The Golden Treasure Chest, Pondering

"This is ...?" Xu Xin picked up the grey medicine.

[Custom Treehouse Root Potion (purple): Pouring it under the treehouse can promote the growth of the roots of the treehouse. Each dose of potion can expand the protection range of the treehouse by three kilometers.]

A purple-grade potion! And it was a potion to expand the protection range of the treehouse!

Xu Xin's current treehouse's protection range was three kilometers, but after using this potion, it would expand to six kilometers! This was not only double. The radius of protection would double, which means the area would be expanded four times!

In other words, if he used this potion on his treehouse, he could then explore four times the area! In this expanded area, there might be another resource area.

A treasure, it was really a treasure, as expected of a golden treasure chest.

Xu Xin picked up the thin card.

[Metal Items Automatic Unlock Contract (purple): Able to unlock all production formulas of metal items. After using this contract, all metal-related production formulas will be automatically unlocked as long as the raw materials are obtained.]

After the treehouse modification contract, he obtained another contract, a contract regarding the formula for metal items!

With this contract, Xu Xin could finally make something other than stone tools!

[Congratulations, you have opened the gold, silver, and bronze treasure chests. You are the first survivor to find all three treasure chests and open them. The reward will be given after the end of this jungle exploration event.]

[Survivor, please continue to work hard, strengthen yourself, and work hard to survive in this world.]

The mysterious voice sounded again.

He was the first person to obtain all the treasure chests.

The event was not over yet, and he wondered if anyone else would find the golden treasure chest.

To be honest, if Cocoa hadn't insisted on pulling him down and indicating that the treasure chest was here, he wouldn't have entered the tunnel and dug an underground tunnel with his cautious nature.

The conditions to obtain the gold treasure chest were simply too harsh.

Xu Xin shook his head and decided not to think about it. He looked at the contract in his hand and chose to use it.

Just like the last time, the card representing the contract shattered in his hand and integrated into his body. Xu Xin felt a wave of energy flowing through his body.

This time, not only did he feel stronger, but he also felt that his mind was clearer. Everything that he had just experienced was quickly sorted out in his mind.

First of all, that huge man-eating flower should be the monster guarding the entrance to the underground world.

This abrupt iron room had probably been buried for many years like the skeleton in the room. He still couldn't figure out where the extremely stinky red mist in the room came out of though.

The skeleton in the room was not from this world and had also brought tools and food from his original world. This meant that the way the other party came to this world was different from the way Xu Xin and the other survivors had come. Though, he still could not figure out how he and the other party had come to this world.

The golden treasure chest was bound to the secret of the underground space. It should have been placed here on purpose. Anyone who found the golden treasure chest would definitely see the secret of the underground space before finding it.

Those who could not find the location of the golden treasure chest would naturally not be able to discover this secret.

Who was that mysterious voice? Why did he bring them to this world? Could it be that it was for them to grow and fight against the group of monsters deep underground?

How did those monsters come about? The difference in size between them and the creatures on the surface was too great.

He thought of the python in the center of the lake and the giant crocodile at the bottom of the stream. These two unusual creatures must have come from the underground, and the lake was most likely connected to the underground.

There was also the potion in the golden treasure chest.

Xu Xin looked at the bottle of grey medicine in her hand. The entire bottle was about 300ml, about the same weight as a can of drink.

The effect of the potion was to promote the growth of the roots of the treehouse to expand the scope of protection. Did this mean that the roots of the treehouses were protecting Xu Xin and the other survivors from the underground creatures?

An image appeared in Xu Xin's mind.

During the 2 hours when the treehouse grew back then, its roots also divided and extended in all directions to 3 km away.

The roots of the treehouse were densely arranged underground, blocking the monsters that wanted to come out. Once a monster appeared, it would be eaten by the roots of the treehouse and quickly become a dry and brittle specimen.

Therefore, when the roots of the treehouse grew longer, the protection range of the treehouse would increase correspondingly.

Xu Xin felt that this explanation made sense.

This also explained why the mysterious voice had repeatedly emphasized that they must never abandon their treehouses, because the treehouses were the most powerful weapons and the greatest protection for the survivors against the underground monsters.

After thinking through all this, Xu Xin's mood relaxed a little. According to the mysterious voice, the underground monsters wouldn't be attacking them any time soon. They only needed to focus on dealing with the beasts on the surface for now.

The treehouses would protect them.

Xu Xin put the golden treasure chest into his backpack. Although the chest was made of gold and was very heavy, his strength was no longer the same as before after being enhanced several times. Coupled with the backpack that had reduced the weight of the items to 20%, the chest was easy to carry.

He was quite looking forward to what would happen after he gathered all three treasure chests and pieced them together.

Before he left, he decided to take another look at the underground world again. After all, he would not be back here for a long time after he left.

However, Cocoa didn't walk to the edge of the cliff like him. Instead, it sprawled on the ground behind him and kept its distance from the cliff in fear.

It was still the same chaotic scene.

There were giant monsters covered in seaweed, giant man-eating flowers that were several times larger than the man-eating flower on the ground, blood-red vines all over the ground, and firefly-like creatures the size of small carts, as well as some other giant plants and animals that couldn't possibly appear on land.

These were all things that he would have to face in the future.

He had to quickly improve himself so that he had the ability to resist these things!

Xu Xin looked forward and his eyes suddenly narrowed.

He saw many protrusions at the top of the underground world.

His current position was like a light on the ceiling, and the protrusions were the other lights.

"These protrusions should be the treehouses of other survivors, or the roots of the treehouses," Xu Xin was deep in thought.

According to his deduction, the inside of these protrusions should be the intricate roots of the treehouses, used to protect the survivors from the invasion of these underground creatures.

"Although I don't know who brought us here, he must be playing a big game of chess," Xu Xin took one last look at the underground world, before turning around and returning to the metal room.

The skeleton was still scattered on the ground. Xu Xin grabbed Cocoa, who was about to play with the skull like a ball and put it against his shoulder.

"Yin!" Cocoa yelped in dissatisfaction, but it still obediently lay on his shoulder.

The next task seemed simple, but it was not.

To climb up!

Looking at the dark tunnel, Xu Xin felt his legs tremble.

Just climbing down had already made his arms extremely sore, and now he had to climb up!

He was even carrying a golden treasure chest!

He would be exhausted to death!

Xu Xin glanced at the little guy on his shoulder, "Can you climb on your own?"

"Yin, yin, yin!" Cocoa shook its head violently.

"You're so lazy!"

"Yin!" Cocoa wanted to retort. The distance between each step was almost as long as its body. How could it climb?

Sighing, Xu Xin decided to eat something first before climbing up. After all, he had vomited all the food he had eaten last night. Although the contract just now had allowed him to recover a lot of energy, he had stayed down there for so long that it was probably already dawn up there. It was time for him to eat.

Just as he took out an apple and was about to take a bite, he heard a hissing sound of air being released.

"What's that sound?" Xu Xin turned around warily.

In his horrified eyes, the half-open iron door suddenly closed automatically with a loud bang. Then, a familiar red gas gushed out from the gap between the iron room's wall and floor, gradually spreading.

"F*ck!!!"