High-level martial arts: Contract cashback, invincible starting from the Zerg.

The next day at dawn.

The underground platform of the permafrost fortress was still shrouded in the lingering chill.

A jet-black armored train was parked on the tracks. Its exterior was engraved with fine de-icing runes of the Snowstorm City-State, while the front of the train was engraved with the emblems of the Great Xia Kingdom and the Snowstorm City-State.

This is the permafrost train exclusive to the permafrost fortress.

Specifically designed for use by officers and troops for cross-regional deployment, it can not only travel smoothly and quickly in blizzards at minus sixty degrees Celsius, but its armored shell is also strong enough to withstand attacks from Earth-level experts.

Chu Zijing was already waiting on the platform.

However, when he saw Chen Feng and his group approaching, his pupils still contracted almost imperceptibly.

Chen Feng walked at the front, dressed in a sharp martial arts armor with a winter coat over it, his expression calm and composed.

The eight Martial Gods following behind him were all tall and imposing, their auras concealed, and their movements exuded the composure and killing intent of seasoned warriors. They were all Martial God level experts above the Heaven Rank!

Chu Zijing felt a chill run down his spine.

He knew this Demon Slayer was no ordinary person, but he hadn't expected that all of his subordinates were Heaven-Rank Martial Gods. Not to mention the size of a field regiment in the Frozen Fortress, even a field division could only deploy 16 Heaven-Rank or higher Martial Gods!

"Commander, the train is ready to depart at any time." Chu Zijing composed himself, stepped forward, and gave a standard military salute.

Chen Feng nodded, his gaze sweeping over the heavy doors of the armored train: "Get on."

The martial gods entered the carriage one after another.

......

The interior environment of an armored train is completely different from the cold, hard exterior.

The interior walls of the carriages were fitted with temperature-controlled air vents, and the warm airflow quickly dispelled the chill from the warriors. In the best officer's carriage, there were even sixteen soft chairs fixed in place.

As the train slowly pulled out of the underground platform, the wheels made a series of low, rhythmic clanging sounds as they rolled over the alloy tracks.

The wall lamps in the underground tunnel of the fortress rushed backward, and the howling north wind swirled snowflakes against the car windows, making a fine, rustling sound like silkworms gnawing.

In just a moment, fine frost flowers condensed on the windowsill.

Chen Feng looked out the window, his gaze slowly spreading along the speeding track.

Near the train tracks lies compacted permafrost, its dark brown surface covered with half a foot of snow, sculpted by the fierce winds into wavy snow ridges.

Along the tracks, a maintenance post stands every few hundred meters. Beside the tracks amidst the wind and snow, the entire post glows with a pale blue light, which slowly melts the icicles that cling to it. The melted snow drips down and immediately condenses into new icicles below the post.

Their varying lengths resemble a row of translucent fangs.

Chen Feng extended his gaze into the distance and immediately saw the gently undulating, frozen wasteland in the distance.

The permafrost plains, protected by the permafrost fortress, are characterized by jagged mountains and dense forests, completely different from the permafrost plains in the distance that have been transformed by the Purple Clan.

It was filled with an artificial sense of peace.

Seeing Chen Feng slowly withdraw his gaze from the snowy plain outside the window, Chu Zijing smiled and spoke.

"Commander, don't let the bulky appearance of this permafrost train fool you. In the far north, it's a more reliable means of transport than a B-2 transport plane."

Upon hearing this, Chen Feng withdrew his gaze and looked at Chu Zijing.

The martial gods sitting next to Chen Feng also glanced at Chu Zijing, clearly quite interested in this war vehicle exclusive to the far north.

"Let's talk about the outer shell first."

Chu Zijing raised his hand and knocked on the side of the carriage wall, but the sound was a dull metallic one.

"With three layers of obsidian alloy inside and out, and each carriage also equipped with the cold-proof design of the Snowstorm City, even a blizzard or a full-scale bombardment by the Earth-rank insectoids cannot stop the armored train from moving."

Chu Zijing paused, then pointed to the floor beneath his feet: "Moreover, this train is unlike the trains in the Southern Territory, which rely on Tia crystal cores for propulsion. Because here, Tia energy activity is low, and ordinary internal combustion engines could freeze and shut down at any time. It relies on the ice crystal ore of the Snowstorm City-State. Under full load, it can travel on the entire track for five days and five nights without needing resupply, making its safety factor extremely high."

"How many of these trains are there, brother?" Li Can asked with a smile.

"If you include the backup... 13 armored trains can be dispatched along the entire 200-kilometer railway line, and a complete legion and the necessary supplies can be transported from the eastern front to the western front in just one hour."

Chu Zijing said earnestly.

"Moreover, there are concealed stations every 500 meters along these tracks. If the tracks are attacked, our personnel can safely leave from the concealed stations at any time and take the underground train to their destination."

"That's strange, why not just take the underground train? Wouldn't that be safer?"

Chu Zijing smiled.

It seems they were prepared for this issue long ago.

"Safety is enhanced, but the security of the defenses also needs to be guaranteed."

"What do you mean?" asked the martial god, Ootake, puzzled.

"The armored train we are on is not just for transporting troops; it is also the second line of defense for our permafrost fortress."

Chu Zijing pointed to the ceiling of the carriage above him, his tone becoming more serious.

"This main track doesn't just connect the main bunker to the various defense zones; it's an iron skeleton laid along all the defense zones. Each armored train has twelve heavy gun emplacements, and each carriage has more than a dozen operable firing ports on each side. As long as a battalion of elite infantry goes in, even if the front line is torn open by the swarm of insects, the train can weld the gap shut with heavy firepower. This is several times faster than sending troops to reinforce from other defense zones."

The furrowed brows of the Martial God Da Zhu slowly relaxed, and he said thoughtfully, "So they are mobile firing points. No wonder they are all built outside."

Chu Zijing paused, then spoke of the hidden platforms beneath the tracks: "As for the underground tracks, they're a backup plan. If the surface tracks are destroyed by the insect swarm and the train is surrounded by heavy forces, the personnel can evacuate to the nearest hidden platform. Even if the insect swarm wants to enter the inner platforms, it won't be that easy."

"Are there any precedents for these in actual combat?" Chen Feng suddenly asked.

"Not yet. The Purple Insect Clan has not been able to break through the first line of defense," Chu Zijing said with a smile.

Chen Feng didn't speak, but looked again at the snow mist rushing past the window, and the rhythm of his fingertips tapping on the windowpane changed.

The Purple Clan is not an organization like the Iron Clan; their war strategy is not to sacrifice strategic advantages for a local war.

Therefore, there are almost no probing actions that are not very meaningful.

More often than not, these are reconnaissance operations conducted in preparation for large-scale warfare, and such operations are likely to be perceived as small-scale harassment by the fortress's orbital forces, leading to psychological underestimation.

This is also why Chen Feng felt somewhat heavy-hearted when facing the Purple Insect Clan.

......

Two more hours passed as the armored train continued its trek through the snowstorm.

The outlines of a continuous stretch of buildings gradually emerged from the snow and mist ahead.

Towering kinetic energy turrets pierced the snow curtain, layers of defensive fortifications stretched along the cliff face, and dark military flags fluttered in the wind on both sides of the train tracks.

"Commander, we've arrived. This is the western defense zone of the Permafrost Fortress."

Chen Feng looked up.

Amidst the howling wind and snow, a somewhat heavy steel fortress lay silently on the frozen canyon, like a lurking steel beast, waiting for the best opportunity to attack.

And from this moment on, Chen Feng's legendary battlefield began to slowly unfold.