more devastated was that this kind of thing could actually be collected.

Huo Yan Crystal, when Ye Fei inadvertently used the miner's identification, he found out that this thing was actually a very rare ore - Huo Yan Crystal.

What Huo Yanjing is, Ye Fei didn't know, because he had never heard of it, but it was precisely because he had never seen or heard of it that it was precious. Tungsten iron and silver ore are already precious, right? But there are still a large number of ore veins, their prices are high, but because the guards of Most City have controlled them, but these fire flame crystals are really rare, Ye Fei has traveled to most places on the third layer, and the fire flame crystals he has seen are only a dozen places, some are big and some are small, and the larger ones are like huge stones two or three meters high, but there are only two such large fire flame crystals, all of which are at the core of the third layer, and most of the fire flame crystals are the size of a football, or slightly larger.

Ye Fei had tried to mine a piece of Fire Flame Crystal that had no monsters nearby, and as soon as he got close to this Fire Flame Crystal, a flame jumped out and gave him nearly fifty points of damage, burning him out of his stealth state. However, when his mining skill fell on the flame crystal, the system prompted that the mining skill was not enough, and he needed an intermediate mining skill to collect it. It's a pity that since the follower system was opened, he basically hired NPCs to mine for himself, and his mining skills have basically not improved.

"Hey, it's a pity!"

Ye Fei could only look at these flame crystals and secretly regret them. Although Chen Hao and the others must have intermediate miners there, how difficult is it to go deep into the third layer? Not to mention that there are so many remnants of the underground race in the second layer, even if you can successfully reach the third layer, the fire crystal will cause fire damage to the miners. For thin-blooded life pro players, it doesn't take a few hits to kill them, not to mention mining, and it's good to be able to survive here.

With such regret, Ye Fei entered the fourth layer of the Thousand Rock Cave.

There are many high-level underground races in the third layer of the Thousand Rock Cave, these guys are either above fifty or sixty, or elite, in the face of this kind of enemy, Ye Fei has no choice but to carefully avoid them.

The entrance to the fourth floor was carved out of a nondescript stone wall, the entrance was not large, and the entrance was guarded by two elite minotaurs of no lower rank.

Normally, these elite monsters are a small group of underground races that resemble bosses, but here, these two elites are actually only acting as guards. This made Ye Fei wonder: "Could it be that this is where the boss lives?" ”

He sneaked up near the Minotaur, but as soon as he got close to the two of them three meters away, they immediately looked over vigilantly.

"Rub, vigilance is so high!" Ye Fei was a little depressed, knowing that the level difference between the two sides was too much, which caused the effect of stealth to weaken. He thought for a moment, threw out an ice bomb, and at the same time stabbed a shadow in the back of the minotaur, and then his body flashed, and he used the sprinting potion to rush towards the cave.

Although the two bull-headed elites let out an angry roar, but under the influence of the ice bomb, their speed was greatly reduced, and after Ye Fei escaped more than three meters, he immediately used the disappear, disappeared into the smoke with a bang, and quickly entered the fourth layer.

However, the two bullheads did not retreat back to the cave as he expected, but quickly ran into the fourth floor and shouted: "There is an enemy invasion, everyone is on alert, and a Terran assassin has broken in." ”

Suddenly, there was a shout and scolding all around, and teams of miscellaneous soldiers of the underground race rushed out from all corners, responsible for guarding, and nervously patrolling around.

Ye Fei, who was hiding in a dark place, looked at the scene in front of him dumbfounded, the fourth layer of the Thousand Rock Cave was not a cave at all, but such a huge basin!

In the sky, the setting sun shines with a dull yellow light, giving this strange world a layer of sunset color. On the towering trees, occasionally a few huge strange birds will pass by, and the withered yellow leaves will slowly fall to the roof of the simple wooden shed. These wooden sheds are not houses at all, they are simply built with a few logs leaning on large trees. Simple houses, with roads paved with a third layer of rock, form a small herd tribe.

On these stones, there are children and teenagers of all races running barefoot, making all kinds of different calls, cheering and crying, and their people also include children of all races, bullheads, half-snake people, goblins, and so on. It was only when the two minotaurs came in to warn them that they were brought back by the slightly frightened adults, and instead a motley army came out to patrol the tribe.

Looking at this scene in front of him, Ye Fei's heart suddenly moved, could it be that the remnants of these underground races moved here thirty years ago, and then multiplied and stayed until now. Looking at their appearance, although many of them are wrapped in the most primitive animal skins and grass skirts, and the armor on many of them has been rusted, there is no doubt that their combat effectiveness is very strong. Even, in the past thirty years, they have not forgotten to train, because he found that those who were originally wearing grass skirts have changed into leather armor and armor after learning that someone has invaded, and they have made a preparation for battle.

"Sure enough, in adversity, it will become stronger."

These underground races are always vigilant against the danger of being found by the Terrans, so they are not training all the time, so their strength has not been put down for a day. On the contrary, whether it is the city guard or the expeditionary force in Moster City, once the thirty years of peace have passed, the sharpness has worn out a lot, and many people are now young people who have newly enlisted in the army, and their combat experience is almost zero, in comparison, the gang of people of the underground race is even more powerful.

Now, the entire race is roaming inside and outside the underground race, and Ye Fei can't even if he wants to enter. Moreover, there is nothing in this place that is worth his stay here. He was about to exit the fourth floor, when suddenly a figure suddenly appeared on a large tree in front of him.

The archer wrapped in the cloak appeared so suddenly, he pulled out the bow and shot towards Ye Fei, and the rich death power filled the body of the arrow, which made people frightened.

Ye Fei was suddenly startled in his heart, knowing that the sneak had been detected by someone, so he hurriedly dodged and hid behind a rock, but the arrow light followed like an eye, and with a bang, the rock was blown to pieces. The debris of the stones slapped on Ye Fei's body, causing a lot of damage, and forcefully knocking him out of the sneak.

"Nima, don't play like this."

Ye Fei had just used it once, and it was still cooling down at this time, and this exposure immediately aroused the vigilance of the nearby monsters, and they rushed over with the weapons in their hands, Ye Fei gritted his teeth, and was about to use the teleportation scroll given to him by Luo Ka to escape from here, but he didn't expect the undead archers on the big tree to speak: "Stop, no one can hurt him without my permission!" ”

The half-orcs and the undead door who had already rushed in front of Ye Fei stopped, but the weapons in their hands were still pointing at Ye Fei, and they looked at the undead archers suspiciously, not understanding what he meant.

Behind Ye Fei's back, the werewolf assassin Syphus slowly lifted his stealth state, and he looked at the undead archers in the trees with dissatisfaction. In just a second, he would be able to slash the human's neck with a blade and brutally ravage him to death, but now, this guy actually said that he was not allowed to hurt him? What is the reason, the undead and the humans, that are the eternal mortal enemies!

Sieverus moved slightly, and there was an impulse in his heart to disobey the order of the one and pierce the human heart. Chieftain? Yes, he is indeed the new leader, but he has only been the leader for a few days, and he doesn't understand that the previous leader will give such an important position to this young undead!

He glanced at Ye Fei's neck, his gaze moved down slightly, and he stared at his heart twice, he even gestured at the weapon in his hand, thinking about how to make the other party feel the greatest pain and not die so quickly.

Ye Fei only felt a chill in his back heart, although he couldn't see the person behind him, he could feel the strong murderous aura behind him. This murderous aura was so close to him, it was obvious that he had already sneaked over, but before that, he had not noticed any sign of anyone approaching.

The only explanation is that the guy behind him hides his aura very well, and he doesn't even leak out a little bit of murderous energy, this is a master.

Ye Fei originally thought that he was going to die, surrounded by so many people, I am afraid that he would not even have time to tear up the scroll and escape, right? That scroll, but it takes more than a second for it to take effect and teleport people out.

However, the hoarse voice of the undead archer gave him a glimmer of hope, this voice was somewhat familiar, could it be John?

Ye Fei thought so, and then despised himself, how strong was John when he left? It's just more than 20 levels, how can it become so powerful all of a sudden? Moreover, it seems that the other party still has such a low position in this place where the underground race lives, if it is other undead, it would be fine, but John is a complete newborn undead, and it can't be the heir of a certain undead bigwig - if the undead can also have children!

Just as Ye Fei hesitated to say something, the undead archer shot out another arrow, but this time, Ye Fei could see very clearly that the arrow was a little away from him, and it should have been shot towards the person behind him.

Sure enough, Seapheus behind him snorted angrily, swung his dagger to pick the arrow away, and glared at the undead archer!

The undead archer, as if he hadn't seen his eyes, said indifferently, "Bring this human to my room." No one can touch him without my orders, Siphus, you'd better be restrained! ”

Sieverus glared at the undead archer fiercely, and finally lowered his head helplessly and answered: "Obey, my lord!" ”