"Boom!! ~~~Da Da Da~~" The sound of fireworks explosions echoed in a chain of piercing gunshots, and the combination of dying screams and terrifying cries from the surrounding crowd from time to time simply created a perfect 'hell chorus'! This is not an exaggeration, and the entire Dark Metropolis is gradually crumbling like a giant cake with a base that is beginning to smoke and catch fire.

"Don't come over monster~~ Go die! ~~Wow~~"All kinds of shrill roars and screams, and the sound of colliding and collapsing with surrounding buildings and vehicles synthesize a terrifying accompaniment! And the faint sound of a certain creature's body shattering in it makes most people's hearts fall into irreparable despair! It must be explained here that in the complex urban street fighting area full of various heavy firepower taboos, the alien can undoubtedly exert its maximum power like a fish in water! Experiments with captured Xenomorph samples have proven that the greatest value of Xenomorphs is not their formidable frontal combat capabilities, but their latent means of inflicting devastating blows on the enemy's vulnerable rear! The pitch-black carapace of the Xenomorphs is not only their protective color and strong defensive armor when they move at night, but also an excellent assistant when they are lurking! Under the protection of this carapace, the xenomorph will hardly emit a trace of heat and infrared rays! Without the two most commonly used means of detection, visible light and infrared, what a terrible nightmare it will be for the enemy's rear! Perhaps for some people who believe in the theory of fortification defense, the alien that lacks heavy firepower or high offensive and destructive ability can be blocked and trapped by thick fortification walls!! But they will definitely forget about one very important factor - the blood of the aliens!

The blood of these creatures contains a large number of fluorine atoms in high-tech tests, and hydrofluoric acid is the main component of their blood. Hydrofluoric acid is a formidable corrosive compound that can dissolve almost anything on Earth in the 21st century, and only objects made of fluorine compounds can resist its corrosion, such as plastics made from the polymerization of PTFE. Although in this 22nd century time and space, of course, there are some other special high-tech materials that can resist the corrosion of the yellow-green blood of the alien! But it's clear that this more expensive material obviously won't be found in most areas of this metropolis that is mixed with too much underworld scum! Therefore, after the alien decisively used his own soldier bee **** to open the way, many closed pipeline gate areas that had been pinned on hope were immediately ruthlessly pierced like corroded bee nests! With an extraordinary hunting instinct, Xenomorphs can always find the most unexpected areas to break through and bring a batch of bloody killings. The apparent lack of preparedness and fatigue of humanity for this disaster, coupled with the frenzied crowding of large numbers of fugitives, made it extremely difficult to dispatch defenses. So much so that in order to complete the blockade task, the defense forces in some areas had to kill and block all the crowds with strafing, although it did have a certain effect, but it also led to the exchange of fire among the armed elements in some areas who were armed with weapons and the opportunity to flee for their lives, thus further dispersing the deployment forces! In short, under the chaos, the ground area of the city has begun to gradually fall into chaos, and it is difficult for the gang management group with limited troops to stabilize its position even if it is suppressed by ruthless means.

The Alien Army is also obviously equipped with a different elite force than before: Mature Alien, the main combat unit! Strength, speed, and defense are all average, the earth is their home field, and one grab, two bites, and three tail swings are their main means of attack! Targeting humans, coupled with complex urban terrain, high-speed three-dimensional space movement evasion and a super physiological sensory system, they are the most efficient killers for human civilians caught in chaos! Not to mention that this time the alien also appeared as a mid-range attack unit, the Spitter! This mutant likes to keep his distance from his opponents and attacks by spitting acid blood. It does not have long, sharp teeth. In multiplayer mode, the seriously injured can explode and splash acid and blood. It's simply a combination of the Zeg Zerg saliva worm and the self-exploding bat in StarCraft, except that it can't fly! It was their horde devotion that instantly delivered a piercing blow to the guards who had deployed the defense line of the lower quarantine zone in time! Although its acid blood range is not far away, only about 20 meters away, but with the blessing of the alien's high-speed jumping and moving ability, it is enough to bring a fatal breakthrough, and many guards who hurriedly shoot are instantly corroded by the acid blood they spew, and the dying spit who is set on fire by the random bullets will also use their last strength or be used as a bomb by the same clan behind them to throw themselves at the human fortifications and explode, and the thick acid blood mist that bursts out in an instant is enough to corrode through the strongest defensive fortifications. And that's not even counting the appearance of the Crusher, a terrifying alien variant also known as the Charger, which is a class of giant xenomorphs that vary in size, but are all larger than normal xenomorphs. Unlike the streamlined and agile torsos of traditional aliens, they are more like a variant of the alien gorilla. The Smasher excels at rampage, crushing opponents with his immense strength and sturdy head. Moreover, their thick cortex also requires a lot of powerful pulse bullets to stack damage at close range to barely break through their carapace! With a super strange force, you can easily throw boulders weighing several tons into the air! Acting as a battering ram on several occasions, following closely behind the Spitter, he sped up the destruction of the human defenses.

"Bang!"

A 5-ton boulder building fragment was propelled by some kind of huge force and flew towards a heavy tank with the momentum of Mount Tai! Preliminary measurements show that the boulder flew at a maximum of more than 30 meters above the ground and reached a speed of at least 40 km/h when it hit the target! Although the armored tank that was the target relied on the ridiculously thick armor and was not smashed, the tank was completely overturned! The violent shock brought by the strong impact made the driver inside finish directly! The other alien soldiers immediately swarmed up to speed up the process of creating the Scarlet Mill, and in the chaos, more dying and unconscious creatures were dragged into the lower levels to become a new resource that continuously replenished the source of alien soldiers!

For a while, the performance of the alien army made people chill, but the foundation of the interstellar era was not bad, because these were about to collapse at the touch of a button! Large combat robots, large engineering robots, private elite guards belonging to the management chaebol...... At the moment of life and death, no one has any scruples, foam capture guns, instant sticking guns, rapid freezing guns, small magnetic blast guns...... There are also the same highly prohibited items on display, and although they can't repel the alien army, it's still okay to protect themselves with a sturdy castle. Moreover, with the condescending command of the management after withdrawing to the orbital station, a considerable number of patrol helicopter guards also joined the suppression and continued to fire ground ammunition, and the alien surface offensive immediately weakened! And with some modified anti-aircraft fire on the floors of some giant buildings, the angle of switching to the ground was immediately accompanied by the sound of huge electromagnetic cannon projectiles smashing and shattering! The alien attack that was like an ant colony just now has finally been suppressed. However, with the capture of a large number of victims by the aliens under the **** attack just now, the number of aliens will further increase in the future, if they can't be effectively improved, then there is no other way to prevent them from expanding further except for using orbital bombing or using high-powered ground-piercing weapons against the lower nest! If the alien breakthrough is allowed to spread to the real planet, then the situation is definitely not the consequence that the planet managers are willing to bear. But if strong measures are used, the metropolis will also collapse, and there are still a large number of high-value assets and classified personnel information that have not been withdrawn, in this case, how to activate the emergency bill immediately caused a heated debate at the top level, and there is also a spacecraft that has entered orbit and is secretly watching

However, at this time, Wang Bu fearlessly stood on the edge of a dilapidated high-rise building, facing an underground crack below that had been pierced by a heavy railgun, and looking at the large number of hideous alien traces lurking in the dark corners of it, he smiled and then jumped down like a suicide, rushing straight into the deep pit of the lower layer of the fracture and falling freely. People who are seen from some angles think that they are desperate madmen! But with the gravity of the abnormal blood surging in the whole body during the descent process, the whole body bones and senses surged, Wang Bu could shout from the bottom of his heart that he had been looking forward to this day since he was very young, and what kind of surprise would the alien bring him!! With the sound of his clothes tearing through the air, he fearlessly fell into the dark shadow of the crack in the deepest area of the lower level