"Where?" in the headquarters, people looked at the surveillance screen.
In the northwest of the second line of defense, a huge mutant appeared.
Its appearance is different from all known creatures and mutant creatures. Its volume is comparable to a five story building, and its whole body is full of tentacles that can wriggle and grasp.
On its back, there is a huge crack, which is full of sharp teeth!
It has no eyes, nose and other organs. In the front is a snail like antennae. These antennae do not need to touch the entity. They can detect the terrain through ultrasound. At the same time, they can also emit infrasound waves to command other variants.
Its body surface is covered with mucus, forming a protective film. Like the colloidal protective film of the sea civilization warship seen by Du Xingyu in the last world, this biological protective film can also resist the damage of explosion and laser.
Countless shells, machine guns and even missiles aimed at it failed to stop its progress.
As the level 5 mutant moved forward, its tentacles grabbed the mutant body on the ground and threw it into the big mouth on its back. Tens of thousands of small teeth in it could chew it up in a few seconds and then be digested by acid.
At the same time, a hole will appear in its head, such as a gun barrel, facing the sergeant facilities of the defense line, spraying spherical objects wrapped in biofilm.
When these spherical objects hit military equipment, they immediately burst and the acid inside exploded.
This strong acid can corrode almost everything. Even armored vehicles made of alloy will dissolve into a pile of metal and biological strong acid mixture in ten seconds!
If people touch a little, they will die instantly!
"This monster is terrible! Ignoring our attack, it can also launch biochemical bombs to attack us!" the commanders were shocked. Is this the level 5 variant? It can advance on the battlefield against lasers and bombs!
Nothing can stop it, it almost sweeps everything! And those variants killed by humans have become its energy source and its ammunition depot!
"The monster tide waited so long to attack. It was waiting for such a big killer!" Li Tai said in horror. "If it breaks through the defense line, Yunzhou base will not be protected!"
"Gather fire and stop it! Fire white phosphorus bombs and burn all the mutant bodies on the ground!"
He clearly realized that if the body of the variant was not removed, the level 5 variant could constantly repair itself and attack.
The defensive line immediately concentrated fire to block the advance of the level 5 variant, but with little effect. This guy''s mucus biological protective film also seems to be resistant to high temperature.
Du Xingyu and biochemical experts immediately began to study the grade five variant.
"According to its current performance, let''s call it the battlefield shooter." Du Xingyu casually named it and said: "there is no doubt about the defense ability of the battlefield shooter. Now it is observed that its strongest weapon is biological acid."
"When the flame encounters acid, it will evaporate into highly corrosive poisonous steam. The variant has little effect, but will affect our own operations."
"I think there are two ideal attack methods. One is biological and chemical weapon attack. The second is to send the bomb to its mouth and blow it directly from the inside!"
"Professor Du, it will take at least an hour for biological and chemical weapons to arrive. We can only use the second method!" said a military expert.
"Well," Du Xingyu nodded and said, "we have more than 100 predators left here, which can be used as bait."
The 1000 predators he brought before had been reduced by 900 just by entering the insect nest to spy on intelligence.
In the rear, Du Xingyu immediately asked people to start operation.
He broke the stomachs of ten predators, installed high explosive bombs and stitched them together.
These "biochemical bombs" were thrown into the battlefield, disguised as a member of the animal tide, and secretly approached the battlefield thrower.
At the defense line, the battlefield shooters are still moving forward.
"Our laser weapons have been destroyed!" the soldiers are still fighting on the front line, but the battlefield sprayers put too much pressure on them!
This monster that can''t move and die is a nightmare!
"If this goes on, there will be a gap here sooner or later!" the soldiers were anxious.
Different from the war with human beings, once the defense line is broken and a large number of variants pour in, it is not as simple as the battle of contention!
Variants are far more flexible than them, and then the whole line will collapse!
"Continue bombing!"
On the high wall, automatic shells are bombarding continuously.
The level five variant had noticed it. It swallowed the body of a giant elephant with a bone armour into its big mouth and made dozens of acid bombs.
"Hiss..." the acid poured on the turret like rain. The turret was immediately corroded into a big hole. The shells that had not been fired exploded in situ and the turret was destroyed!
"Request support!"
"We can''t hold it!"
"The level 5 variant is about to break through the defense line!"
"Hold on for another five minutes, the biochemical bomb is close to it!" the commander shouted on the communication channel.
"Missile aim!" in the base, the missile launching pad has aimed at the level 5 variant, waiting for the arrival of the attack time.
The predators with high explosive bombs in their bodies have approached the battlefield throwers. They follow the battlefield throwers to rush to the human position and pretend to be a member of the animal tide.
"The biological computer self destruction program starts!" Du Xingyu remotely destroys their biochemical brains, so that the predators will die on the spot.
Two predators died next to the battlefield thrower, unaware that it was a human made biological weapon.
Several tentacles put their bodies into the big mouth for chewing and digestion.
"Boom!" the high explosive bomb exploded in its body, exploding countless visceral fragments and acid.
"Zi ah..." the battlefield shooter began to twitch violently. Sure enough, the bomb detonated from the inside caused great damage to it.
But it''s not fatal!
"Missile launch!"
At the same time, five missiles were positioned by radar and aimed at the battlefield shooter.
At this time, it was still seriously injured and could not defend against so many missiles.
"Collapse!" there was a sound like the collapse of heaven and earth on the battlefield. Black smoke filled the front of the whole defense line and was cleared out of an open space.
The level 5 variant battlefield shooter has been blown apart! You can''t die anymore!
"Blow it up!"
"Brothers, do it!"
"The reinforcements have arrived. Repair the defense line quickly!"
"Continue to attack!" the soldiers shouted. Seeing that the mutant was killed, they rekindled their fighting spirit.
"Finally, it blew up!" Li Tai and others breathed a sigh of relief. "In order to kill it, we used enough weapons to destroy an armored force!"
"It''s not over yet!" Du Xingyu''s expression was still cautious.
"What''s the matter?" the crowd looked at him.
"There can''t be only one level 5 variant!" Du Xingyu manipulated the computer, adjusted it to a specific picture and said, "look!"
The crowd looked intently and saw three more battlefield shooters behind the animal tide!
In addition to the battlefield throwers, there are also level five variants in the sky.
It''s a huge bird that humans have never seen before, or it''s not too much to call it a flying dragon!
It has a wingspan of tens of meters, a huge head and a long tail.
Under the attack of fighter and air defense system, it can keep avoiding and defending, and easily destroy fighter!
The most terrible thing is that it also has biological and chemical weapons. Its chirp is an extremely destructive infrasound wave, which can penetrate the defense equipment and directly destroy the viscera of the fighter pilot!
Some fighter pilots who could not escape died directly in the cockpit, and the fighter also crashed!
On the ground inside the second layer of defense, the concrete ground suddenly broke. A huge underground worm without a head, like a cow''s large intestine, drilled out, and it hit a turret. Before the soldiers could defend, it went underground and disappeared.
"So many level 5 variants! And animal tide!" the commanders turned pale. How should we fight this battle?
"We can only wait!" Du Xingyu understood that it was difficult to reverse the situation by relying on thermal weapons.
"Do you want to use nuclear weapons? But the variants have invaded the inner side, launch nuclear weapons, and most of the whole Yunzhou base will be destroyed."
There are nuclear shelters under Yunzhou base, but even these shelters cannot absolutely defend against nuclear weapons.
"How long will biological and chemical weapons remain?" Du Xingyu contacted the transportation officer.
"Half an hour!" replied the transportation pipe.
"Half an hour." Du Xingyu said, "the second layer of defense continues to insist, including the third layer of defense. It''s really not good. You can even retreat to the base city!"
"Let mutants rush into the city and fight in the street?" Li Tai asked. Human beings and mutants will almost lose in the urban street war!
"That''s the worst case," said Du Xingyu. "Everybody, you continue to command. I want to study the new level five variants at these two ends."
He continued to collect data for analysis.
Battlefield shooters can sneak into it in the old way, and Du Xingyu named it "sonic pterosaur" for the level 5 variant in the sky, which is characterized by the ability to emit infrasound waves.
And because it can be detected by sound waves, only supersonic weapons can hit it.
"Use laser weapons! The speed of laser can''t hide acoustic pterosaurs. Lure them with drones, and then attack them with laser!" Du Xingyu summoned him.
At the other end of the earth, there are five level variants, which Du Xingyu calls "stalkers". It has not yet demonstrated its biological and chemical weapon function, but the attack from underground is definitely a point that mankind can''t cope with.
Moreover, it will pose a threat to the lives of ordinary people in the underground protection center. We must kill it!
While Du Xingyu was thinking, the stalker destroyed several turrets.
"Hmm? This guy seems to be very sensitive to thermal energy?" Du Xingyu noticed a detail. The stalker has no vision of the ground and will not emit infrasound waves. Its perception should be a kind of thermal perception. If something with high thermal energy is used, it should be able to attract its attention.