"What is this...?" Xu Xin picked up the bottle of gray medicine.
Special tree house root potion (purple): Pour it under the tree house to promote the development of the tree house's roots. Each portion of potion can expand the tree house's protection range by three kilometers.
A purple potion! A potion that expands the protection range of the tree house!
Xu Xin's tree house's current protection range is three kilometers in radius. After using this potion, it will be expanded to six kilometers in radius! This is not only doubled, the protection radius has doubled, and the area has been expanded four times!
In other words, Xu Xin, who used this potion on his tree house, can now explore four times the area it is now! And within this expanded area, there might be another resource area.
Good stuff, really good stuff, worthy of being called a golden treasure chest.
Xu Xin picked up the thin card again.
Metal Products Automatic Unlock Contract (Purple): Unlocks all metal product recipes. After using this contract, all metal-related crafting recipes will be automatically unlocked as long as all types of raw materials are obtained.
Following the tree house renovation contract, he obtained another contract, a contract regarding the formula of metal products!
With this contract, Xu Xin is finally no longer limited to making stone tools!
Congratulations, you have opened three treasure chests: gold, silver and bronze. You have become the first person among the survivors to find and open all three treasure chests. The reward will be issued after the jungle exploration activity is over.
Survivors, please continue to work hard, strengthen yourself, and strive to live in this world.
The mysterious voice sounded again.
He is the first one to get all the treasure chests.
The event hasn't ended yet, and we don't know if anyone else will find the golden treasure chest.
To be honest, if Coco hadn't said there was a treasure chest below and insisted on pulling him down, with his cautious personality, it would have been impossible for him to get into this cave and dig out an underground passage.
The conditions for obtaining this golden treasure chest are really too harsh.
Xu Xin shook his head, not wanting to think about it, and looked at the contract in his hand and chose to use it.
Just like last time, the card representing the contract shattered in his hand and merged into Xu Xin's body. Xu Xin felt a surge of power flowing into every part of his body.
This time he not only felt stronger, but even his mind felt clearer. Everything he had just experienced was quickly sorted out in his mind.
First of all, that giant carnivorous plant should be the monster guarding the entrance to this underground world.
This abrupt iron room underground has been buried underground for many years just like the people in it, but no one knows where the extremely foul-smelling red mist in the room comes from.
The person in the room was not from this world, but he brought tools and food from his original world here, which meant that the way he came to this world was different from the survivors like Xu Xin. But Xu Xin couldn't figure out how he got here.
The golden treasure chest of this mission is tied to the secret of the underground space. The golden treasure chest should have been placed in this location intentionally. Anyone who discovers the golden treasure chest will definitely see the secret of this underground world before finding the golden treasure chest.
Those who cannot find the location of the golden treasure chest naturally cannot discover the secret.
Who is that mysterious voice? Why did they come to this world? Could it be that they were supposed to grow up and fight against the monsters deep underground
How did those monsters come into being? The size difference between them and the creatures on the surface is too big.
He thought of the giant anaconda in the center of the lake and the giant crocodile at the bottom of the stream. These two extraordinary huge creatures must have come from underground, and the area below the lake was probably a thousand meters underground.
There is also this potion in the gold treasure chest.
Xu Xin looked at the bottle of gray medicine in his hand. The whole bottle was only about 300 milliliters, and its weight was about the same as a bottled beverage.
The function of the medicine is to promote the development of the roots of the tree house and expand the protection range of the tree house. Does this mean that it is the roots of the tree house that protect survivors like Xu Xin from being harmed by underground creatures
A picture appeared in Xu Xin's mind.
During the two hours that the tree house grew, while the ground part of the tree house was growing, the roots of the tree house were also differentiating underground, extending in all directions, extending to three kilometers away.
The roots of the tree house are intricately spread underground, blocking any monsters that want to come out from underground. Once a monster appears, it will be sucked by the roots of the tree house and quickly turned into a dry and brittle specimen.
Therefore, when the roots of the tree house grow longer, the protection range of the tree house will become larger accordingly.
Xu Xin thought this explanation made sense.
This also explains why the mysterious voice repeatedly emphasized that the tree house must not be abandoned, because the tree house is the most powerful weapon and the greatest guarantee against underground monsters.
After figuring it all out, Xu Xin felt a little relieved. According to what the mysterious voice had said before, the monsters underground would not attack them at least in the near future, so they only needed to focus on dealing with the beasts on the ground.
The tree house will protect them.
Xu Xin put the golden treasure box into his backpack. Although the golden treasure box was made of gold and was very heavy, Xu Xin's strength was amplified several times and he was no longer the same. Combined with the backpack that reduced the weight to 20%, there was no problem carrying the treasure box on his back.
He was actually looking forward to what would happen after he collected all three treasure chests and assembled the pattern.
Before leaving, he decided to take another look at the underground world. After all, after he went out this time, he would not come back here for a long time.
However, Coco did not walk to the edge of the cliff like him, but lay down at the back, moving away from the cliff with some fear.
It was still the same scene of chaos and disorder.
There were gigantic monsters covered in seaweed, giant piranha plants that were several times larger than the ones on the ground, blood-red vines all over the ground, firefly-like creatures the size of cars, and some other giant animals and plants that could never appear on land.
These are the things he will have to face in the future.
He must improve himself quickly so that he has the ability to fight against these things!
Xu Xin looked forward and suddenly his eyes fixed.
At the top of the entire underground world, he saw many downward protrusions.
Now Xu Xin's position is equivalent to the lamp on the ceiling of the room, and those protrusions are other lamps.
"These protrusions should be the tree houses of other survivors, or the roots of the tree houses." Xu Xin thought thoughtfully.
According to his inference, the inside of these protrusions should be the intricate roots of the tree house, which are used to protect them, the survivors, from being disturbed by these underground creatures.
"Although I don't know who brought us here, he must be playing a big game."
Xu Xin took one last look at the underground world, then turned and walked back to the iron room.
The skeleton was still scattered on the ground. Xu Xin grabbed Coco, who wanted to go up to play with the ball, and pressed it on his shoulder.
"嘤!" Coco cried out somewhat dissatisfiedly, but still lay obediently on his shoulder.
The next task seems simple but it is not.
Climb up!
Looking at this deep passage, Xu Xin felt his legs trembling.
Just climbing down had made his arms extremely sore, and now he had to climb back up!
He even carries a golden treasure chest!
Tire him to death!
Xu Xin glanced at the little guy on his shoulder and asked, "Can you crawl by yourself?"
"Boo, boo, boo!" Coco shook her head violently.
"You're so lazy!"
"嘤!" Coco 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 before climbing up. After all, he had vomited everything he had eaten last night. Although the contract just now restored a lot of his strength, he had been down there for so long that he was afraid it would already be dawn up there and time to eat.
Just when he took out an apple and was about to take a bite, a hissing sound of air was suddenly heard beside him.
"What's that sound?"
Xu Xin turned his head warily.
As he looked on in horror, the half-open iron door suddenly closed automatically with a loud noise, and then a familiar red gas gushed out from the gap between the wall and the floor of the iron room, gradually spreading out.
“What the hell!!!”