The giant insect demon that climbed out of the demon cave saw a large quantity of delicious food on the nearby wall, and it opened its mouth, which split into four parts filled with sharp teeth, emitting an excited cry.

The brown shell on its back trembled twice, and the wings inside, as thin as a cicada's wings, opened.

The wings fluttered, and the giant insect demon's figure crossed thousands of meters to arrive in front of the wall. The automatic weapons placed on the wall scanned the giant insect demon's figure, automatically activated, and a barrage of bullets poured out.

But the vast majority of bullets were brushed aside by the giant insect demon, with only a few hitting its body, merely sparking a few inconspicuous bursts, completely failing to achieve the expected effect of the machine-gun fire.

The soldiers on the wall were horrified, feeling immense pressure in their hearts, yet they did not retreat a single step. The special symbolic garments on their bodies were also functioning, emitting warmth to block all the demonic aura outside.

"Leave this to us, you handle clearing the small demons trying to break through the defense line."

A voice came from the sky, several figures in military uniforms flew out, and several powerful streams of Spiritual Power merged into one. Under the leader's control, the Spiritual Power of each person transformed into a powerful attack.

Boom! The giant insect demon was repelled by the combined efforts of the few.

"Is this the military formation?"

Lu Yu watched as several Martial Cultivators who had just entered the Qi Sea Realm teamed up to repel the giant insect demon, which had strength equivalent to the sixth level of the Qi Sea Realm, feeling somewhat surprised.

This was the first time he personally witnessed the power of a military formation.

A military formation allows the power of all individuals to be concentrated into one, achieving a qualitative change through quantity.

As long as the commander's control ability is strong enough, theoretically, the more people participating in the combined attack, the better.

Lu Yu also began to understand why Celestial Wind Academy recruits at the minimum realm of Qi Control Realm.

The military formation attack requires external Spiritual Power, and only when a Martial Cultivator extrudes his Spiritual Power can the commanding officer of the military formation converge this force into a combined attack.

Glancing at the repelled giant insect demon, Lu Yu estimated in his heart that perhaps these several people could block the giant insect demon, but it would be very difficult to kill it.

After all, the difference in strength between the two sides is too great. Just being able to repel the giant insect demon through the military formation is already extraordinarily remarkable.

The giant insect demon's assault on the wall was intercepted, and those cockroach demons as large as fists and heads emerging from underground swarmed into the demon cave.

When they emerged again from the fleshy holes of the demon cave, their sizes had all increased to over a meter tall, their forms had undergone massive changes, with more weapons on their bodies, more adapted for combat, almost no longer retaining cockroach characteristics.

Numerous six-armed blade demons already transformed by the demon cave strode swiftly towards the wall. The newly formed demon cave needs a large amount of food, and the humans on the wall, outside the wall, and in the city are the best food.

"Open Fire!"

The automatic weapons had already turned their muzzles, pouring out a metal storm on the charging demons below. Bullets swept through the demons, shattering their bodies into pieces, flesh and blood flying everywhere.

The first wave of demons attacking the wall was directly crushed by automated weapons, but they were not completely dead; the meat on the ground kept wriggling.

On the battlefield covered with flesh and blood, the pieces of shattered meat wriggled and actively consolidated in one direction.

The soldiers witnessing this scene couldn't help but feel their skin crawl, chills traveling from their feet to their heads. Although they knew of the demons' immortality, seeing already shattered flesh still move made their scalps tingle.

Aside from a few parts that were completely physically crushed and burned to char by flames, most of the demon flesh retained activity. When wriggling together, they formed fused entities and charged towards the wall once more.

"Incendiary bombs, fire!"

The charging demons collapsed again, not waiting for them to fuse again. Incendiary bombs fell from the sky, turning the ground into a hell of flames, struggling flesh and blood in the flames were soon reduced to charcoal, completely losing vitality.

Watching the demons firmly held a hundred meters away by the military, Lu Yu couldn't help but marvel at the power of technological weaponry, yet there was no trace of relief on his face.

Incendiary bombs are effective against these weaker demons, but against higher-level demons, their effectiveness is minimal.

The first time Lu Yu went abroad, he encountered the fused demon "Abomination," and although its power was just at the entrance level of the Qi Control Realm of a Martial Cultivator, its strong regenerative ability and formidable defenses.

Were enough to resist the flames of incendiary bombs.

When incendiary bombs lose their effectiveness, the difficulty for the military to deal physically with the demons' immortal bodies will increase sharply.

A three-meter-tall six-armed blade demon was ejected by the demon cave with a puff~. This tall six-armed blade demon charged towards the wall, and its charge direction was precisely where Lu Yu was.

The demon cave sensed this place had the most food, so this was its main attack direction.

Similarly, with Blue Sea City backing it, the most intense firepower from the military was also here.

The three-meter tall six-armed blade demon quickly navigated the battlefield filled with cannon fire, dodging most bullets. Those few bullets that could hit it couldn't shatter its body, only leaving large bowl-sized wounds.

It accomplished what others of its kind couldn't, breaking through the hundred-meter firepower blockade line and charging towards the people on the wall.

With its speed, crossing the hundred-meter range would only take one second.

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