When the armored vehicles that came to pick up Meng Wan'er and those survivors who had lost their sense of hearing and went to the Fucheng Security Zone, they let out a roar again and returned in the direction of the Fucheng Security Zone.

Ning Xueru, who returned to the Unimog RV, came to the small kitchen in the living area for the first time, rolled up her sleeves directly, and began to prepare lunch for Han Feng.

And Han Feng, who was sitting in the driver's seat, was constantly rubbing his hands, the gold-level life core obtained last night, thinking about whether to use the gold-level life core to upgrade the evolution option of the mechanical core.

If he went to the Demon Capital this time and could successfully get the crystal energy supplement, then the gold-level life core in his hand now was very likely to be saved.

However, Han Feng sat in the driver's seat, only thought for half a minute, and still put the gold-level life core that shone with a multicolored luster into the cylindrical metal slot that popped out on the center console of the Unimog RV.

Although he went to the magic capital this time, it was very likely that he would harvest crystal energy supplements, but at present, this is just a hypothesis and has not really been realized, so for now, it is better for him to honestly upgrade the evolution option of the mechanical core.

When the gold-level life core was placed into the cylindrical metal slot, Han Feng's familiar electronic sound sounded again.

"Selected: The vehicle energy shield system has been upgraded, and the energy shield system has been upgraded from a civilian standard system to a shipborne small energy shield system, with a shield energy intensity of 1200 GJ, and the shield adopts real-time recharge technology, and the overall shield recharge time is 1 hour."

After struggling for a while, Han Feng chose the latter among the two options of adding a silver-like super-metal shell and upgrading the energy shield system.

From last night's battle, he had discovered that the effect of the energy shield system was indeed more useful than a purely physical defense.

The Energy Shield system can defend against sonic waves, spatial attacks, etc., without any trace of attacks.

Although the thickness of the supermetal shell is about 7000 mm of homogeneous armor, the supermetal shell can only defend against those attacks that directly act on the surface of the Unimog RV, and cannot block the invisible attack.

"Selected: The vehicle energy shield system has been upgraded, and the high-energy life source has reached the standard, please put 500 kilograms of first-grade titanium essence, 200 kilograms of first-class aluminum essence, and 100 kilograms of first-class gold essence into the pop-up physical material conversion cabinet."

Although Han Feng had already prepared in his heart, when he heard the electronic prompt sound, the number of materials needed sounded, and his eyebrows were slightly raised.

The energy shield system has been upgraded from a civilian standard system to a shipborne small energy system, and the amount of physical materials required to build it is dozens of times that of the civilian standard system.

The one hundred kilograms of first-grade gold essence alone, if converted into ordinary gold, it is estimated that it can be piled up into a gold mountain completely made of gold in front of Han Feng.

And the five hundred kilograms of first-grade titanium essence, and the two hundred kilograms of first-grade aluminum essence, not to mention, even if these two things are not replaced with ordinary materials, they can completely bury Han Feng alive.

However, after Han Feng looked at the massive materials in front of him, although he was a little shocked in his heart, he still showed a relaxed smile on his face in the end.

The reason is very simple, that is, when he was in the Fucheng Security Zone, he had already hoarded a large amount of material essence.

Now, although upgrading the energy shield of the mechanical core requires a large amount of material essence, at this moment, the material essence carried in the Unimog RV is enough to pay for this upgrade.

Therefore, Han Feng did not hesitate at all, and directly chose to call the corresponding materials in the Unimog RV, fill them into the physical material conversion cabinet, and upgrade the energy shield system of the mechanical core.

When the energy shield system was upgraded, the required material essence was continuously injected from the inside of the Unimog RV, and the electronic sound in Han Feng's mind rang again.

"Upgrade the energy shield system, the high-energy life source has reached the standard, the materials in the physical material conversion cabinet have reached the standard, and the energy shield system is being upgraded...... The Energy Shield system has been upgraded. ”

With the sound of electronic sound, the original Unimog RV, the middle of the body, the two rows of metal strips about two meters long, only ten centimeters wide and high, suddenly began to expand.

These two metal bars became a whole ring of metal around the entire Unimog RV.

But to be honest, when the metal strip is wrapped around the body of the Unimog RV like a lifebuoy, the shape of the entire Unimog RV is a bit weird.

The current Unimog RV is like those bumper cars in a playground, the bumper car is surrounded by a black rubber wrap, and the Unimog RV is surrounded by a glossy pure metal strip.

At the same time, after these two metal bars become a metal ring around the entire Unimog RV, the output power of the energy shield system will also be several times larger than that of the same period last year.

Of course, the increase in output power will definitely affect the damage that the energy shield can withstand.

For example, the previous energy shield system could resist the frontal attack of ordinary large-caliber artillery shells, but the current energy shield system can directly resist the frontal attack of cruise missiles, which is the benefit of the increased output power.

However, although the mechanical core has upgraded the energy shield system, Han Feng and Ning Xueru, who are sitting in the car, have not felt the changes in the RV.

It wasn't until Han Feng got out of the car and took a look around that he felt the change in the appearance of the RV.

And when he re-boarded the RV, the smell of food wafted out of the living area of the RV.

Ning Xueru was bringing a pot of vegetables to the small dining table and beckoned Han Fengdao:

"I've finished your lunch, so let's eat now."

Han Feng looked at the pot of oily braised chicken thighs and a stack of green vegetables on the dinner table, so he naturally didn't shirk it, sat down with a golden knife, directly picked up the rice bowl, and enjoyed the delicious food made by Ning Xueru.

However, Han Feng only quickly took two bites of rice, and Ning Xueru, who was sitting opposite him, saw that something was wrong with Han Feng at this moment.

Although Han Feng was eating heavily, his unusually pale face at the moment could not be concealed, and a sense of weakness appeared from Han Feng's body.

"You look so bad, what happened yesterday?" Ning Xueru had just taken a bite of food when she noticed the unusually pale face on Han Feng's face, and asked with concern.

Facing Ning Xueru's concerned inquiry, Han Feng shook his head slightly: "It's nothing, it's just that I encountered a gold-level mutant beast last night, and I was a little injured when I fought with that gold-level mutant." ”

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