Doomsday: with unlimited warehouse system

David reached out his hand towards an iron rack nearby, simultaneously silently chanting the word "Decay" in his mind.

Suddenly, David felt a flicker in his mind! An inexplicable power surged from within his body to his fingertips. This power was surging and seemed to carry a hint of malevolence as it headed straight for the iron rack.

"Hiss~" A piercing sound instantly resounded as white vapor emanated from the iron rack upon contact with David's hand. Then, the iron rack began to rapidly decay, as if it had been doused with some kind of chemical. In less than a minute, the steel pipe, which was originally as thick as a child's arm, turned into a puddle of black iron liquid.

"What the... This ability is too terrifying, isn't it?" David exclaimed in astonishment as he looked at the iron liquid on the ground. He didn't expect this skill to be so brutal, capable of instantly corroding and decaying even iron objects. If he encountered some low-level zombies, they would have been reduced to a pool of rotten blood long ago.

Suddenly, David felt delighted. With this ability, he would save a lot of energy when dealing with low-level zombies. When he unleashed this ability just now, he could clearly feel that the energy consumption was minimal.

However, the power was incredibly potent. For an ability user, it was the most efficient ability. After all, in combat, besides abilities, an ability user's stamina was the most crucial factor. It determined the duration and efficiency of an ability user's fights, enabling them to hunt more zombies and protect themselves.

After searching the laboratory and finding no other energy sources to extract, David opened the spatial gate and walked out. Little Black, who had been squatting at the door, wagged its tail and barked happily when it saw David coming out.

"Little Black, I've had quite the harvest today!" David reached out and rubbed Little Black's head, excitedly saying.

Little Black seemed to understand David's words once again and jumped up excitedly. David walked out of the building, and then he got into an off-road vehicle.

"Did you find anything inside?" Sally, who was in the passenger seat, asked while caressing the sleeping Cola in her arms.

"I didn't find anything, just an empty building." David didn't mention the laboratory or the fact that he had upgraded to a Level 7 ability user and acquired another attack-type ability.

Seeing David's calm expression, no one suspected anything. So, David started the car, stepped on the gas pedal, and headed towards the base. Upon reaching the base, David parked the car and then arrived at the entrance of the base. Other people, exhausted from the battle, went inside to rest and replenish their stamina.

Little Black also followed Cola and slowly walked inside. Seeing that there was no one around, David began to survey his base. Although the base had already been upgraded to a black iron base, with significantly improved defense and concealment, David felt unsatisfied.

Living in a world full of constant crisis, David had to make his hiding place even stronger. So, he summoned the defensive crystal. Looking at the shiny triangular crystal in his hand, a thought flashed through David's mind. He decided to see if he could use it to upgrade his base's level and directly called upon the system in his mind. "System, how many defense-type crystals are needed to upgrade the black iron base to a bronze base?" David inquired.

[Ding! Answer, host!]

[To upgrade the Black Iron Base to Bronze Base level, it requires twenty Defense Crystals!]

[To upgrade the Bronze Base to Silver level, it requires thirty Defense Crystals!]

[The host can continue in a similar manner for subsequent upgrades.]

Listening to the voice of the system, David nodded silently. After the hundredfold critical strike, he now had 100 Defense Crystals in his storage. This meant that he could only upgrade the base by three levels to the Gold level at most. However, David didn't plan to spend all the Defense Crystals because, strictly speaking, these crystals were of medium rarity. It means they could not only enhance the defense of buildings but also provide support to vehicles and even the human body.

Without hesitation, David spent twenty Defense Crystals and upgraded the Iron Base to the Silver level.

[DING! Congratulations to the host for upgrading the Black Iron Base to the Silver Fortress!]

[Defense Crystals are rare, so only dozens are required for upgrades.]

The voice of the system quickly resounded in David's ears.

At the same time, David looked up at the base in front of him. Suddenly, a silver light flashed through the void, quickly enveloping the entire base. Under the coverage of this silver light, the Base emitted faint ripples of energy waves in the void, and its overall color continuously changed. From the initial dark color, it transformed into a more concealed and dark shade, resembling the night.

Even standing right in front of it, David couldn't sense the presence of the base at all. At the same time, he felt an invincible force emanating from within the base.

"So, this is the Silver-level base? It's amazing!" Sensing this penetrating power, David couldn't help but marvel. With the existence of a Silver-level base, he believed that the defensive strength of their team's shelter would greatly increase, ensuring the safety of the team members.

Among their group, both David and Arnold possessed abilities that had some defensive capabilities. On the other hand, Duke, Sally, and Sophie were pure mages and relatively vulnerable. Thus, their own defensive capabilities were naturally weaker. With the protection of the Silver-level base, their defensive power would indirectly improve. Seeing the successful upgrade to a Silver-level base, David decided to test its effect on the human body.

He took out another crystal from the storage and began to absorb it. A white aura slowly emerged from the crystal and quickly penetrated David's body through his skin. Immediately, David felt as if an extremely powerful force was surging within him. Gradually, this force permeated from his body to his skin, forming a thin energy shield on the surface.

Although the energy shield was thin, David felt as if he was wearing a thick suit of armor. Even if he were to be hit by a bullet, it probably wouldn't break through. Moving his body, David also discovered that the energy shield was as smooth as silk, not hindering his movements at all. Now, David was thoroughly delighted.

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