When Biaozi and others transported large quantities of iron ore and materials back to carriages No. 2 and No. 3.

A Level 2 Energy Stone was tossed by Chen Mang into the funnel beside the train elevator.

The train elevator started up again.

Slowly descending.

...

Coming once more to the train tunnel, passing through the Mechanical City, heading all the way north!

What lies ahead, he does not know.

But he knows he has a train and cannons.

Whatever lies ahead.

It's his.

After approximately half an hour of travel, he finally saw the end of the train tunnel, only to find that the marks of mechanical carving suddenly disappeared, revealing a huge natural cave, inside pitch-black, without a glimmer of light.

Chen Mang glanced at the control screen.

Both the Target Detection Radar and Resource Detection Radar showed no activity ahead.

But for some reason, he felt a bit uneasy; the screen indicated that they were no longer in the "Dangerous Valley" area, but rather in an unknown territory.

Just as the train's engine entered this cave, a piercing alarm suddenly sounded inside the train compartment!

Flashing red continuously!

The Target Detection Radar's screen revealed a monster inside the cave, with a level of... Level 15.

Seeing this, Chen Mang's expression slightly changed; his train armor was only Level 13.

At the same time——

The Resource Detection Radar also began to flicker wildly; around them were mines everywhere, laid densely all over the cave, with as many as three Level 4 iron mines visible at a glance!

The train's headlights instantly illuminated the cave's interior.

A gigantic two-headed giant burst out from the darkness, roaring and smashing its Wolf Fang Club heavily onto the train!

"Boom!"

The Constant Star Train, unable to dodge, took the hit, causing the train compartment to flash red madly, and the smashed No. 5 carriage was nearly flattened by half, teetering on the brink of scrap!

...

Quickly pushing the control lever, Chen Mang, maneuvering the train away from the monster into a corner, swiftly scanned the information on the screen.

"Carriage No. 5 Armor Integrity: 34%, Doomsday Cannon No. 5 Integrity: 0%..."

"Mechanical Nanospiders are rapidly producing and heading for repairs."

The monster did not move recklessly again, but stood there staring fixatedly at the Constant Star Train, eyes filled with bloodlust and cruelty, body slightly leaning forward, ready to charge at any moment!

Over twenty meters tall, it was a massive creature, completely blue.

It had two heads.

Incredibly imposing.

"Damn..."

Seated inside the train compartment, Chen Mang glanced at the screen showing the No. 5 Doomsday Cannon with an integrity of 0%, muttering: "Creating a Level 20 Doomsday Cannon is really expensive, you neck-grown beast!"

With zero integrity, it was beyond repairs, completely scrapped.

It could only be rebuilt.

No matter how massive this monster was, its explosive charge speed was incredibly fast, faster than the train!

Right then——

"Roar!!!"

The two-headed monster roared again, leaning forward and once again raising its massive Wolf Fang Club, launching a deadly charge against the Constant Star Train!

In the distance, even a sonic boom sound could be heard faintly.

However, the Constant Star Train, already prepared, immediately switched to its spider leg configuration, crawled up the wall behind it with extreme agility, and hung upside down from the ceiling, successfully avoiding the hit.

Moving swiftly along the ceiling, the remaining nine Doomsday Cannons of the Constant Star Train locked onto the two-headed monster, barrels spinning swiftly!

"Boom boom boom!"

Shells laden with fire poured out, and within moments, the monster was engulfed beneath a barrage of artillery!

The upgrade of the Doomsday Cannon didn't increase power, only range and firing speed.

But firing speed is power!

The faster the firing speed, the greater the power!

With all guns blazing, the nine Doomsday Cannons released Level 17 shells one after another, firing like a metal storm at the two-headed monster!

Only...

"..."

Chen Mang's pupils contracted sharply, as he saw the two-headed monster, furiously spinning its Wolf Fang Club in its grip, deflecting all the shells; after a round of salvo, it was only lightly injured?

"This is possible?!"

He couldn't afford to think too much and fired another volley hastily.

Then he crawled along the ceiling, controlling the Constant Star Train to first reach the monster's back and fire another volley, aiming for the weak spot!

However...

No matter its size, its reactions were quick; it spun rapidly again, blocking the volley aimed at its back.

Especially since he aimed at multiple spots simultaneously—its feet, calves, heads, belly—but the results were still all blocked.

The two-headed monster was only slightly harmed by the shrapnel, with no fatal wounds sustained thus far!

Luckily!

The cave was incredibly high, easily a hundred meters tall; if he stayed suspended from the ceiling, he could gradually wear down this boss.

But the next moment——

He suddenly saw the monster's knees bend, a sense of dread flashed in his heart; the Doomsday Cannons unleashed another roar, but the originally crouched monster barely reacted, furiously spinning its Wolf Fang Club again, deflecting shell after shell.

This monster is clearly trying to jump and get him!

If the opponent is preparing to jump, it evidently can jump that high.

Should he retreat?

A shadow flashed in Chen Mang's eyes; if he wanted to escape, he could now use the drill to quickly flee this cave, but... the numerous mines in this cave tempted him; he was currently short of these iron ores!

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