The journey to the center of the swamp is not difficult or easy. Yun Na drove the Shang Shang all the way forward, but from time to time broken tree trunks floated in the swamp, or marsh creatures such as crocodiles and baby fish jumped out to stop her from moving forward.

These things should be the second obstacle besides the poisonous swamp. But this is completely trivial to the LV50 stone murderer. She skillfully shook the oar made of tree branches, and from time to time she used the front o-gland brake, which not only moved forward smoothly, but also grabbed a lot of marsh animals and stuffed it into her backpack.

All the way to the center island, Yun Na leaped from the back of the merchant and onto the land. After looking back, she found that the trader was floating on the surface of the swamp next to the land in a bit of anguish, looking unscathed, and had no intention of running away.

Yun Na let go. She turned around and started to collect the moongrass that grew on this small piece of land. There are many moonglow grasses on the ground, and even if a small piece of grass on the ground is lighted up, as long as you go to another place and collect it, the original bare ground will refresh the grass when it is invisible. So Yun Nai became more and more vigorous. After all, in the end, 50 trees were needed for Zhushi, and at least 99 trees were reserved for herself... But when she was bent down to gather moongrass intently, a gust of wind suddenly heard behind her.

System reminder: [Pumping Tree (LV40) has challenged you]

Yun Na dodged swiftly, avoiding what was slamming from behind. When she turned her head and looked intently, she found a strange tree that had been quietly standing in the center of the swamp at the moment, and its branches were dancing fiercely at her.

Smoke a tree? What is this? Isn't it true that Harry Pottery's species accidentally came to the wrong place?

However, Yun Na looked at the system prompts and found that this thing was indeed called a human tree, not a human willow. Although this strange tree has long branches, it doesn't look like a willow tree...

This should be the last obstacle to collecting moonglow grass. It is not difficult for Yun Nai of LV50 to avoid a tree of LV40. But gathering Moonglow while dodge seems to be a difficult task. At the same time, Yun Na found that the Moonglow Grass that had not been collected on the ground was pulled down a few branches of the human tree, and it was scattered all over the place. Perhaps because it was not collected correctly, the rotten Moonglow will no longer be refreshed.

How does this work! Yun Na bit her teeth, and simply no longer resisted, letting the twigs of people "shoo" on her body, and quickly collected the moonlight grass on the ground.

[System prompt: The tree of human draw (LV40) launched a normal attack on you, your HP-30]

Yun Na had to take out a grilled fish from the bag and hold it in his mouth, collecting moongloss frantically. But seeing that Yun Ling did not resist, he seemed to be more energized to draw the human tree, and the branches snapped off for a while, and Yun Ling's blood trough instantly lost more than two hundred points of blood.

However, at this moment, Yun Na saw that the Moonglow in his backpack had finally reached the target number, and he snapped the grilled fish bones in his mouth with a "click".

"Hmph, I can't teach you in order to gather moongrass. Do you think you are the boss?" She grinned gloomily, equipped with curry sticks, and walked towards the tree of people.

All the branches of the Smoking Tree gave a slight pause, and then launched a more violent attack towards Yun Nai. However, Yun Nai's eyes condensed, and the sword in his hand drew a blue shadow.

"Water Breath·Four Type·Flowing Dancing!"

"The breath of water, the shape of one, the water surface is flat!"

"Water Breath·Seven Types..."

As the blade passed, the notes of the tree that had drawn people were chopped down by Yun Na. About five minutes later, there was only a bare tree trunk in front of Yun Na, which looked very pitiful. And Yun Na stood on the spot carrying the curry stick, and took out a cake with the other hand to eat blood.

After swallowing it three times five times two, the system prompts that Yun Nai's HP has returned to full. She burped contentedly.

[Defeat the tree of drawing people (LV40), experience value 8100]

[Items Obtained: Draw the branches of the human tree×1]

【Items Obtained: Money×270000】

I got the branches of the human tree... I don't know what use this thing is. Yun Na picked up the branches on the ground and looked at the system's instructions.

[Branches of the human-drawing tree: The branches that grow from the human-drawing tree in the center of Moonlight Swamp. It can be planted on a plane of any material, and it will grow into an adult tree of humans within half a minute. 】

Is it useful to plant this stuff? Yun Na thought for a while, but put the branches into the backpack.

The remaining Moonglow Grass was twisted and twisted by the branches in the battle just now, and it is estimated that it will not be refreshed in a short time. Yun Na regretfully picked up the money and prepared to leave, but Yu Guang suddenly saw that after the branches of the smoking tree were chopped bald, a dark concealed tree hole appeared in the trunk.

[System prompt: You found a tree hole that draws a human tree. There seems to be something in it. Do you want to find it? 】

Yun Na hurriedly walked to the trunk of the smoking tree, staring eagerly at the tree hole. The tree that has lost all its branches at this moment naturally does not have the ability to resist Yun Nai. Squinting and squatting in front of the tree hole for a while, Yun Na finally found that there was something in the tree hole.

Feeling too dangerous to reach in, she took out a branch from her backpack and plunged into the tree hole. After groping for several times, she picked out the contents of the hole.

That is a golden key.

The system promptly jumped out: [Get the key to the tower where the sage lives. 】

…what?

Yun Na was wondering if this was the tower mentioned by Shih Zhu before he set off? However, at this moment, she suddenly noticed that the ground beneath her feet began to tremble slightly. At the same time, the black swamp was bubbling like a boiling pan.

Tanjirou, who was still on the shore of the swamp, seemed to be yelling worriedly at Yun Nai, but their voices were quickly engulfed by the loud noise in the swamp. The vibration under the feet was more obvious, almost making people stand unstable. The mud in the swamp slapped on the central land, and the splashed mud pips occasionally caused 1 HP damage to Yun Nai. Yun Na had to drag up the merchant who was still floating in the swamp, holding the merchant as a shield in one hand to block the splashing mud, and the other hand tightly holding the smoking tree with only the trunk left, not letting go.

And with this shock, something giant burst out of the swamp and stood in front of a few people. After the mud flowed down, the whole picture of the giant finally appeared in front of everyone-it was a five-story stone tower.

Under the moonlight, the huge shadow of the stone tower completely covered the small piece of land in the center of the swamp, and even the debris of the moonglow grass that exuded the blue light was much dimmed in the shadow.

After a while, the commotion finally stopped. The merchant rubbed the muddy water on his body uncomfortably. Yun Na straightened up and had to eat another rice ball. While eating, she placed her palms in front of her brow bones, looking at the tower floating out of thin air in the swamp.

System prompt: [Because of the induction that the key has found the owner, the tower of the sage has appeared. 】

No wonder Zhu Shi said that this tower is hard to find. The target that needs to be found is not the tower itself, but the key needed to step into the tower. After finding the key, the tower will show up. I'm afraid the people who went to look for the tower got the wrong idea.

But I always feel that the tower emerging from the mud of the swamp is not fairy at all...

Yun Na thought this way, looking up at the top of the tower until her cervical spine was a little bit sore. It is said that there are omniscient sages living on the tower, who can answer any questions. She thinks this is an important opportunity. Maybe she can get extremely precious clues for customs clearance, which can not be missed in vain. So she jumped on the merchant again and headed towards the marsh shore. Crossed off.

Perhaps because of the appearance of the tower, the driftwood, crocodile, and baby fish that hindered Yun Nai disappeared completely, and the return journey was calm and calm. After arriving at the shore of the swamp, Yun Nai jumped down to the merchant, and was immediately surrounded by Tanjirou and the others.

"Wow, it's terrible, what's the matter with that tower!?"

"Is that huge thing a mountain god! Can you compete with him!"

"Isn't it hurt? Has the moonlight grass been harvested?"

Yun Na had no choice but to stop the trio's babble and talk about what happened after he arrived at the central land.

"Do you still remember Miss Zhu Shi said that the sage on the tower can answer all the questions? It happened to find the key this time. Let's go up to the tower and ask the sage to ask questions!"

Yun Na felt that the opportunity was indispensable, and he simply wanted to go together, so that even if the stove door you beans bite on the bamboo and can't speak, they can ask the sage four questions in total.

After listening to her plan, Tsuihiro Inosuke immediately agreed, and my wife Zenizu hesitated. It was Tanjiro Chiamon who seriously raised a question.

"Of course it is the best if possible. But how are we going to get there?"

Yun Nai said that this is not easy? So I patted my chest and packed the ticket: "Let's go to the dealer!"

Tanjirou was silent for a moment: "Actually, I just wanted to say, is it too much to step on the merchant in the past?"

"Uh…"

"Uncle Trader himself may not be willing." The boy said solemnly, and he helped the merchant up with worry, "Fortunately, it's okay..."

[Favorite degree of Tanjiro at Kanomon-3]

Is it because you don't agree with her approach, so you lose your favor? But we are all in trouble, this profiteer will be fine! Yun Na was anxious, ran to the other side of the trader and said, "No, all this is done to defeat the ghost dance Tsuji Wu miserable and save mankind. Compared with the great goal, this small sacrifice is nothing, you say Right, the trader", while secretly poking the trader's arm.

"Ah... um..." Facing Yun Nai's moral kidnapping, the merchant nodded pitifully, like a yellow cabbage in the ground.

"Eh, really?" Tanjirou Chiamen was a little surprised. There was hesitation on his face, but in the end he was persuaded by Yun Na, "Then if the merchant thinks it is okay..."

—He really agreed.

Two minutes later.

"Charge, towards the mountain god, the pig is advancing by leaps and bounds!"

"Don't squeeze, you are about to squeeze me down!"

"Inosuke, you stepped on the head of the merchant! Uncle merchant, are you okay?"

"No, nothing..."

"..."

The four people squeezed and stepped on the backs of the little merchants, having to grasp each other's clothes or hook each other's arms to prevent them from falling off the merchant, their posture was like a few peas in a pod. Yun Na distributed two branches to everyone, planning to row under the tower as if they were rowing a dragon boat together. But perhaps because of the uneven power, the merchants wandered around the swamp for a long time, only then reluctantly and slantingly approached the tower.

Stepping on the steps of the stone tower, and then handing out a rice ball and a grilled fish as a gift to the merchant waiting outside, Yun Na took the three people to the heavy door of the stone tower and found that there was indeed a keyhole on the door. And the shape and size are the same as the key she got from the hole in the human-pumping tree.

Pushing the key into the keyhole and turning it around, Yun Hao immediately heard the rumbling sound of the machine. The heavy doors of the stone tower slowly opened towards both sides, and Yun Na could see the wide space inside the tower.

At the same time, after opening the door, the key still inserted in the keyhole turned into a fragment of light and dissipated.

[You used the key to open the gate of the tower of the sage. Lost key×1]

It seems that this key is a one-time use. Yun Na was staring at the empty keyhole, and suddenly heard a voice coming from the tower.

"Adventurers, congratulations on being here." The voice was strong and powerful, and it sounded like a middle-aged old man said, "As long as you can reach the fifth floor, you can get any question from the sage. s answer."

Although the system determined that this was indeed the tower where the sage lived in the legend, Yun Nai still did not take it lightly. She stopped the friends who wanted to go in, took out five porcupine carcasses equal to the number of people from the bag, and rolled towards the door.

The porcupine carcass rolled to the center of the hall, both in weight and size, meeting the requirements of "five people". Yun Na stared at the porcupine carcass, seeing that there was no movement for a while, and no mechanism was triggered, so he walked in the door cautiously.

Tanjirou and others followed behind and entered in file. But when he entered the door, Tsuihiro Inosuke suddenly stopped and turned back abruptly.

"What's wrong, Inosuke?" Tanjirou Chiamon asked curiously.

"Just now...it seemed to feel that something was peeping at us." The pig head probed his head and looked out. "I grew up in the mountains, and I was very sensitive to my sight, and the skin I saw would get a little hot. I can't be wrong!"

Yun Na remembered that there was a line of sight perception in Inosuke's special kill skills, and hurried to the door to look around with him. But one person and one pig watched for a long while, and he didn't even see his personal shadow, nor did he find the names of the people marked by the system when the characters appeared in the plot.

"Is it a small animal?" My wife Zenyi asked, standing behind the two of them, "What Inosuke could perceive in the mountains before is the sight of an animal? It doesn't matter if it is looked at by an animal. "

Zuihei Inosuke hesitated: "Or, maybe..."

But even if Dutou himself hesitated, Yun Na, who was cautious, would not have any fluke psychology. But it is not realistic to leave now. Now that it was determined that the tower was safe, she simply pulled the mouth Hira Inosuke back, and then closed the door heavily to cut off all sight from the outside.

After that, Yun Na led the team all the way to the end of the first floor, while not forgetting to pick up the porcupine again and stuff it into the backpack.

Walking all the way forward, the area originally shrouded in dim shadows gradually became clear. After passing through a vast space, a group of people discovered that the end of the space turned out to be a dead end.

Just when five people (including the stove door Nidouzi in the box on the back of Tanjiro Tanjiro) were facing the wall and thinking about life, the wall suddenly "clicked", revealing a flat stone slab with inscriptions.

A line written on the stone board impressively: "Knowledge can only be gained by giving knowledge. If you want to continue climbing the tower, please solve the following questions."

It turned out to be an answer to a question to pass the level. Only after answering the question correctly can I get the opportunity to ask the sage? Yun Na was taken aback for a moment, then calmed down.

This kind of quiz can't trouble her. Generally speaking, the answers to the questions in RPG are often simple questions like "what creature has four legs in the morning, two legs at noon, and three legs at night".

Thinking about this, Yun Nai confidently chose to answer the question, and then the words on the stone slab quickly changed, forming a new line of words.

"How to determine the ground state of a quantum system without an exact solution?"

"..."

Yun Na repeatedly read the title several times, dumbfounded.

Is this a question type that appears in a normal RPG? Is the person who asked the question sick? This kind of question cannot be answered without scholar LV9!

Yun Na complained loudly in his heart, stood stupidly in front of the slate for a long time, and finally remembered to see the reactions of his friends. Unexpectedly, she looked from left to right, and found that Tanjirou and others were thinking hard, and they didn't know whether it was true thinking or fake thinking...

However, after waiting for a long time, these people did not respond. When trying to talk to them, the system will still appear [Teammate Tanjiro Sanamon is thinking about the answer, and it seems that he hasn’t noticed you, so I should wait for the problem to be solved before trying He talks to a kind of reminder. So Yun Na was convinced that they were all fake thinking, but in fact they didn't think of anything in their minds. Especially the pig’s head, he didn’t even recognize the Chinese characters at all, so he pretended to think about the quantum mechanics problem...

It seems that the teammate is just a decoration, and she has to rely on herself to solve the problem...

After hesitating for a while, Yun Na tried to guess: "5?"

Slate made no response.

"The square of x?"

"0?"

"The root number 2?"

No matter how guessed, the slate did not respond, and the stairs did not appear. Unsao tried to take out the curry stick to attack the stone slab, and wanted to see if he could pierce the stone slab and make a path like smashing Yushiro's Mujirou wall. But the system quickly popped up a prompt: [Slate cannot be attacked].

Standing helplessly in front of the stone slab for a while, Yun Na thought to himself that he might really have to give up this time. But at this moment, the system suddenly jumped out a kind prompt.

[Are you stumped by the question of going through the level? The sage living on the tower has enabled the payment function, so why not try the service that pays to skip this question! Note: This service is only open when the holdings of funds exceed 50 million. 】

Can I skip it? Although I felt that this was not a wise man, Yun Nai immediately chose the skip function.

[The price for skipping the first level question: 200,000 yuan/person, would you like to purchase the service for skipping this question for yourself? Y/N】

Sure enough, it costs a lot of money to skip the topic. Why even the test of the sage is so realistic... Thinking of this, Yun Na sighed.

Although she felt that 200,000 skipping once was quite expensive, she still chose to agree with the thought of being able to ask any questions to the omniscient sage.

The money fell by 200,000 in an instant, and at the same time the system jumped out of the pass prompt. The sound of the mechanism turning came from the corner on the side. Soon, a stone staircase extended down.

Yun Na raised his leg and walked towards the stone stairs. After walking a few steps, he suddenly found that something was wrong. She turned her head and saw her friends staring at her eagerly.

"It's great, Yun Na has solved such a difficult problem, so I can go up!" my wife Shanyi exclaimed, rubbing her face, "I want to go up and see what a sage is like!"

"Don't be like this, Shanyi, there is nothing we can do if you can't solve the problem." Tanjirou comforted the door, but his eyes looked at Yun Nai with a little envy and regret.

…Isn’t it enough to just cheat and skip? Yun Na stood there hesitating for a few seconds, but finally ran back because of conscience, poked the slate, and chose to pay the money for all the friends.

[The price for skipping the first level question: 200,000 yuan/person, for whom do you want to purchase the skipping question service? 】

[Zaomon Tanjiro]

[My wife Zenyi]

[Mouth Flat Inosuke]

【Kamamon Nidouzi】

Yun Na selected all the options and lost another 800,000 in an instant.

Although the pain felt like cutting meat when giving the money, fortunately, after paying the money, the four people's favorability towards Yun Na increased by 20. And now everyone can continue to climb the tower.

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