（263...... 084...... 458...... Book friend skirt, if you want to come, join the group. P.S. Friends who have passed by ask for collections and recommendations, and your support is my biggest motivation. In addition, it is good for everyone to give more opinions, thank you. PS2: The title of the book has been changed, please see the work related)

The sudden appearance of extremely deep pits in the earth is commonly known as the traces of the earth, and in recent centuries, scholars have been studying the traces of the earth. Unfortunately, such research often yields nothing, and the causes of the Traces of the Earth are not even fully understood.

Some scholars believe that the traces of the earth are due to the erosion of the underground river, which causes the limestone underneath to be continuously dissolved to form an underground cavity, which eventually leads to the collapse of the stratum after accumulation, and the collapsed rock is slowly washed away by the underground river, and finally forms the trace of the earth. This theory was initially sought after by scholars, who generally acknowledged its correctness until dwarven scholars joined the study.

The first thing the dwarven scholars did when they joined was to overturn this mainstream perception, and they listed four large potholes with hidden locations, these four ancient earth traces were not at all like people imagined, in fact, there was no limestone inside them, and there were no underground rivers within four or five hundred meters of three of the potholes, and the only one that existed in the potholes, the dark rivers were diverted through this place after the potholes appeared. The appearance of these four craters has pushed the progress of the study of the traces of the earth back to the original stage, and scholars can only start again.

The Traces of the Earth, located in the interior of the Glittering Forest, are shallow in depth, small in scope, and small in number, and are not necessary to be studied in the eyes of scholars. In fact, too, there are no plants, no animals, no notable finds, just seven simple pits. However, I am afraid that no one would have imagined that inside one of these seven pits, there is a treasure that has been accumulated by a kingdom for many years.

"Sure enough, both of these potholes met the screening criteria we envisioned. Vivien sat at the bottom of the fifth crater, looking up at the sky with her knees folded, silently simulating the trajectory of the moon in her heart: "It seems that there should be a third condition." ”

"Hey, have you seen it? Catherine's head poked out from the top of the pit and shouted below, "I'll pull you up when I'm ready." ”

"Sister, wait a while. Vivien puffed up and shouted, "We guess it's going to be a while, and when we're ready, I'll call you with the Resonance Crystal." ”

"Watch out for falling rocks above your head. Catherine instructed uneasily: "Don't stay too long, if there is any problem, you can come up and discuss it again." ”

"Yes, yes, Granny Catherine. Vivien waved her hand impatiently, "We're going to start researching, goodbye." ”

"Actually, she nagged because she cared about you. "Of course," said Pannis, "though it may be in her nature." ”

"I know, every time she nagged me, I was actually very happy, hehe. Vivien covered her mouth and chuckled: "Eldest sister, she also knows that when I say that, she is just joking, and she will not take it seriously." Alright, alright, get the map out and study it. ”

"Come, here. Pannis found a flat ground and unfolded the map that he was about to memorize: "I think there must be a third clue." Without a third clue, we would not have been able to find the entrance to the treasure room. ”

The map is not complicated, it is a cross-sectional drawing similar to a sketch, the four walls of the pit are completely replaced by straight lines, and the bottom of the pit is drawn with simple lines to close to the perfect circle, and at the top of the pit is a three-moon light poking its head out of the hole and sprinkling moonlight into the hole. In the center of the crater is a puddle of clear water, and the moon in the sky is reflected on the surface of the water.

"Wait. Vivien suddenly grabbed Pannis's sleeve: "It's this pool of water." ”

"Hmm, is this a pool of water?" said Pannis, touching his chin and nodding his head distractedly, "It's possible." ”

"Right, get rid of the clues you've found. Vivien's eyes lit up and she danced and said, "The only thing that may have a clue is this pool." I guess it's probably necessary to create a waterhole here that is illustrated in the size range, and then see if you can see if you can see how the waterhole can be reflected in the map. ”

Pannis didn't speak, he looked up at the sky and was silently distracted, his feet turning back and forth in the center of the crater, and he simply calculated the position in his heart.

"You can't do that. Vivien waved her hand and said, "I'm afraid a simple calculation is useless, it needs a very precise position, if I'm not mistaken, I'm afraid it will not work at all." ”

"That's troublesome, it's a lot of work. Pannis sighed in distress and said helplessly: "First of all, the ratio of height to diameter on the map is ten to three points eight seven five, the height of the rock wall here is actually one hundred and seventeen meters, and the average diameter is about forty-six meters, so the ratio should be ten to three .93, if you take into account the accumulation of sand and dust in seven hundred years, this result is within the range of eligibility." Then, with a diameter of 46 meters and a ratio of 10 to 3.875, the height of that year should be 118.7 meters, that is, we have to dig down to a depth of nearly two meters to restore the height of the waterhole at that time. ”

"Wait, wait. Vivien suddenly tugged at Pannis's collar and shouted loudly, "I see, I finally get it." ”

"What do you understand?" Pannis, wiping away his cold sweat and asking tentatively, "Are you sure you're okay now?" ”

"Nonsense. Vivien gave Pennis a blank look, and began to circle the bottom of the pit with her head up, turning her head around as she went, looking at the position of the moon in her imagination. After going around several times, Vivien finally clapped her hands, pointed to the rock wall in front of her and said, "Come and do me a favor, carry me up twenty or thirty meters, slower speed, I want to take a closer look at the rock wall." ”

"Is it here?" Pannis, looking up at the rock wall for a moment to make sure there was enough support to climb on, picked up Vivien on his back, jumped high and began to climb upwards.

"Slow down here. Vivien suddenly shouted, "Slow down, slow down, I want to see carefully." ”

"This great Miss Mage. Pannis smiled wryly and muttered, "The slower this kind of thing is, the more difficult it becomes, especially since I'm carrying a person on my back." ”

"Stop, this is it, stop. Vivien slapped Pannis's shoulder and exclaimed, "That's right, this should be it." ”

Pannis was prepared, climbing the gap in the rock wall with one hand, taking out two iron drills with the other hand, inserting them into the cracks of the rock wall to fix them, holding the iron drill with both hands, and hovering in mid-air with both feet on the bump on the rock wall, and carrying Vivian to her shoulders by the way.

"My speculation may well be correct. Vivien almost put her eyes on the rock wall, stared at the bare rock wall for a few minutes, and then said with satisfaction: "Pannis, you are a professional, you come to see here to determine if there are any artificial traces." ”

"Artificial?" Pannis's hands rose with the help of his body, reaching Vivien's original height, and after only looking at it for a few seconds, he said with certainty: "That's right, there are indeed traces of artificiality, only such a very small area has such traces, and there are no other places." ”

"Whew, that's right. Vivien breathed a sigh of relief and patted Pannis's arm: "It's hard work, you can go down." ”

Landing on the ground and putting Vivien down, Pannis couldn't wait to ask, "How did you find that position?"

"It's simple. Vivien said, "Because I guessed how they controlled and activated this entrance. ”

"Can you guess that?" said Pannis, looking at the confirmed location on the rock wall, "Oh, it was a reflection of light." ”

"Yes, light reflection. Vivien replied with a smile on her face: "Using the surface of the water as a reflection to reflect the moonlight of the blue moon to the target point, because it is the night of the mana tide, while reflecting the moonlight, it will also transmit the huge active magic energy contained in the moonlight to the control device hidden behind the rock wall, so that the control device is activated." ”

"Then through this small control switch that is activated. Pannis consciously continued: "Can you use it to control the real gate switch, activate the stored energy and make the gate appear?"

"That's it. Vivien clapped her hands and laughed, "I'm really a genius, and I've found the key point so easily." ”

"So, this genius miss, can you please explain it a little more clearly to us mortals?"

"Ahhhh Suddenly a voice sounded from behind Vivian startled Vivian: "Big sister Lina, when did you two come down?" ”

"When. Lina tapped her fingers to her lips, a gloating smile on her lips: "Not long after someone screamed at someone else's tail." ”

Then I saw two fools climbing up the rock wall without any protection. Catherine sneered and said, "Do you think you're related to the rock lizard, or do you think you can fly down a cliff like a bat rat?"

"I was wrong. Pannis decisively admits his mistake: "Don't dare anymore." ”

"yes, yes, don't dare anymore. Vivien also nodded her head with a pitiful expression on her face.

"I'm really scared of you. Catherine rubbed her head in pain and lamented, "You two guys get together, it's useless to say anything, forget it, pay attention next time." So, now is it time to confirm the location of the entrance?"

"It's not a confirmation yet. Vivien immediately put aside the pitiful appearance she had pretended to be just now, shook her head and said, "Now it can only be regarded as preliminary confirmation, and further verification is needed, after all, we must be fully prepared." ”

"How do you know for sure?" asked Catherine.

"As Pannis said before, first calculate the center point and specific range of the waterhole in the picture, then dig a pit more than 1.7 meters deep, so that the water level is at the position of 1.7 meters down, and then test whether the waterhole can form the reflection of the illustrated image, and calculate whether the moonlight can be accurately refracted to the target point. Once that's done, you'll need to go to another suspected target's pit and do the same test again to make sure you don't make any mistakes. ”

"It's so troublesome. Lina wailed, "I'm going to dig a pit again." ”

"I can't help it, I have something to do in the next few days. Vivian shrugged, she would definitely not be allowed to do these manual labors anyway, so there was no psychological pressure at all: "For the treasure, work hard, girl, hahahaha." ”