When the heart of the mutant bamboo rat appeared, Han Feng did not hesitate at all, and stabbed into the heart in front of him, which was larger than an adult's head.

A moment later, a life core the size of an egg, with a round body and a crystal clear luster, fell into Han Feng's palm.

"This life core is not quite right!" Han Feng looked at the life core in his palm, and his brows furrowed unconsciously.

The inside of a normal life core should be as crystal clear, but now the inside of this life core in his hand is covered with spider web-like cracks.

"Could it be that this mutant bamboo rat in front of you hasn't completely completed its evolution?" For the life core in his hand like a defective product, Han Feng could only shake his head helplessly.

In fact, after he found out that the Unimog RV had seriously injured the mutant bamboo rat, he doubted the true level of the mutant beast in front of him, and the mutation of the life core confirmed his conjecture even more.

After collecting the life core of the mutant bamboo rat, Han Feng quickly walked to the front of the Unimog RV.

"It's too bad, isn't it?" When Han Feng walked to the front of the car and saw the current situation of the RV from the front of the car, he couldn't help but feel a little worried.

The metal bumper at the front of the Unimog has sunk completely into the front of the car, forming a "V" shaped groove, and directly above the groove is the front windshield that is already full of cobweb-like cracks.

However, the most seriously injured should be the right front tire of the RV, the tooth on the mouth of the mutant bamboo rat more than one meter long, now firmly stuck on the tire, the unusually thick RV tire, almost split in half, it seems that there is no possibility of repair.

At this moment, the electronic prompt sound in Han Feng's mind rang again.

"The mechanical core has detected a high-energy life source, please put it in the absorption tank." After the electronic beep, a cylindrical metal groove rises from the cab's main center console.

"Do you want to keep the core of your life?" This thought flashed through Han Feng's mind, but he immediately gave up on this unrealistic idea.

At present, he has not yet become an evolutionary, and this life core is useless to remain in his body, and even if he successfully evolves by then, then he disdains to use this thing to improve himself, or the improvement obtained by combat is more reliable.

Thinking of this, Han Feng didn't hesitate any longer, sat directly in the driver's seat, and carefully put the egg-sized, crystal clear life core in his hand into the cylindrical metal trough.

"Click!"

As soon as Han Feng put the life core into the metal trough, there was a mechanical sound, and then the cylindrical metal trough slowly shrank back.

After the metal groove was completely closed, the electronic prompt sound of the mechanical core sounded in Han Feng's mind again, and his eyes went black again, and the hologram of the Unimog RV appeared in his mind again.

"The mechanical core has successfully absorbed the high-energy life source, and the mechanical core has evolved since its beginning, please choose the direction of evolution."

Then a row of words appeared in front of Han Feng's eyes, and when he stared at these words, the result of evolution would be automatically identified on the hologram of the RV.

"Option 1: Upgrade the vehicle's armor and increase its protection strength to the alloy armor level."

"Option 2: Upgrade the vehicle's fuel tank to increase the capacity of the 180L fuel tank and improve the robustness of the fuel tank."

"Option 3: Upgrade the engine of the vehicle to increase the engine speed and reduce the fuel consumption of the engine."

"Option 4: 10L Super Dimensional Storage Upgrade, Increase 10L Super Dimensional Storage."

"Option 5: Vehicle tires are upgraded, and vehicle tires are replaced with run-flat tires, which will not burst no matter how they break."

"Option 6: Add a vehicle-mounted weapon system, a Sky Dome ultra-high-energy electromagnetic cannon module, and call 200L of fuel to convert into high-energy electromagnetic waves for each shot, causing a wide range of damage, with a cooldown time of 1 hour."

…………

"Option 11: Open the equipment manufacturing workshop, and add an equipment workshop to the rear of the vehicle, which can absorb items of most materials, and directly create equipment through the automatic equipment manufacturing instrument."

Han Feng couldn't help but be moved after reading the evolution direction of the mechanical core one by one, every evolution option could greatly improve his survivability in the last days.

However, he is most concerned about two evolution options, one is the on-board weapon system, and the other is the equipment manufacturing workshop.

In the battle between Han Feng and the mutant bamboo rat just now, it was obvious that he felt the lack of his current attack power, especially against the medium and large mutant creatures such as mutant beasts.

If it weren't for the fact that the mutant bamboo rat just now hadn't completely completed its evolution, he would definitely be the one lying here today.

Therefore, the on-board weapon system is a shortcoming that he urgently needs to supplement.

In addition, the equipment manufacturing workshop also made Han Feng very greedy.

In the last days, he has seen too many evolutionary levels, but he suffers from the lack of an evolutionary who can take advantage of the weapon, and sometimes in the battle with zombies or mutant beasts, he lacks a straw that crushes the camel, and the weapons and equipment in his hand are undoubtedly the straw that crushes the camel.

And a manufacturing workshop that can automatically customize and manufacture equipment is a dream prop in every way.

However, now Han Feng could only smile bitterly and forcibly take his eyes off these tempting options.

The reason for this is very simple, all of the options he saw before are gray and cannot be selected, and there is a supplementary note at the end of each option: (the high-energy life source is insufficient, and the option cannot be activated).

This is no different from entering Baoshan empty-handed.

Han Feng condensed into the end of the mechanical core self-evolution option, and found that the last option was finally lit up and was an optional state, so he exhaled deeply.

The last option is to repair the Mechanical Core Fusion, which is currently damaged, and the remaining energy is automatically stored after the fusion is repaired.

After seeing this option, Han Feng basically didn't think much about it, so he directly chose this option.

The most important thing for him now is to get the Unimog motorhome in order, and if he wants to abandon the motorhome on this country road with no village in front of him and no shop in the future, then his future journey will be extremely difficult.

And when Han Feng chose the option of repairing the mechanical core fusion, a burst of light instantly swayed on the hologram of the Unimog RV in his mind, and the front of the car, which had been knocked in, actually bounced back slowly.

The windshield, which was originally covered with cobweb-like cracks, the cracks on the glass are fading little by little, and the whole glass is becoming transparent again.

As for the tires, which had been almost split in half, they slowly squeezed out the rat tooth stuck between them, and the two tires began to merge with each other, and the patterns on the tires reappeared.