"Good knife!" David had used many cold weapons before, and he could tell at a glance that this was a good knife. Moreover, David was very aware of how practical the repair function was.

It is not difficult to sharpen a knife to a razor-sharp edge, as long as the sharpening skills are good, any knife can be sharpened to the point of being able to cut a hair in half. However, how long this sharpness can be maintained depends on the material of the knife. A knife with poor material, no matter how sharp it is, will quickly become dull after a short period of use, which is known as edge retention.

In fact, in David's plan, he also intended to stockpile some weapons. As the saying goes, "If the neighbor hoards grain, I will hoard guns, and the neighbor will become my granary." Stockpiling a large amount of supplies, but without the corresponding strength to protect them, in the end, he will become fish on someone else's chopping board.

This alloy war knife and genetic potion arrived just in time. In his previous life, David was deeply impressed by those powerful mutants. He had witnessed a fire-type mutant incinerate hundreds of zombies with just one move. And now, as long as he drank this genetic potion, he could also become a mutant in the apocalypse.

David retrieved the alloy war knife into his reserve space. As he did so, he couldn't help but hope, "Can items obtained as rewards have a critical strike chance like supplies?" However, there was no change in the alloy war knife after it was retrieved into the space, and the system did not give any prompts. It seems that items obtained as rewards are not counted as resources by the system.

After retrieving the alloy war knife, David took out the tube of genetic potion. The cork of the potion bottle was not tight, and David easily pulled it out.

After inquiring the system, he found out that the genetic potion was to be taken orally. Smelling the bottle mouth, David did not detect any special taste. This tube of genetic potion looked like mineral water, colorless and tasteless.

Without much hesitation, David drank the entire potion in one go, not wasting a single drop. When the potion entered his stomach, a fiery feeling surged up from inside his body.

David felt his breathing become difficult for a moment, his heart rate rapidly increasing, and hot air rushing to his brain. His muscles all over his body began to twitch constantly, and tremendous pain came from all over his body. This pain was like all the muscles in his body cramping at the same time. His bones were cracking, as if his body was being torn apart and reassembled.

David gritted his teeth, and beads of sweat the size of beans had already fallen from his forehead. Fortunately, this pain did not last too long and ended after a few seconds. After the pain subsided, What follows is a feeling of relief like an empowerment.

David looked at himself in the mirror and noticed that his body had undergone some changes. Even his height seemed to have increased slightly. He felt a explosive power within his body and his muscles and bones had become much stronger than before. Even his eyesight had been enhanced, allowing him to see things clearly even from a kilometer away. The strengthening effects of the gene medicine were truly powerful and immediate.

At this moment, a prompt from the system sounded in David's mind: "You have successfully taken the gene medicine. Your physical fitness has greatly improved. You have gained immunity to viruses and will be permanently immune to most diseases."

Upon hearing the system prompt, David's eyes lit up. This meant that even if he was accidentally bitten by a zombie, he wouldn't be infected and turned into one. And the immunity to most diseases was also very practical. At least he wouldn't have to worry about catching colds or fevers in the future.

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To test his strength, David grabbed a wrench from his toolbox and with a gentle effort, he bent it ninety degrees. The formidable strength surprised even himself.

Not only had his strength increased, but his agility, endurance, and physical condition had also greatly improved. David was very satisfied with the effects of the medicine. With such a powerful physical fitness, combined with his combat skills honed in the apocalypse, dealing with ordinary zombies would be a piece of cake.

Inspired by the alloy battle sword, David opened his computer and searched online, finally finding a swordsmith studio called "February Tea House". This studio specialized in forging performance knives. Performance knives are knives made directly from high-strength modern alloy steel, with proper heat treatment, forged solely for the pursuit of extreme performance.

With the blessing of modern technology, performance knives are often more practical than traditionally forged knives. After all, technology is constantly advancing, and modern tool steel, die steel, and powder steel are all powerful varieties that ancient people could hardly imagine. Modern steel mills have ultra-high-temperature melting furnaces, electromagnetic equipment, computer numerical control precision temperature control, just-right steel element ratios, and various large-tonnage hydraulic hammers...

The steel produced by this process is difficult to surpass even by traditional swordsmiths with exquisite handcrafting skills. Interestingly, these performance knives that focus on practicality are often cheaper than traditional knives. The reason is that traditionally forged knives usually have unique textures and blade patterns, higher aesthetic value, and some artistic value, known as "sentimental value".

But for David, the appearance of the knife was not important. What was most important to him was durability and sturdiness.

David ordered the top-performance knife in the studio, which cost over 6,000 yuan per knife, and he ordered 20 knives. With these 20 knives stored in the storage space, he now had 2 million knives, which was more than enough.

David confirmed with the studio owner that all 20 knives were in stock and would be delivered within five days at the latest.

With weapons secured, David thought about getting a set of armor as well. After some tinkering on the computer, he finally contacted a workshop specializing in armor. Although most of the armor they made was for movie sets or private collectors, making practical armor was not difficult for them.

David expressed his requirements over the phone: the armor had to be puncture-proof, slash-proof, bulletproof, and as lightweight as possible without affecting his movements.

The owner said this was not difficult, and suggested using modern materials such as Kevlar, carbon fiber, and some special alloys to make it. Of course, this would cost extra, and the owner quoted a price of 90,000 yuan.

David agreed to the price, and even paid an extra 10,000 yuan for expedited shipping.

Although the price was quite expensive, for David, buying this armor was like buying 100,000 sets, making it an incredibly worthwhile investment.