Not far ahead, a sinkhole appeared in front of everyone. The sinkhole was very deep, and the opening of the underground river was just in the middle of the sinkhole, and the huge water flowed down and smashed into the pool at the bottom of the sinkhole, making a deafening roar, and the sound they had heard earlier above was from here.

Geng Tongtong is also here for the first time, standing on the edge of the sinkhole, looking up curiously, through the gap between the cliff wall and vines, you can see a ray of skylight.

"Brother Jiao, come and see, you can see the blue sky from standing here!"

"Tong Tong, come back quickly, there is a group of mutant beasts over there."

Jiao Bai reminded Geng Tongtong that the gun in his hand had begun to spit out tongues of fire. Geng Tongtong's appearance alarmed a group of mutant bats resting upside down on the vines, and now these little things with red eyes all flew up and attacked Geng Tongtong.

Seeing hundreds of bats practicing together, black and pressing towards him, Geng Tongtong was also stunned for a moment, but then reacted, and a teleportation appeared not far behind Jiao Bai.

"Brother Jiao, why are there so many vampire bats here, it scares me to death."

Jiao Bai threw a gun over, Geng Tongtong's marksmanship was great, but the bullets he brought out from the base had been exhausted on the way to the storage area, and now with a gun in hand, the person was also a lot more confident, and raising the gun to shoot at the bats was a strafing shot. Wang Zhengyuan and a group of zombies also began to attack one after another, and bats were constantly hit by bullets and fell into the river, or at the bottom of the sinkhole, and the number of bats decreased at a speed that could be seen by the naked eye.

After all the way of consumption, there are not many electromagnetic rifle projectiles in Jiao Bai's hands, and now everyone is using ordinary gunpowder firearms. The dense gunfire alarmed more bats, which are creatures that rely on ultrasonic positioning to transmit information, and their ears are extremely sensitive, and they are also the most disgusted by this abnormal noise, and they enter the attack mode at the first time. From the bottom of the sinkhole, from the opposite side of the sinkhole, near the exit of the sinkhole, thousands of bats took off and pounced on the source of the sound, scorching them here.

Geng Tongtong swung out a dimensional slash, killed a vampire bat that was less than five meters close to everyone, approached Jiao Baizuo, and shouted loudly: "Brother Jiao, the situation is not right, we seem to have come to the vampire bat's nest, look at the number of thousands of them, it is not at all what our guns can resist." ”

Jiao Bai also found out that the situation was wrong, they had killed hundreds of bats, but now the number of bats attacking them has not decreased, and there is a trend of more and more. He is a little nostalgic for his army of thunderbirds at this time, dealing with bats and social creatures, or the thunder and lightning spitting of thunderbirds is the most powerful, hundreds of thunderbirds spit thunder and lightning together, and the thunderclouds formed are guaranteed to kill a large number of bats in seconds. It's a pity that when he entered the bomb shelter, because there was not enough space for activities, he left all the thunderbirds at the entrance of the cave. It is also a second-level summoned beast, and the iron-haired boar has no way to deal with a flying mutant beast like a bat, and its iron-haired shot can't reach the bat's flight height at all.

The swarm of bats grew denser, covering all the sky above the underground river. Jiao Bai and they had already turned on the burst mode, and the bullets were spilled out like money, but there were still bats that had slipped through the net and approached them and attacked. Fortunately, the city guards zombies have good fighting skills, and the bats can't get close at all when the Miao knife is wielded, Jiao Bai and Geng Tongtong have an energy shield to protect themselves, and the other has a dimensional cage to protect their lives, and they are not afraid of the attack of bats.

Jiao Bai observed the situation on the battlefield and seemed to be a little bad. More and more bats broke through the barrage, and the city guard zombies had to stop shooting and pick up the Miao knife to deal with the bats in close proximity around them. In this way, the loopholes in the barrage are larger, and more bats are close. The melee combat ability of the city guard zombies is very strong, and it seems that there is no danger in the short term, but it is difficult to say after a long time, and Jiao Bai still knows the truth that ants bite the elephant to death, and now he must think of other ways.

Jiao Bai waved his hand and took out a wheeled armored personnel carrier from his personal space, which was one of the two vehicles used in the previous hurry, "Everyone get in the car and go inside to attack." ”

Geng Tongtong, Jiao Bai, and a group of zombies covered each other while attacking and retreated into the armored car, and Wang Zhengyuan was the last to come in and close the car door with his hand. The bloodthirsty bats have no target to attack, and they have made moves on the armored vehicles, but how can they help these steel monsters, whether they tear their claws or bite their mouths, they only leave some insignificant traces on the outer armor.

Geng Tongtong removed the space cage on his body, panting, wiping the sweat on his forehead with the back of his hand, and continued to maintain the space cage and launch the dimensional slash, which consumed him very much.

"Brother Jiao, what about your iron-haired wild boars?"

Jiao Bai waved his hand and said, "Don't worry about them, they have rough skin and thick flesh, and vampire bats can't break their defenses at all." If these beasts really fly down to deal with the iron-haired wild boar, they are guaranteed to come and go. ”

"Wang Zhengyuan, you go to control the on-board machine gun, and the others shoot out from the shooting hole."

"It's sir!"

With the protection of armored vehicles, you no longer have to worry about bats getting close, you can attack with guns with confidence, and the killing efficiency has increased a lot for a while.

"Bang bang ......"

The machine gun controlled by Wang Zhengyuan also began to spit out tongues of fire, and this vehicle-mounted machine gun is a rapid-fire type that specializes in providing heavy fire support, and a single shot will cause a large area of damage to the bat swarm, and the bat corpses will fall down like rain. Occasionally, a few lucky ones did not die, but only had injured wings, and were trampled to death by the iron-haired boar waiting below.

"Kill a first-level mutant beast vampire bat and gain 1 energy point."

"Vampire bats kill a first-level mutant beast and gain 1 energy point."

"Vampire bats kill a first-level mutant beast and gain 1 energy point."

……

In Jiao Bai's mind, he intensively obtained energy prompt information, rolled upwards like swiping the screen, and the accumulated energy value continued to increase, and finally crossed the 10,000 mark after ten minutes, and the upgrade button on the system interface changed from gray to green that could be clicked. Jiao Bai tried to click,

"I'm sorry, you don't have enough understanding, please continue to fight to improve your understanding, or buy and use the barrier breaking pill upgrade in the system mall."

The prompt information of the system is ruthlessly slapped in the face, and sure enough, as a cheating party who has come all the way to Krypton, the good thing of self-promotion is not to have extravagant expectations. Jiao Bai decided, when he went to bed at night, he would buy another barrier-breaking pill to eat.

I opened the mall interface and searched for the second-level barrier breaking pill, and sure enough, I found it. The appearance is almost the same as that of the first-level barrier-breaking pill, and the effect is similar, "Increase the perception of the second-level evolutionary, break through the bottleneck, and promote to the third-level." The price has increased tenfold, and the price is 10 million. However, for Jiao Bai, who is worth hundreds of millions, this price is acceptable.