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After Duane and Shirley left, David returned to the base with the team.

"That old guy today was brutal, actually transforming himself into a zombie!"

"Yeah, how can there be people like that in the world?"

Arnold and Sophie couldn\'t help but shudder at the thought of Alvin\'s twisted appearance earlier.

"In the apocalypse, some people will do unimaginable things for survival," David explained. He knew that Alvin\'s actions were normal for someone who craved power in the apocalypse. However, in his eyes, it was particularly extreme.

"From now on, each of us needs to improve our level and strength," Charles pondered aloud. Throughout the battle today, it was mostly David who was involved, and although they wanted to help, their strength was far below Alvin\'s. This made Charles immediately realize their shortcomings.

It was impossible to let David bear the burden of every battle alone. As team members, they had to step up at critical moments. Charles\' words were met with agreement and nods from the rest of the team. Now, their method of leveling up was no longer just absorbing low-level crystals, but accumulating experience through battles to increase their levels. The combat training they had undergone during this period had improved the level of each team member, but they still fell short of their ideal level.

Seeing everyone lost in thought, David smiled and said, "Leveling up is something that can\'t be rushed. Be careful not to be too hasty. When your combat experience accumulates to a certain extent, your level will naturally increase."

Listening to David\'s words, Charles nodded. He was also determined to participate in more combat training to increase his own strength.

After a pause, David remembered the defense crystals he obtained from Alvin\'s body. After a hundredfold critical strike by the system, the quantity had reached one hundred. Adding the leftovers from before, there were a total of one hundred and ten defense crystals in the system\'s warehouse.

After some consideration, David decided to continue upgrading the base. As their only refuge in the apocalypse, the importance of the base was self-evident to each member of the team. Coincidentally, Arnold was eager to go out and continue hunting for zombies, so David allowed them to drive the war vehicle and engage in small-scale hunting around the parking lot.

As the other members of the team left the underground parking lot, David also walked out of the base and stood in front of it. Looking at the faint golden glow emanating from the diamond base, David\'s mind stirred, and sixty triangular defense crystals appeared in his hand. Feeling the power emanating from the crystals, David decided to upgrade the base to a diamond level. Compared to the golden level, a diamond-level base had higher defense and better concealment.

David was also grateful for obtaining the defense crystals from Alvin. Otherwise, upgrading the base to a diamond quality would require at least tens of thousands of advanced crystals. Even though he was a resource-rich individual and could easily produce so many advanced crystals at any time, it still pained David. Each crystal in the warehouse was obtained at the cost of his life. Using so many at once would even make a landlord feel distressed for a while. Fortunately, with the one hundred defense crystals from the critical strike, David felt much more at ease.

"System, upgrade the golden base to a diamond base." After a moment\'s pause, David decisively spoke to the system.

[Ding! Detected that the host wants to spend sixty defense crystals to upgrade the base to a diamond level! ]

[Please confirm, host! ]

"Confirmed!" David said in a deep voice.

[Ding! Sixty defense crystals have been deducted. Upgrading in progress! ]

As the system\'s voice sounded, the sixty defense crystals in David\'s hand immediately disappeared.

[Ding! Congratulations, host, the base has been successfully upgraded! ]

Soon, the sound of the base upgrade completion echoed in David\'s ears. At the same time, a dazzling white light flashed before David\'s eyes! The light quickly descended, causing strange ripples to appear on the previously golden walls of the base. These ripples resembled sunlight refracted on a crystal ball, radiating light from all directions.I think you should take a look at

David quickly approached to inspect and discovered that the previously smooth walls of the base now had numerous intricate facets. Each facet emitted a faint colorful glow, and upon closer inspection, he could vaguely see the glowing structures inside.

This immediately made David think of diamonds, and he instantly understood. The diamond-level base had been completely covered with a thick layer of diamond material on its exterior. Diamonds were the hardest substance in the world.

"This is great! With this, the defense of the base will reach a terrifying level!" David exclaimed excitedly as he touched the incredibly smooth facets.

But before he could finish his excitement, the system\'s voice rang in his ears again.

[Ding! Detected that the host\'s base has reached the diamond level. Activating the base remodeling function! ]

"Hmm? Base remodeling function?" David asked with some confusion.

[Yes, host. Only a diamond-level base can activate this function.]

[In this function, the host can remodel various aspects of the base.]

[The remodeled base does not affect its defense, and the changes take effect immediately.]

The system explained again, seemingly understanding David\'s confusion. Listening to the system\'s explanation, David understood. No wonder he had never heard of this function before; it required a higher level. So he asked the system again, "How can I remodel it?"

[The host can remodel the base by consuming corresponding resources! ]

As it spoke, a translucent information template appeared before David.

[Special Alloy Gate: Twenty alloy steel plates]

[Blast-Proof Glass: Three hundred rounds of 7.62mm caliber bullets]

[Mutated Rhino Skin Flooring: Five hundred sheets of mutant beast skin]

[Multi-functional Bedroom: Three hundred pieces of wood, one hundred alloy steel plates]

[Multi-functional Living Room: Four hundred pieces of wood, one hundred fifty alloy steel plates]

Looking at the complete list of base remodeling projects before him, David couldn\'t help but nod. According to the display, he found that the projects were essential in the apocalypse, and each one belonged to the special category, clearly tailored for the post-apocalyptic world.

Although the prices were a bit expensive, it was nothing for David with his warehouse system containing thousands of various resources. He could easily produce hundreds or even thousands of items. If he wanted, the system\'s ten thousandfold critical strike ability would allow him to obtain more resources at any time. Coincidentally, he had been contemplating how to clear out some of the inventory in his warehouse, and the opportunity for base remodeling was presented to him. So David looked at each remodeling project and began to seriously consider his options.