Although the underground tunnels dug by Oro and other digging worms caused two breakthroughs, the insects that rushed out could not get rid of the interference of the defenders and could not attack the human defense line from behind.

However, at this time, the long-range artillery firepower weakened, and it was no longer possible to suppress the frontal army of the Worm Puller, and the two sides had entered the stage of a fierce battle in close combat.

And this is thanks to the aerial assault of the Zermen.

The space in the small world is limited, and it is impossible to deploy fighter groups, so the Long Xiang Army can only give up air supremacy. In the face of a dense swarm of air forces, ground anti-aircraft fire can only be passively defended.

Sartula had seen before that a melee whirlwind could deal damage in a wide area and was nearly invincible. This time she was not alone, and there were plenty of friendly troops around her. After entering the artillery position, it immediately flapped its wings and spun, and within tens of meters, both machinery and creatures were twisted to pieces.

At the beginning of the decisive battle with the Feathers, it was Sartula who took the lead in rushing into the Featherman army and broke through the formation with a whirlwind, thus helping the Qila Empire defeat the main force of the Feathermen.

Princess Hahoran, on the other hand, resembles a wasp, of course, much larger than a wasp and is about the size of a fighter jet. She is good at long-range poisoning, spraying group poisonous arrows like rain, sneering and corroding when it touches objects, and the poisonous smoke will cause secondary damage.

Hunter Ayamis can attack from a distance, and will also strengthen nearby allies.

There are two main types of air forces for the Qila Worms. One is a worm man similar to Shartula, with hands, feet and wings, strong combat power, high intelligence, some can cast spells, and some are close combat; The other is the Zola Wasp, which is similar to the wasp, with long-range poison spraying, long-range spikes, melee bites, and melee and long-range attacks are very ferocious.

Another advantage of the Zerg Force is that there are many of them, and tens of thousands of elite Bugmen are only a part of it, and the most disgusting thing is the countless kinds of small bugs, like an overwhelming black cloud.

Why do locusts plague them? A single locust is weak and can be trampled to death with one foot. But when the number exceeds the threshold, any life that stands in the way of the locust swarm will be gnawed away.

And the small insects of the Qila Empire are more ferocious than the locusts, and even steel and concrete are gnawed. Their numbers also exceeded the critical value, and the key is that they are still commanded and organized.

There are so many insects that are not afraid to jump up and bite, who is not afraid?

The long-range strike force has been retracted into the fortifications, a large number of anti-aircraft fire points have been destroyed, and only the anti-aircraft guns in the core area of the fortress are protected by energy shields and can continue to output.

Thousands of rounds per minute of super-high-speed anti-aircraft guns hit the barrel hot, shot down thousands of bugs, but it was only a drop in the bucket for the rework in the sky.

On the main shield, it is densely covered with insects, and they are biting the shield with their sharp mouthparts. From a distance, it seems that the color of the shield has changed from light blue to gray-black.

The shield energy is rapidly decreasing every moment, and the staff in the energy center are constantly replacing the emptied energy crystals, but they still can't stop the energy level from dropping.

"Pooh", the energy shield finally couldn't withstand the breakage. Countless insects buzzed and flew down, their sharp mouthparts glowing with cold light, and even the sturdy special reinforced concrete fortress swore to nibble at it.

Billions of insects covered the fortified area like dust, and the rustle of gnawing made the scalp tingle.

Seeing that all the humans were reindented into the fortifications as turtles, Princess Hahoran, who was in charge of commanding the air force, looked back and wondered whether to return to the army to reinforce the forward battlefield.

At this moment, a sullen tremor came, and even Hahoran was affected, as if his internal organs had been hit so hard that his flight was unstable.

Not to mention those little bugs, which don't look like any scars on the surface, but the internal organs inside the body have completely ruptured. Tens of thousands of insect corpses rained down.

Before Hahoran could figure out what was going on, there was a shockwave, and more bugs broke their internal organs, dead or badly injured, and fell down.

This time, she sensed that the shockwave was coming from several special windows in the human fortress, and that the closer she was to the fortress, the more traumatic it caused.

Humans must have hidden some secret weapon in the fortress, but there is no way to break through the fortress now, because almost all the bugs within 500 meters of the fortress are dead.

And within 500 to 15 kilometers, the powerful insects can still withstand it, and the weak insects will fall. Farther away, it is only affected, not fatal.

If you have a little scientific knowledge, you will know that this is a sick infrasonic weapon.

The Primal Chaos Laboratory had obtained samples of its worm-pulling people for a long time, and after repeated experiments, it was confirmed that the best way to kill these insects on a large scale was infrasound. As long as the frequency is adjusted, it can only target insects, and the harm to people is minimal.

This is the advantage of human beings, not to fight against insects, but to use wisdom to develop targeted tactics and weapons.

However, due to the current technical limitations, infrasonic weapons have a limited range of action and require a huge energy supply, which can only be directly supplied by the fortress energy core.

Originally, Chu Xiongtian also planned to tug at the outer defense line for a while, and then withdraw to the main defense line of the fortress to make a big move. I didn't expect that the appetite of the insects was too big, and they dared to cross the outer defense line to besiege the core position as soon as they came up, so they naturally had to be ruthless.

After the infrasound weapon was used once, the Qila Worm people were on guard, and it was impossible to achieve such a brilliant result.

At the same time, multiple floodgates in the human fortifications opened, and thousands of troops poured out. Anti-aircraft weapons also stretched out from the firing port, sticking out tongues of fire to harvest the insects who were affected by infrasonic waves and could not fly steadily.

Several holes were also opened in the top of the fortress, and a large swarm of drones swarmed out. These drones have a wingspan of about one meter, two pairs of dragonfly-like wings, and a very small body structure, but they hold a missile larger than the fuselage.

If it weren't for the magic and all kinds of black technology today, such an airplane mechanism would not have been able to fly at all. It can fly entirely by relying on the wind rune circle on the fuselage, and the role of the wings is only to mediate the direction.

Rao is so, and the drone holding a missile is not flying fast. Only when it finds the target and activates the missile thruster will it shoot out. At this time, it is the missile that provides propulsion and the drone adjusts the direction.

When approaching the target, the drone releases the missile to disengage in order to save itself. Of course, it doesn't matter if it is bombed by mistake, the cost of the drone is not high, it is a consumable.

This drone is a reference to the Rising Sun Empire Dragonfly drone and the Insect Self-Detonating Mosquito, relying on numerical superiority to carry out saturation strikes. Unleash thousands at a time, leaving the enemy with nowhere to hide.

Boom, boom, missiles exploded one after another.

Most of the bugs in the sky that were not shot down by infrasonic waves were Qila's elite bugmen, who suffered heavy casualties under the cover of missiles. It didn't take long for the dense swarm of insects in the sky to be emptied.

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