In front of the deepest stone gate, the vice principal had a casual expression but actually took out some detection equipment and swept it in front of the stone gate.

"There's nothing out of the ordinary, it's just an ordinary stone door, but it's not very easy to open." The vice principal withdrew the equipment with some confusion, it shouldn't be so simple to hold such an existential thing, compared to the bronze doors and corpses outside, this place like a single cell is too simple.

"Traps?" Lu Mingfei proposed a possibility, the magic fluctuations coming out of it would not be fake, but this ordinary stone gate was like attracting people to enter.

"Quite possibly." The Vice Principal nodded, "But even if it's a trap, we'll have to go in and see it." ”

"The bombs have been prepared, and it has been calculated that they will not cause the underground palace to collapse or spread to the surface, just in case we have reinforced this place." The sub-chief replaced the dragon's breath spray gun and said to him, he was a little disappointed that he didn't teach the corpse guard a lesson.

The stone door, which is nearly ten meters high, has no handles, and seems to have been opened by dragons with brute force or special means. Unable to know what was going on inside, they decided to blow up a small hole first, observe the situation and structure inside, and then make a decision.

"Then let's get started, be careful to keep your people on guard, and once something comes out, shoot with Frigga bullets first, and then shoot with live ammunition after confirming the target." The vice-principal instructed him to shoot with a tranquilizer bullet first just to see if he could capture it.

When ready, they retreated to the improvised fortifications made of steel plates in the corridors. After all the long guns and short cannons were set up, the vice principal nodded to the branch minister.

Seeing that everyone had evacuated the stone gate, the demoman pressed the button in his hand.

"Bang!" There was a small explosion, but it was felt by everyone present, and a small hole was blown open in the corner of the stone gate.

The commissioners looked nervously at the small opening, and the long guns and short cannons were aimed there. After waiting for a while, there was no movement, and someone approached with a drone and transmitted the image of the interior of the room.

Lu Mingfei sent the shadow servant over when the drone approached, and when he saw the situation inside, he showed a surprised look.

The vice-principal also saw the inside of the stone door through the monitor, and the back of the stone door could not be called a room, because this was a natural cave, so natural that there was no trace of any man-made objects.

"Empty?" The branch minister said in surprise, he had imagined that there would be a dragon inside that would be weak or fierce and roaring at them, no matter how bad it was, there should be some corpses, and the empty room seemed to laugh at their caution just now.

Lu Mingfei shook his head and reminded: "It's not that there is nothing left, listen carefully." Through the Shadow Follower's scouting, he could see more things, such as an underground river deep in this small cavern.

"The sound of water." Zero faceless reminded that she successfully squeezed in front of the monitor through her height advantage, so she could hear it clearly.

"Underground river?" The vice principal looked at the river that was photographed by the drone, "Open the door and go in first." ”

After confirming that there was no danger inside, the commissioners directly took out the cutting machine and began to cut according to the gap that was blown out, and soon an opening that could be passed by normal people was cut out. The branch minister first took a few people in, and only after confirming the surrounding environment did he let Lu Mingfei and the vice principal in.

The cavern was close to the underground river, and the air was much cooler than the hall outside. However, everyone present was a half-blood, and the temperature did not make them feel any discomfort.

The cavern wasn't very large, about the size of the hall of the temple outside, except for the moss and other plants that grew on the surrounding rock walls, and there was only the underground river.

"That's not the only place where prisoners are kept, right?" The branch minister approached the vice-principal, who was thinking about something, "Could there be something hidden by some mechanism or alchemy?" ”

The researchers who came in later began to collect environmental data in the combat commissioner's protective circle, and were surprised to find that the plants attached to the rock wall were quite old species, very different from the current ones.

After the researchers informed the vice-chancellor of this discovery, the vice-chancellor let out a long sigh and said as if relieved: "No other intelligent beings have entered or exited the underground palace in the past three thousand years, and the temple that exists as a prison. Nibelungen...... I have finally found you! ”

After hearing the vice principal's muttering, the other researchers who came in all raised their heads in surprise and looked at the figure in front of them who could be called an alchemical milestone. Does that legendary holy place really exist? Still here?

"Is this true, Vice Chancellor?" A researcher from the Alchemy Department stepped forward to ask, and the other researchers looked at him as well. The commissioner of the executive department, who had not heard of this concept or was still a scumbag in school, continued to guard and search the place.

The vice principal looked around the cave with deep eyes, and said in a solemn tone: "I don't know." ”

The expressions of the researchers who were expectant froze, and some of them wanted to have a seizure but were hindered by the identity of the person in front of them, so they endured it, and only the person who asked the question just now continued to ask: "Then why did you say that, vice principal?" ”

The vice principal's expression returned to laziness and took out the wine jug, and when he found that it was gone, he took it back again: "What other reason can you come up with besides this explanation?" ”

Lu Mingfei nodded secretly, the vice principal's guess might be true. He had discovered the magic disorder since he entered, and although it was not as large as the one he had encountered on the viaduct in his hometown, it was not to be ignored.

It was also because of this magic disorder that he interfered with the connection between him and the Shadow Servant, so that he had to incorporate the Shadow Servant into his shadow with a special technique, so as to avoid falling into chaos due to the loss of control of his magic power. This disorder may not have any effect on the true Servant, but it is still a bit dangerous for the Shadow Servant who can barely manifest in the realm.

And the source of this magic disorder, or the place where the magic disappeared, he could see without testing, was the underground river.

Hearing the Vice-Chancellor's explanation, the researchers went feverishly to find the possible entrance to the Nibelungen. For such a place, even the vice-principal would lose his temper, let alone them.

But the vice principal quietly came to Lu Mingfei's side, and while there was no one around, he asked in a low voice, "How is it, do you feel anything?" ”

Lu Mingfei was the only person they knew had been there, and the vice-principal thought he might have sensed something.

"Hmm." Lu Mingfei nodded, and came to the underground river, where Zero and another researcher collected water samples.

The underground river is not too deep, and because of the desertification of Mesopotamia, only less than three meters of water is still flowing in the otherwise wide riverbed, and it is not knee-deep. This is also caused by the magic disorder, otherwise the river would have dried up long ago.

The vice-principal also followed, looking at the groundwater thoughtfully.

"Did you find anything?" Lu Mingfei came to Zero, who was squatting by the river, and asked, the researcher had already taken samples and left, and the searchlight equipment he brought was also taken away, only Zero was squatting at the slightly dim water's edge and didn't know what to think.

Zero retracted her gaze from the reflection in the water that she couldn't see very clearly, but never grew up, looked at Lu Mingfei, who was more and more similar to someone in her memory, and said, "It's nothing, let's go back and help, useless people will be left behind." ”

Lu Mingfei was a little surprised why she would say such a thing, but she also fell silent after the words "You have to live well and always be useful to me" sounded in her heart, and she also looked at her reflection in the water, not knowing what she was thinking.

"Let's go back." Lu Mingfei turned around and said, there are too many people here now, and it is not easy for him to use magic to enter inside.

Zero also stood up, patted the hazmat suit that had been dragged to the ground because it was too big, and turned to leave together.

But what none of them noticed was that in the river below, a pair of golden eyes opened. The monster underneath stretched out its long tongue to Zero, who was facing away from it, through the same color skin and dark cover as the river bottom.

Lu Mingfei quickly turned around, and the black key that had generated a blade under the protective suit was thrown directly at the guy lying on his stomach under the water. The magic disorder in the cave disturbed his perception to a certain extent, but when the things in the water moved, there was still a little movement, and he didn't have time to pull out the village rain, and he touched the black key that had been hidden and threw it out.

After discovering Lu Mingfei's movements, Zero also took out his pistol and shot backwards without aiming while turning backwards.

Although their attacks all successfully hit each other, Lu Mingfei's black key did not hit the opponent's vital point, and the ordinary blade generated with magic power did not cause much damage to the opponent. Zero's bullets were also hindered by the water, although a few bullets also hit the opponent, but they were blocked by the opponent's hard skin, and did not damage the underwater monster.

And the underwater monster has a dense sucker tongue that is now wrapped around Zero's feet, trying to pull her into the river.

As soon as Zero aimed at the protruding part of his tongue and wanted to shoot, he was pulled backwards by the force coming from under his feet. She threw away her pistol, pulled a black spur from her sleeve, crouched down and slashed at what was wrapped around her foot.

But she underestimated the strength of the underwater monster and overestimated her own weight. Before she could make a move, she was dragged into the water.

Lu Mingfei, who had already pulled out the village rain, also wanted to slash at the thing that was wrapped around her under her feet, but Zero was pulled and slipped under his knife, for fear of accidentally hurting someone, he grabbed Zero's hand that was still on the water, and wanted to lift her up to see the location of the thing before using the knife.

Zero, whose head was above the water, wanted to say something to him, but when Lu Mingfei, who couldn't hear it because of the sound of the water, took Zero's hand and stepped into the water, he didn't step on the riverbed under his feet, but fell into the water with Zero as if he was stepping into the air.

……

The commissioners who were still exploring the cave rushed to this side after hearing the gunshots, and the vice principal closest to the river rushed to the river first, but they only saw Lu Mingfei holding Zero's hand and sinking into the river that could only drown their knees, and they didn't even move before they could even pounce.

"I see! I understand! It's water! As if he had thought of something, the vice principal rushed to the place where Lu Mingfei had disappeared, and jumped in with a large vertical stride and an unsightly movement.

When the commissioners arrived at the river, they saw the vice-principal standing alone in the water that had only submerged half of his knees, with an expression on his face that he should not have been.

The vice principal didn't believe it and took two steps deeper into the water, but even if he reached the deepest part of the water that only drowned his knees, he couldn't get there as he thought, and Lu Mingfei and Zero were long gone in the water.

"I'm at the door......" He stood in the water a little distracted, ignoring the commissioners who had also jumped down to search for Lu Mingfei's traces.

"I'm already at the door, can you stop me?" The vice-principal threw himself into the water with a somewhat hideous expression, trying to find a possible entrance to it.

……

Lu Mingfei felt weightlessness for a while and then smashed to the ground that looked like dry, he was still holding Zero's hand in his hand, and Mura Yu in the other hand had already let go when he felt weightless, he was now holding one hand on the ground and trying to stand up, and with the other hand holding Zero trying to confront the monster who was also pulling her on the other side.

Then he felt someone hit him, and he was half up and fell to the ground again, and the man behind him was still holding his waist to make it difficult for him to move. He remembered that when he was about to fall into the water, it seemed that someone had grabbed him by the waist, as if he wanted to pull him back, but it seemed to have fallen down with him.

The person holding him let go of his hand, and Lu Mingfei heard a sound of footsteps and a sound like a long knife being drawn, and then he held Zero's hand lightly, as if the thing holding Zero had been cut off.

After confirming that Zero was out of trouble, Lu Mingfei turned over and jumped up, touched his hands under the protective suit, and two black keys appeared in his hands. This is made of materials that he transferred from the alchemy department with the identity card of the school director in the school, counting the original one, there are seven in total, but the ones that were made later are better than the previous ones because of the materials, and it was the original one that he threw out at the beginning.

The blade was generated, and Lu Mingfei rushed towards the huge toad monster that was fighting with a black sword-wielding figure, and the body of the toad was about to catch up with the size of a lion, no wonder Zero would be easily dragged by it. The black keys on the back of the toad monster were still swaying slightly with its movements, and then it was pulled out by the black figure and copied in his hand, and he also slashed at the toad monster with a knife in both hands.

The huge toad's body was like a natural target, and Lu Mingfei also threw a black key at the toad from a little distance, hitting one of its eyes directly. The newly made black keys were canceled by Lu Mingfei because of the sufficient number of black keys, in exchange for a more stable sword body and penetrating power.

The toad monster screamed after being hit, and the black figure also found the opportunity to directly stab the toad monster's other eye.

After the toad monster was blinded in both eyes, it was stimulated by the severe pain and began to go berserk. Lu Mingfei stopped and took out the pistol inside the trench coat to shoot, and the bullet easily hit the big toad with greatly reduced flexibility.

The black figure was also forced back by the crazy toad monster, and stood aside and took out the pistol behind his waist to shoot, but he seemed to be using just ordinary bullets, which was not too useful for a toad monster the size of a lion just lying on his stomach.

Stimulated by the pain again, the toad monster bowed and jumped up, trying to escape, but because of the injury, it didn't jump high. As it was about to fall, a figure stood up directly below it.

Zero slashed off her tongue that was still wrapped around her feet, and slid her feet on the ground directly below the direction of the toad monster's escape. When the toad monster jumped up, he also stood up, raising his thorn and slashing through the toad monster's weak abdomen.

The toad monster fell down and lay behind Zero twitching, and when he saw a large amount of dark red blood flowing out under it, Lu Mingfei put down the pistol he was holding at it, and turned around to look at the black figure who had also put down the pistol.

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