Chen Mang glanced at the iron ore units on the train panel; there were still 61,000 units of iron ore left.

These 110,000 units of iron ore were quite durable.

Without much hesitation, he consumed 4,400 units of iron ore to upgrade the "Car Sound System" accessory to level 10, and obtained two corresponding supermodel effects.

This is a white-grade accessory, so upgrading it consumes relatively fewer resources.

-

"Car Sound System Level 5 Supermodel Effect": If the train is equipped with 'headlights' and 'train assistance AI' accessories, when playing music, the headlights will automatically change light and color, creating a stage light show that matches the song rhythm through visual effects.

"Car Sound System Level 10 Supermodel Effect": Can emit ultrasonic noise above 20,000 Hertz. If the grade of consumed energy stone is high enough, it can produce even higher Hertz ultrasonic noise.

-

The first supermodel effect goes without saying.

Normal humans can hear sounds in the frequency range of approximately 20 Hertz to 20,000 Hertz. This is a natural evolution in humans; if they could hear lower Hertz sounds, they could even hear the sounds of their organs moving inside their bodies, living every day in noise.

And sounds over 20,000 Hertz are already inaudible to the human ear.

"Hmm..."

After thinking for a long while, Chen Mang could not figure out any application scenarios for this supermodel effect, unless there were some creatures that could hear highly pitched sounds, then maybe he could attack them with noise using this sound system?

Forget it.

Better to have it than not.

Then he turned his attention to the "Built-in Fire Control System" accessory, which is currently the only accessory in the Constant Star Train with its muzzle pointed inward. It's expensive to make, requiring a full 1,000 units of iron ore, making it pricy amongst green-grade vehicle accessories.

The upgrade cost is quite high too.

He hadn't been willing to upgrade it before, but now that there's more iron ore, he naturally wants to upgrade everything he previously hesitated to upgrade.

In fact, upgrading this accessory is quite unnecessary.

After all, this accessory points its muzzle inward; humans aren't monsters. For humans, whether it's a heavy machine gun loaded with level 1 heavy machine gun bullets or level 10, you're basically dead with one shot.

This accessory is a composite accessory composed of several pocket-sized heavy machine guns. Each carriage ceiling has a miniaturized heavy machine gun embedded in it.

This accessory is the same as a heavy machine gun.

Upgrading does not increase power.

It merely enhances effects like rate of fire and range, but the actual power of the fired bullet depends on the level of bullets loaded.

Low-level heavy machine guns cannot use high-level bullets; for example, to use level 3 bullets, the heavy machine gun must be upgraded to level 3.

Therefore, in theory, level one of this accessory is sufficient.

The reason for upgrading it to level 10 was purely to check out the supermodel effects to avoid missing any incredible ones.

After consuming 45,000 units of iron ore,

the "Built-in Fire Control System," this green-grade accessory, was also upgraded to level 10 by him, and two brand-new supermodel effects emerged.

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"Built-in Fire Control System Level 5 Supermodel Effect": Can fire blank bullets, consuming 1 unit of iron ore per 10 blank bullets.

"Built-in Fire Control System Level 10 Supermodel Effect": Can fire nerve bullets, which are not fatal but bring unbearable pain.

-

"Ah?"

A flash of confusion appeared in Chen Mang's eyes, not because these supermodel effects were too strong, but...

He had originally thought that the "Built-in Fire Control System" was like the "Three-legged Cat Heavy Machine Gun," where upgrading only increased rate of fire and range and such, but... he hadn't expected that upgrading the "Built-in Fire Control System" would also increase the number of heavy machine guns mounted on each carriage's ceiling.

Initially, the Constant Star Train had a total of 10 carriages and 1 train head.

Each carriage and the train head had a heavy machine gun installed on the ceiling, but now each carriage ceiling has as many as 10 heavy machine guns.

"..."

Inside the train, sitting at the control panel, Chen Mang gazed at the 10 heavy machine guns embedded in the ceiling of the train head, with their black muzzles directly aimed at the train room doors, giving a full sense of deterrence.

Riot?

No need to worry about any riot anymore.

What a joke.

The Constant Star train currently has only four "Three-legged Cat Heavy Machine Guns" installed on the carriages, facing outwards, while the inversely mounted pocket-sized heavy machine guns on the ceiling, facing inward, total 110.

With these 110 heavy machine guns positioned here, forget about a thousand slaves rioting, even double that can be easily exterminated.

Efficiency at its peak.

Insanity!!!

...

Outside the train.

"Mr. Li, any leads?"

A young man furtively approached Mr. Li, asking in a low voice.

"Yes."

Mr. Li squinted slightly, looking at a middle-aged man in the distance. He had already found a suitable target. Today, under his observation, although this man appeared to work diligently while mining, he noticed that the man kept eyeing the train's external accessories.

Although uncertain of his thoughts,

this man was clearly a dangerous individual, definitely harboring some intentions.

At this moment—

the middle-aged man suddenly broke away from the crowd, quickly finished the bread in his hand, and stealthily headed toward the goblin car number 10, clearly intending to do something questionable.

"The opportunity has come!"

Mr. Li's eyes lit up, and he immediately stood up to follow closely, also heading toward the goblin car number 10. He finally got a chance to make his move!

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