After scrolling down the creation page, Su Mo mentally clicked on it and the list of materials popped up.

[Hunting Composite Crossbow: wood 0/8, iron blocks 0/8, copper blocks 0/4, nylon 0/2, composite nylon 0/1]

[5 matching crossbow arrows: Wood 0/2, iron blocks 0/1]

After unlocking the composite crossbow blueprint, the corresponding crossbow arrow blueprint came together and did not require Su Mo to look for it.

"I can easily get the iron blocks.

"Now, I just need the nylon, composite nylon, and copper blocks.

"I wonder if anyone has nylon. I'm sure copper blocks should be relatively easier to get."

While thinking and beckoning Oreo over, Su Mo walked back to the shelter.

When exploring the game panel, it was hard to focus on the environment around you, so when browsing the trading market, Su Mo would generally do so within the shelter.

When Su Mo was looking through the trading items last time, he came across many strange items.

When he searched this time, sure enough, there were copper blocks on the trading panel.

Currently, the price tag for a copper block was 100ml of water and nylon was not available at the moment.

"People are hiking up the prices way too much."

Su Mo browsed around and suddenly found that there were only two people selling copper blocks. Before he could buy a new copper block that was listed, the two had already been snapped up.

Those players were like game merchants, hoarding resources that were currently still in short supply. They would sit on the items and wait for the prices to go up.

"I think I'd better try and ask for it by offering my psychic energy water for the materials."

Su Mo pondered for a moment and listed up some options for trade.

[Seller: Su Mo]

[Trade item: 50ml psychic energy water]

[Request item: 1 copper block]

[Reserve: 200ml]

...

[Trade item: 100ml psychic energy water]

[Request item: Nylon*2]

[Reserve: 200ml]

...

[Trade item: 200ml psychic energy water]

[Request item: Composite nylon]

[Reserve: 200ml psychic energy water]

Many people did not consider the acid rain that was coming tomorrow to be a disaster. Some even thought of it as a supply.

Since that morning, the purchasing power of water had been decreasing.

Not only was that the case when trading for materials, but it was also that way for food, which was supposed to be its equivalent. The value of water was greatly reduced.

Fortunately, the purchasing power of psychic energy water was still strong.

Once he was able to get his hands on those materials, it was just enough to put together the material requirements for creating the Hunting Composite Crossbow.

When the order for copper blocks got listed, all four units were traded off in less than thirty seconds.

"My man, where do you get your psychic energy water? Don't worry, I'll give you 10 percent for every drop of it I get after you tell me your secret."

"The Almighty Su, I still have copper blocks. Please accept my exchange request. I haven't drunk water the whole day."

"Sir, I have nylon, but the price for the trade item isn't high enough, please increase it!"

"..."

It was one private message after another.

That was the nth time Su Mo had listed and sold psychic energy water, so almost everyone could guess that he had a fixed gold mine with a steady supply of water.

Most people bought psychic energy water not to quench their thirst.

Most of them basically stored it to be used as strategic medical supply. It would be useful in case they got injured since the psychic energy water might just save their life.

In the World Channel and Regional Channel, a large number of people started chatting again, discussing the two kinds of nylon Su Mo needed.

After probing around earlier, Su Mo learned that nylon was not a scarce item, it was just that some people were hoarding it in the hopes that its price would increase.

As Su Mo looked at the increasing number of private messages, he set the keywords for composite nylon and ignored everything else.

Since there was no immediate threat that was endangering his life at the moment, he did not need the composite crossbow yet, so he decided to slow down and wait until nighttime as there might be other people selling at a lower price.

After sorting by price, Su Mo acquired 50 units of stone again from trading and made up for the loss from making the drain previously.

After he took all the construction resources out slowly and stacked them in the shelter, Su Mo could not wait any longer.

Living in a wooden shelter was fine for the early period, but as time passed, wood would eventually lose its sturdiness one day. Therefore, it was not very safe.

After he gathered the materials needed to upgrade the shelter into a stone shelter, Su Mo did not wait any longer and began to upgrade everything.

The first thing to upgrade was the shelter's main door, which was also the first line of security in the wasteland.

[Shelter's Main Door]

Effect: Slight anti-theft, slightly radiation-proof.

First upgrade option: Increase the thickness of the wooden door, improves the hardness of the wood, slightly fireproof and waterproof (10)

Second upgrade option: Change the material, upgrade the wooden door to a stone door, durability and other properties substantially increase (5)

Comment: You wouldn't want to live in a doomsday world with a wooden door, would you?

When he clicked and selected the second upgrade option, there was a green light scanning over the building stones. After that, the ten units of building stones melted and turned into liquid stone as it attached itself to the wooden door.

After a short wait, the original wooden door disappeared and was replaced by a primitive-looking stone door.

When he unlatched the stone bolt and pulled the wooden stone door handle, Su Mo was once again surprised when he slowly pushed open the stone door.

The thickness of the stone door was more than 20cm. With such a thickness, it would be hard for even bullets to penetrate it. As long as he locked the door from the inside, people outside would not be able to break in even if there was a whole army.

Of course, that was assuming those people did not have explosives…

The workmanship outside the stone door was very crude. The system also paid attention to concealment during the upgrade. Although it still looked out of place in the wilderness, at least ordinary creatures would only think that it was a boulder.

After closing the door and going back into his base, Su Mo began to upgrade other things, one by one.

Each time the green light scanned, the originally wooden floor would undergo a radical change, turning into a light-gray stone floor.

After Su Mo finished upgrading his floor, he began to upgrade the walls and ceiling.

When the last piece of wooden object changed color, the shelter was transformed.

First, the change was in the interior.

There was no longer a feeling of dampness in the air and the dirt on the wood panels from days of activity had also disappeared.

At that moment, the ground became one neat surface. The entire body was light gray and since it was polished extremely smooth and flat, at first glance, it looked a bit like gray tiles.

At that moment, even the potholes that were originally there were filled up after the system's upgrade.

The stone color of the walls was a slightly rustic dark brown. From time to time, there were natural stone vein patterns so the shelter did not look too bland.

The ceiling above, on the other hand, was the same color as the walls which gave it a sense of unity.

"Not bad."

Su Mo looked around inside and outside. After that, he opened the full view of the shelter in the game panel.

[Personal Shelter]

Description: Shelter made of stone. Very strong with good security. Has a unique effect in isolating moisture and keeping warmth.

Space: 100㎡ (4.2m high) 

Level of Integrity: 100%

Facilities: Iron stove, bed, large scale vegetable culture medium, psychic energy well water extractor, dining table…

Introduction: Everyone is responsible for their own youth. Only you can build yourself a house in your youth. 

"This is the greatness of human civilization!"

Su Mo clapped and let out a long sigh. The biggest benefit of a shelter made of stone all around was none other than...

Security!

This was the level of security that everyone in the doomsday world was struggling for and it only took Su Mo four days to build it.

He walked around, touched everything, and looked at every corner. Su Mo sized up the renewed shelter and could not help but feel happy.

"Alas, if only there was electricity. Of course, this stone house would not be as comfortable as a steel-reinforced concrete house. When the time comes, I'll make sure to install a bathroom. No, a bathtub. I can watch my movies, drink a glass of wine..."

Su Mo looked at the ceiling, sat on the steps, and let his imagination run free.

After coming to this world, every time the environment in his shelter felt closer to what he had on Earth, Su Mo's thoughts became more and more complex.

From nothing to something, from the stone age to the electrical age, it took mankind more than five thousand years to develop everything.

A person's life expectancy was only a few decades at most, but in a doomsday world where everything was hanging by a thread, would there really be a day where they could get electricity?

Su Mo clenched his fist and moved the gloom in his heart to the back of his mind.

Right now was not the time to lament. He had not even traveled three kilometers away to the wilderness nearby, so he should not talk about the future for now!

After making an inventory of his supplies, at that moment, his psychic energy water reserves, excluding the 400ml he listed on the market, had gone back to about 2.5L.

Leaving 1L of water as backup, Su Mo began his last round of shopping before the day of the disaster.