Communicators, the most common means of communication in this world, but that thing is relatively advanced, Fang Yan is reluctant to waste materials to spend time refining, each piece of communicator is like a telegraph message, it can only carry a small amount of information, and it can only be used once.

To refine a communication talisman, you must first have the level of a sixth-level refiner before you can barely refine it, and every communication talisman can be transmitted thousands of miles away, and it is generally the military or big forces that can afford to use this thing.

A communication talisman is composed of at least two, and the minimum in itself is a seventh-level magic weapon, and the materials required are all precious spiritual materials, the more information transmitted, the more huge the spiritual energy required, and it will be gone after one use, it is completely a matter of burning money, basically at least 100,000 spirit stones will be burned at a time, and ordinary people can't afford to use it at all.

After Fang Yan simplified the processing, the refined communicator could not be passed on a word, but through the agreement, he could use the communicator to summon companions. Even so, Fang Fengbao was extremely distressed, and the thirty thousand spirit stones were gone.

On the other side, the communication charm on Feng Yu's waist suddenly shook and turned into flying ashes and dissipated.

"It's not good, Fengbao is in a hurry, it seems that something is wrong, let's go back quickly." Feng Yu said as he spoke, the person had already rushed out first, and Lin Feng naturally knew this and chased after him.

When the two of them rushed back to the cave, Senior Sister Hu pointed to the depths of the cave and said, "There are a lot of barbarians over there, and they are about to come over, so you hurry up and help Fengbao and delay as much time as possible." ”

The two paused for a moment, Lin Feng handed a communication charm to Senior Sister Hu, looked inside the cave, made sure there was no movement, and hurriedly chased into the depths of the cave.

By the time the two arrived, the barbarians in the cave were chasing something, but they were not familiar with the tunnel, like headless flies.

The two of them hid in the dark, exploring the situation of the barbarians, and turned a tunnel, Fang Fengbao suddenly fell from the hole above, beckoning the two to enter the tunnel.

"There's only one floor on the upper floor, and three floors below, leading them underground. Fang Fengbao said as he came to the end of a mine cave and jumped down towards the hole.

Lin Feng followed beside him and said, "There are too many people, and we are not familiar with it below, could it be too close to the Earth Dragon?"

Fang Fengbao said: "I can't care so much, it's all at this juncture, and I can only take one step at a time, and delay time first." ”

After the three of them drilled into the basement floor, they soon encountered the barbarians on this floor, and the three of them deliberately contained the barbarians, and after they met, they immediately started to kill the barbarians with the strongest attack.

With the dragon scale armor to protect themselves, the three of them don't need to care about the attack of the barbarians, they just kill the enemy with all their might, even if they are bald, they can't break through the dragon scale armor defense, and the three of them naturally have no scruples.

There was a burst of swords and swords, and the barbarians shouted and killed up and down, but in a moment, seven or eight barbarians fell, but around the mine, more barbarians gathered.

The three of them were like entering a no-man's land, swords flying, and they kept fighting in the barbarian surrounding, one by one the barbarians fell down one by one, and more barbarians surrounded them, which reduced the space, and the three of them were also restricted, some tricks were not easy to use again, but fortunately, the three of them had been on the battlefield, knew how to kill the enemy on the battlefield, and they had honed some basic simple killing tricks, and they could still persevere.

Just like the second encounter in the Taiwu Secret Realm, a large number of barbarians rushed up, and after rushing away from the three people, they surrounded the three of them like a swarm of ants, although they could not break the dragon scale armor defense, but the barbarians could limit the hands and feet of the three people, so that they could no longer move.

"Boom" dense lightning burst out from Fang Fengbao's body, spreading in an instant, sweeping the surrounding barbarians, and the powerful current electronized all the barbarians next to each other.

Thunder is still very mysterious and powerful in the eyes of people in this world, but Fang Yan has the cognition of his previous life, so he naturally knows what thunder and lightning are, and the strongest thing in this thing is voltage, with the same energy, the voltage will increase thousands of times, and the power will also increase.

With high-intensity voltage and current, even if it is a master of Wuzun, he will suffer a big loss in the case of being caught off guard. After learning about the refining method of thunderbolt beads and understanding its principle, Fang Yan naturally had to combine his own theory and ask Zhi Brain to help modify and improve it.

Thunderbolt beads are like batteries, but some differences are that batteries use the principle of chemical reaction to store electricity, of course, there are also capacitor methods, generally speaking, the method of capacitor storage is more explosive.

The original principle of the thunderbolt bead was to use the magic array rune to instantly convert the aura stored in it into electricity and release it.

After Fang Yan was changed, he combined the power of the rune array with the capacitance theory and asked the Zhi Brain to help recalculate, the power of the thunderbolt bead was directly increased by a hundred times, and a million volts of voltage were released in an instant, and the strength of the martial arts level could not be stopped, and he would be unconscious in an instant.

Although the current is reduced due to the increase in voltage, and hundreds of barbarians gather together, and after sharing, the power decreases, but those barbarians who are closest are naturally the most unlucky.

Under the influence of the electric current, all the barbarians who got close to them convulsed, and those who were a little farther away would also feel paralyzed and unable to control their bodies.

The instantaneous changes on the battlefield were enough to influence the situation of the battle, Fang Fengbao broke free from the barbarian encirclement, the dragon slaying knife waved, and the necks of the six barbarians around him were cut off in half. Fang Fengbao took the opportunity to jump up and slash the barbarians with a knife.

When the dragon slayer knife was waved in his hand, there was a hint of weightlifting, and every time the knife was swung, it happened to be able to kill and injure barbarians, and it would not waste too much force, almost just right.

Saving strength, that is a necessary condition on the battlefield, Fang Fengbao was freed, and immediately freed Lin Feng and Feng Yu as well.

The three of them joined forces, next to each other, against the barbarians.

After all, the mine was too small, and the barbarians gathered in an endless stream, and soon blocked the mine, and the three of them were limited by space, and they could only fight in the crowd.

The barbarians kept gathering, and there were more and more people, and the three of them could only choose to evacuate, and finally escaped from the barbarian encirclement, and then escaped into the tunnel.

"There are too many people, the space in the mine is too small, we can't play at all, but we will be surrounded by it, which is not the way. Lin Feng looked aggrieved, obviously relying on his own advantages, he could slash and kill the barbarians like vegetable melons, but he didn't want to be limited by the environment, but he was surrounded, he couldn't give full play to his advantages, and finally had to flee.

Fang Fengbao sighed and said, "Even if the dragon scale armor is raised, the barbarians are not dark creatures after all, the gap between us is not as big as imagined, and now we can only go to the second underground layer." ”

Feng Yu looked around and said, "Further down, how do I feel like I'm on the same floor as the Earth Dragon." ”

Lin Feng smiled bitterly: "It's useless to think so much now, it's the same ending on the left and right." ”

Feng Yu shook his head helplessly and sighed, and the three of them set off again.

Taking advantage of the geographical environment, the three of them unexpectedly attacked the barbarians, and with one blow, they immediately retreated, without staying for a moment, leading the barbarians to chase the three of them towards the entrance to the second underground floor.

The barbarians did not disappoint the three of them, chasing after them, and soon found the entrance to the second basement floor, and then they were tricked into it, making the troops even more dispersed.

With the help of the geographical environment, the three of them encroached on the barbarians' strength little by little, and the second and third underground floors were exposed to the barbarians, allowing more barbarians to divide their troops into it, and the troops were more and more dispersed.

"How did it come to an end?" As soon as the three of them returned to the third underground floor, Feng Yu found that this layer of tunnels seemed to be at an end.

Fang Fengbao explained: "With the load-bearing requirements, we can't really dig this mountainside like an anthill, otherwise it will easily collapse." There is also a road to the fourth floor, which can be drilled from below to the other side. ”

Feng Yu stopped: "Don't, don't let the barbarians know about the fourth layer for the time being, we still have to consider leaving, this fourth layer may be the way to leave." ”

Fang Fengbao shook his head and said: "Impossible, the barbarians have found this third layer, so many people have been sent down, and there are several entrances to the fourth layer, it is impossible for them not to find it." ”

The three of them turned left and right in the tunnel, and Lin Feng asked, "After turning around for so long, I'm confused, Feng Bao, how far are we from Fang Yan here?"

"Five miles at most. Fang Fengbao stopped and said with a solemn expression. "I've forgotten about this, it seems that we have to lure the barbarians a few levels underground, and we can't let them go any further. ”

Feng Yu sighed and said, "Let's go, lead them to the fourth layer." ”

The three of them are also helpless, four or five miles away, it is too close, even if the barbarians need to explore the road of the cave, it is impossible to find the direction directly, but they can't stop Fang Yan from refining in the cave, even if the aura fluctuation is blocked by the cave, Senior Sister Hu guards and prohibits it, but it can't completely block the leakage of this aura fluctuation.

The closer the distance, the higher the skill, the more they can sense the subtle difference from it, at most three miles, the bald person can definitely sense the aura fluctuations.

With the lighthouse-like guidance of aura fluctuations, even barbarians who don't know the way can easily find the cave through this guidance, which the three of them will never allow.

The fourth layer is very different from the third layer, this layer is very different, one by one the holes go straight down, like a bottomless pit, if you really want to drill into it, most of them have to climb up again, and only a few holes are figured out.

Each hole is at least hundreds of meters deep, not to mention that it is extremely troublesome to go down and come up, the most pit is that these holes are turning, and there will be a turn when you go down dozens of meters, and there is no law at all.

After the three of them introduced the barbarians into the fourth layer in the old way, the three of them got into a hole in the ground, and Lin Feng couldn't help asking: "Feng Bao, there are too many holes in the ground, won't they dig through the lungs and draw out the poisonous fire of the lungs, right?"

Fang Fengbao shook his head and said: "I just have to follow the sandworm mining machine, how can I know these things, but what you said is very likely, after all, there is a lung poison fire in the cave, and it stands to reason that this place is deeper than that side." ”