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"It's ...... Artificial structure?" Lina looked at the silver-white metal wall in front of her in surprise. I don't know how much time has passed, but the silver walls still seem to be brand new, and the years seem to have left no traces.

"It's obvious. Pannis shrugged, "I don't think it's naturally generated." ”

"Nonsense. Lina glared at Pannis, leaned over to the metal door and took a closer look: "This is...... Why is the gate sealed with metal? And there is no sense of disobedience, as if it was sealed when it was built. ”

"That's right, it's a door. Pannis nodded.

"But why don't you have a hinge or handle, how can such a door be opened?" Lina frowned and thought for a long time, then suddenly stunned, and turned her head to look at Pannis: "You know here? How else do you know this is the door?"

"I've seen similar buildings. Pannis stood behind Lina, arms folded over her chest, one hand gently touching her chin, and a look of remembrance on her face: "I saw it twice a long, long time ago. ”

Lina's eyes lit up, and her curiosity flared up again, and she asked, "Great, what kind of building is this?"

Pannis hesitated for a moment before slowly replying, "Goblin Technology." ”

"What?" Lina's loud voice startled herself, and she repeated in disbelief, "Goblin Technology?"

"Yes, a goblin Age creation. Pannis stretched out his hand and stroked the metal wall: "From the sixth millennium to the seventh millennium of the Second Age, most of the buildings of the goblins were in this form for about a thousand years. ”

"Is this a product of the Second Age?" Lina stretched out her trembling hand, following the example of Pannis, stroking the nearly 10,000-year-old building in front of her.

The surface of the building is smooth and cold, with the unique touch of metal, perhaps because of the influence of psychological factors, when the hand touches it, I actually feel a burst of vicissitudes and sadness. Touching the cold walls, the metal seemed to carry Lina through time and space, back to the time when the goblin empire was at its peak, when the gods were hidden and the living beings were in control. Under the sunlight, metal buildings stand on the ground, and on the metal-paved streets, countless crystal energy vehicles roar back and forth. On both sides of the street, there are crowds of people, and large areas of green-skinned goblins are bustling and hurrying. It was a world without gods, without faith, and that crystals, magic, and technology were all that people had.

"It's hard to imagine a time like that. Lina's words were blank: "I really want to see that kind of world with my own eyes." ”

Pannis smiled understandingly, "When I first saw the goblin building, I had this idea. Unfortunately, that time has passed, and now is our time. ”

Lina shook her head vigorously, trying to put aside the cranky thoughts in her mind, pointed to the door and said, "Then do you know how to open a door that doesn't look like a door at all?"

"This kind of door is retracted into the wall on both sides, and there is no door hinge. Pannis explained.

"To both sides?" Lina pressed the two sides of the gap in the door to the left and right, but the door did not move: "How can this be opened, there is not even a handle, and the metal surface is so smooth, how can it be opened?"

"Well, it wasn't meant to be opened by hand. Pannis said helplessly: "Don't try, you can't open it with brute force, their doors are automatic." ”

"What's that? I don't understand at all. Lina rolled her eyes, feeling like she had a real headache.

"To explain it this way, the so-called automatic, which means that if someone stands in front of the door, the door will open automatically. "It runs on pressure, and there are pressure sensors on the ground in front of the door, and when someone stands up and applies enough pressure, the door opens automatically," Pannis said. ”

"Well, I'll get it when I say that. Lina nodded, "But I've been standing in front of the door for so long, why hasn't the door opened? Is it because I'm not heavy enough?" ”

"You're more important than goblins, don't be complacent. Pannis sighed: "There are three types of automatic doors, one is two-way automatic, one is one-way automatic, and one is completely manual. ”

"It's better for you to take the initiative yourself. Lina pouted and said, "Just take the initiative to explain." ”

Pannis continued: "Two-way automatic means that there are pressure sensors on both sides, and the door will open automatically no matter which side the person stands on in front of the door. One-way automatic means that only one side has a pressure sensor, and for the other side the door is locked, and a special key must be used to open it. And completely manual means that there are no sensors on both sides, and keys are required to open the door. ”

"What's the key?" Lina sensitively grasped the point.

"Dragon's Language. Pannis said, "The dragon lock is a goblin specialty. Each door corresponds to a specific person and a specific dragon pronunciation, even if you know the dragon language that opens the door, it is useless if you are not a fixed person. ”

"Wow, how do you know so clearly. Lina asked in surprise.

"That's the power of knowledge, you don't understand. Pannis gave Lina a thumbs up and grinned.

"I give you knowledge, I give you strength. Lina gritted her teeth for a moment, until the corners of Pennis's mouth twitched, and she retracted the foot that had stepped on his feet.

In fact, this is a kind of obscure knowledge, which is generally only known to scholars. Pannis thought for a moment and continued, "I guess Vivien should know a little bit about it. Not only these, but almost all the goblin artifacts that have come out have been studied in all aspects. ”

"But why haven't I seen it?" Lina wondered, "Is there someone restricting it?"

"No, in fact, you've also seen it, the Crystal Locomotive Magic Motor Car is a replica of Goblin Technology. Pannis explained in detail: "But most goblin technology can't be replicated. ”

"Why?"

"With the same capacity of spar, Goblin Technology's utilization of crystal energy is ten times that of us, and the energy storage technology is dozens of times that of us. Pointing to the metal wall, Pannis said, "People can't explain the reason at all, they can only guess." Now the mainstream conjecture, the main reason for this gap is because of the material, the goblins' metal smelting technology back then is incomparable to us, and their metal is now impossible to analyze the composition, let alone copy. ”

"That's a shame. Lina sighed regretfully, and suddenly reacted: "After talking about it for a long time, it actually means that this door is locked and can't be opened, right?" ”

"Even if it's locked, you can brute force it, the door, the meaning of existence is for people to break. Pannis shrugged, not in a hurry at all: "Moreover, this door should not require violence, this should be a one-way automatic door." ”

"How do you know?" Lina found herself no different from a fool today, and asked countless times how do you know.

"Look here. Pannis crouched down at Lina's feet, pointing to the ground.

"Lots of paw prints. Lina also squatted down, and saw deep scratches on the rocky ground in front of the door: "These are those monsters?"

"Yes, exactly the size. Pannis compared the paw prints with his hand: "And it's a new one, no more than five days at most." ”

"What's the ...... with a one-way automatic door," Lina said halfway through a sudden pause, and suddenly realized: "I see, you think they came out of the door by inadvertently activating the pressure sensor from the inside, and they can't go back after coming out." ”

"That's right, that's what I estimated. Pannis clapped his hands and said, "Look at the direction of these paw prints, they are all left behind facing the door, and it looks like they are desperately squeezing into the door." ”

"When you say that, it really looks like that. Lina nodded, "So, their real nest is in there?"

"Possibly. "But how can they grow so big in a building that is completely impossible for them to be fed with food sources for their size?"

"What's the use of thinking so much. Lina pulled the squatting Pannis up: "Wouldn't you know if you go in and have a look?" Didn't you just say that you don't need a violent breakthrough to open the door, open it quickly." ”

Pannis leaned on the door, put his eyes on the slit in the middle of the door, and looked in against the door: "If it is really a one-way automatic door, then it only needs to add a certain amount of pressure to the sensor inside, and the door will open automatically." ”

"I know that, too. Lina stood with her hands behind her back and watched Pannis busy: "The question is, how can you add pressure to the sensors inside from the outside of the door? ”

"You can't dig a hole in the ground, the goblin building, the foundation is all metal, and you can't dig a hole in the ground. Pannis left the door and shook his head, "So, a little skill is needed. ”

"Lock-picking skills?" Lina teased, "I don't know, you're also a part-time thief." ”

Pannis smiled, rummaged through his backpack for a while, and finally reached out to Lina, "Give me gauze." ”

Lina took out the gauze for bandaging and handed it to Pannis, watching Pannis tear off a meter-long piece of gauze from a roll of gauze and put the gauze on the door, and couldn't help asking, "Is this to stuff the gauze in?"

"If you can't plug it directly, this gap is not straight, but toothed cross. Pannis's fingers were interlocked, and he made a metaphor with a gesture: "So if you plug it directly, you can't stuff anything." However, with a little bit of energy manipulation, it's different, for example. ”

Pannis said as he held his gauze hand in front of him. The soft thin gauze, under the precision control of the infusion of fighting energy, stands straight in the air. In Lina's ghostly eyes, the upright gauze began at the very top, and slowly bent back and forth in a right-angled shape little by little, until finally formed a tooth-like staggered shape, and it was still standing upright in the air.

"You see, that's it, it's going to be stuffed in. Pannis smiled slightly, and gently flicked the erected gauze, and the gauze did not shake at all under the bullet.

"This energy manipulation. Lina grinned and sighed, "What the hell." ”

Pannis shook the gauze straight, slowly tucked the tip into the slit, and tentatively pushed forward, little by little.

"Well, the first corner, left, okay, over, right now, whew, then forward, good, then right, oops, it's over, down to the left, then left, forward. Pannis muttered as he pushed the gauze inward very cautiously, his expression so focused that he didn't blink his eyes.

For ten minutes, Pannis maintained the same position, and the gauze in his hand slowly became shorter and shorter. Finally, Pannis's eyes lit up, he let go of his hand and moved his body, and grabbed the gauze again: "Finally got in, the next thing is to let it touch the ground, this is very simple, you see, it has already been touched." So, in the end, put pressure on me and open it for me. ”

With Pannis's last yell, the closed metal door snapped to the sides, revealing the space behind the door.