With Tang Yinmeng clearing the path, everyone continued on toward the third defensive line.

Right at this moment, a total of 12 special soul aircrafts appeared on the battlefield in the distance, escorted by over 300 more conventional soul aircrafts.

Even the powerful beings of the Battle God Hall had never seen this type of soul aircraft appear on a battlefield, let alone those from the Tang Sect and the Spirit Pagoda.

In reality, the vast majority of the Western Legion, Northwestern Legion, and Southern Legion's troops were also completely in the dark.

In contrast with the normal aerodynamic soul aircrafts, these ones appeared to be quite bulky and clumsy.

Not only were they over five times the size of a conventional soul aircraft, their bellies were extremely rotund, and there was what appeared to be a massive dome sitting on top of each of them, presenting a very peculiar sight to behold.

What were those things? Were these new weapons recently developed by the federation.

As soon as Wu Zhangkong caught sight of those aircrafts, he immediately changed his mind. "We don't need to go there anymore; let's reinforce the Battle God Hall."

Right as he made this decision, the 12 strange aircrafts began to display their power, and a faint buzzing sound rang out on the battlefield.

The buzzing wasn't very loud at all, and unless one paid special attention to it or was particularly sensitive, they wouldn't even be able to notice it over the sound of the incessant artillery explosions.

The abyssal creatures naturally didn't notice this, either, nor did they feel anything special.

Many flying abyssal creatures, including Abyssal Bomber Hornets, were already swarming toward the cluster of aircrafts, but these 300 soul aircrafts were all that the Central Legion had left, and their combined artillery output was able to keep even the Abyssal Bomber Hornets at bay.

In the next instant, the Abyssal Bomber Hornets, which were the weakest individually, began to display a reaction to the faint buzzing sound.

First, they began to tremble uncontrollably while flying at high speed, and this immediately made their formation slightly chaotic and scrambled.

In the next instant, one Abyssal Bomber Hornets after another suddenly split open from the abdomen before disintegrating into abyssal energy.

This was different from Tang Yinmeng using soundwaves to detonate them; it was as if the Abyssal Bomber Hornets' internal organs had decayed, thereby leading to their deaths.

Initially, this was only happening to a few Abyssal Bomber Hornets, but within the span of just a few breathes, Abyssal Bomber Hornets carcasses began to fall like rain, disintegrating into abyssal energy during their descent.

The Hornet Sovereign, who was currently controlling all of her brethren, was immediately struck by incessant waves of feebleness, causing her aura to be significantly debilitated. This naturally came as quite a shock to her.

Each and every Abyssal Bomber Hornet was like a part of her body. With her ultra-powerful control abilities, each one of her compound eyes could control a huge number of Abyssal Bomber Hornets.

Deaths up to a certain number were completely inconsequential as the Abyssal Bomber Hornets would quickly resurrect in the abyssal plane and replenish the lost numbers.

However, if too many of these hornets were to perish, then the Hornet Sovereign would suffer from backlash.

In this short span of time, over a third of the Abyssal Bomber Hornets had already perished; that amounted to a number in the millions!

Even all of the artillery that came before this combined hadn't inflicted such severe losses on the Abyssal Bomber Hornets.

The Hornet Sovereign hurriedly issued an instruction for the Abyssal Bomber Hornets to retreat, and by the time they retreated into the distance, less than half of the Abyssal Bomber Hornets remained.

Meanwhile, the 12 strange aircrafts had already dispersed and were escorted by the other soul aircrafts toward the third defensive line, which was currently under attack from the abyssal army.

The buzzing sound became noticeably louder, and the abyssal creatures down below were instantly thrown into disarray.

Initially, they were only struck by feelings of frustration and anxiety, but soon, the condition of some of the abyssal creatures began to rapidly deteriorate. After that, their abdomens also began to split open as had happened to the Abyssal Bomber Hornets, and liquids of different colors flowed out of their bodies as they perished and disintegrated into abyssal energy.

This was happening to huge sections of the abyssal army, and the pressure on the third defensive line was instantly eased significantly.

The weapons being used here were infrasonic weapons, one of the newest types of weapons developed by the federation, and it was ranked alongside the heavy ion laser as the two most cutting-edge pieces of warfare technology.

What made infrasonic weapons so dangerous was that their attacks covered extremely large areas, and they killed enemies by triggering resonance on a special frequency.

Furthermore, infrasonic weapons didn't destroy the environment as nothing would be affected as long as they weren't on that special frequency, so humans were safe from such weapons as well.

It was clear that the soundwave frequency the 12 aircrafts had been switched to were designed to target different types of abyssal creatures. To put it more accurately, it was to target abyssal energy.

Abyssal energy was an extremely special form of energy, and humans had been studying it for thousands of years. The Blood God Legion wasn't just guarding the abyssal passageway; it had also provided a lot of information and samples for human research toward the abyss.

Infrasonic weapons hadn't been developed just to target abyssal creatures; they could target any type of living being, and they were being touted as an important weapon for future space exploration.

Only in the past few years was initial success achieved on this project, and these 12 infrasonic aircrafts were the first batch of prototypes.

Infrasonic weapons were extremely powerful, but they also had many downsides, including their bulky size and lack of defensive capabilities, which meant that they had to be protected by large numbers of troops at all times. Thus, there were no plans to mass-produce these weapons at the moment.

In fact, they hadn't even been held in as high a regard as the heavy ion laser weapons, but as it turned out, they were far more useful than heavy ion laser weapons on this battlefield. After decimating a huge number of abyssal creatures, the crisis of the third defensive line was temporarily averted.

One Abyssal Spirit Dragon screech after another rang out across the battlefield as they attempted to use their own spiritual power to create soundwave vibrations to resist the infrasonic weapons' attacks.

Even though they weren't able to completely nullify the infrasonic weapons, this was at least enough to ensure their survival.

At this point, Wu Zhangkong and the others had already descended onto the mountaintop. There wasn't a single Limit Douluo in the group, but all of them were wearing complete or incomplete suits of four-word battle armor. As soon as they arrived on the battlefield, the pressure on the Battle Gods was lessened significantly.

"Make sure to protect Xiaoyao, and let's go kill those three big lizards," Wu Zhangkong said as he pointed his Skyfrost Sword in the direction of the three Abyssal Spirit Dragon Kings.

The 10 of them instantly changed formations with Sima Jinchi, Yuanen Yehui, and Yue Zhengyu at the front, Wu Zhangkong and Lan Muzi just behind them, and everyone else bringing up the rear while Xu Xiaoyan was situated at the very center.

Xu Xiaoyan had already proven her worth as an exceptional control system Soul Master on many occasions, and the most fearsome aspect of her soul skills was their absolute nature.

There was virtually no chance of her soul skills failing, and only through her control did they have a chance to completely destroy the three Abyssal Spirit Dragon, which possessed immense spiritual power and combat prowess almost on par with Limit Douluos.

Without the three Abyssal Spirit Dragon Kings overseeing the battlefield, the enemies would undoubtedly become significantly weaker, and with the infrasonic weapons causing mass-destruction, the situation on the battlefield would be stabilized.

...... 

On the Arctic Ocean.

Just like the clash on the main battlefield, the battle at sea had also reached white-hot intensity.

The enormous purplish-black back had appeared on the surface of the sea again, while two warships and over 10 medium and small battleships were already lying in the final resting place at the bottom of the sea.

The gigantic whale rushed forward again, and it was extraordinarily fast. The three naval fleets were already extremely careful with their defenses, but they were still unable to keep it at bay.