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"Is this...artificial construction?" Lina looked at the silver-white metal wall in front of her in surprise. I don't know how long it took, but the silver wall seemed to be brand new, and the years seemed to leave no trace.

"It's obvious." Pennis shrugged: "I don't think it's naturally generated."

"Nonsense." Lina glared at Panis with anger, and approached the metal gate and observed: "Is this... the gate? Why is it sealed by metal? And there is no sense of incongruity, as if it was sealed when it was built."

"Yes, this is a door." Panis nodded.

"But why there is no door shaft or handle? How can such a door be opened?" Lina frowned and thought for a long time, then suddenly became stunned, and turned to look at Panis: "Do you know here? Otherwise, how do you know that this is the door?"

"I've seen similar buildings." Panis stood behind Lina, crossed his arms with his chest, gently touched his chin with one hand, and showed a look of memories on his face: "I've seen it twice a long time ago."

Lina's eyes lit up, curiosity broke out again, and she asked, "It's so good, what kind of building is this?"

Panis hesitated for a while before slowly answering: "Gogun Technology."

"What?" Lina's loud voice frightened herself and repeated in disbelief: "Gopin Technology?"

"Yes, the creation of the Goblin Age." Panis stretched out his hand and stroked the metal wall: "For about a thousand years, the construction of goblins was mostly in this form for about a thousand years."

"Is this actually a product of the Second Age?" Lina stretched out her trembling hand, imitating Panis's appearance, and stroked the building with a history of nearly ten thousand years in front of her.

The surface of the building is smooth and cold, with the unique touch of metal. Perhaps due to the influence of the psychological factors, when you touch it, you feel a sense of vicissitudes and sadness. Touching the cold walls, the metal seems to have taken Lina through time and space, and return to the era when the goblin empire was prosperous, the gods disappeared, and the creatures and mortals controlled everything. Under the sunlight, metal buildings stood on the earth, and on the streets paved with metal, countless crystal energy cars roared and flowed endlessly. On both sides of the street, there were crowds of people like water, and large green-skinned goblins were bustling and rushing. It was a world without gods and beliefs. Crystal energy, magic and technology were everything people had.

"It's hard to imagine such an era." Lina's words were confused: "I really want to see such a world with my own eyes."

Panis smiled very well: "When I first saw the goblin's architecture, I had this idea. But unfortunately, that era has passed, and now is our era."

Lina shook her head hard, tried to put aside the random thoughts in her mind, pointed to the door and said, "Then do you know how to open this kind of door that doesn't look like a door at all?"

"This kind of door is retracted into the wall to both sides, without a door shaft," Panis explained.

"To both sides?" Lina pressed the sides of the gap between the door and tried to the left and right, but there was no movement in the door: "How can I open this? There is no handle, and the metal surface is so smooth, how can I open it?"

"Well, it wasn't something that was opened by hand." Panis said helplessly: "Don't try, if you can't open it with brute force, their doors are all automatic."

"What is that? I don't understand at all." Lina rolled her eyes, feeling a headache.

"Let me explain it this way, the so-called automatic means that if someone stands in front of the door, the door will open automatically." Panis said: "That runs on pressure. There is a pressure sensor on the ground in front of the door. When someone stands up and applies enough pressure, the door will open automatically."

"Okay, I understand if I say so." Lina nodded: "But I have been standing in front of the door for so long, why isn't the door open? Is it because I'm not heavy enough? Well, this is good news."

"Don't be prouder than goblins." Panis sighed: "There are three types of automatic doors, one is two-way automatic, one is one is one is one is one is one is one is one is one is one is one is one is one is one is one is one is one is one is full manual."

"Can you take the initiative?" Lina said with her lips curled, "Let's explain it directly."

Panis continued to accept his fate: "Bidirectional automatic means that there are pressure sensors on both sides. No matter which side a person stands in front of the door, the door will automatically open. One-way automatic means that there are pressure sensors on one side. For people on the other side, this door is locked. If you want to open it, you must use a special key. And completely manual means that there are no sensors on both sides, and you need a key to open the door."

"What is the key?" Lina grabbed the point sensitively.

"Longyu." Panis said: "Dragonyu Lock is a specialty of goblins. Each door corresponds to a specific person and a specific pronunciation of dragonyu. Even if you know the dragonyu that opens the door, it is useless not to be a fixed person."

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

"This is the power of knowledge, you don't understand." Panis gave Lina a thumbs up and smiled.

"I will let you know, I will let you have strength." Lina gritted her teeth and stared for a moment, until the corners of Pannis's mouth twitched, and then she took back the foot that was stepping on him.

"In fact, these are mostly unknown knowledge, and only scholars know it." Panis thought for a while and continued, "I guess Vivian should know some of it. Not only these, but almost all the goblins that have been published have been studied in all aspects."

"But why haven't I seen it before?" Lina was puzzled: "Is anyone restricted it?"

"No, you have actually seen it, the Crystal Locomotive Magic Motion Locomotive is a replica of Goblin Technology." Panis explained in detail: "But most Goblin Technology cannot be copied."

"Why?"

"With the same capacity, goblin technology has ten times the utilization of crystal energy that we have for crystal energy, and the energy storage technology is dozens of times that we have." Panis pointed to the metal wall and said, "People cannot explain the reason at all, they can only guess. The mainstream guess now, the main reason for this gap is the material. The metal smelting technology of goblins back then is incomparable to us. Their metals can't be analyzed at all, let alone copying them."

"That's a pity." Lina sighed regretfully and suddenly realized: "After talking for so long, it actually means that this door is locked and cannot be opened, right?"

"Even if locked, it can be cracked brute forcefully. As for the door, the meaning of existence is to make people break it." Panis shrugged, not in a hurry at all: "And, this door should not require violence, it should be a one-way automatic door."

"How do you know?" Lina found that she was no different from a fool today. She asked countless times how did you know.

"Look at this place." Panis squatted down at Lina's feet and pointed to the ground.

"Many claw marks." Lina also squatted down and saw deep scratches on the rocky ground in front of the door: "Is this what monsters caught?"

"Yes, the size is exactly the same." Panis compared the claw mark with his hands: "And it is a new mark, no more than five days at most."

"What does this have to do with one-way automatic doors..." Lina suddenly stopped halfway and suddenly realized: "I understand, you think they accidentally activated the pressure sensor from inside and opened the door, and they can't go back after they come out."

"Yes, that's what I guess." Panis clapped his hands and said, "Looking at the direction of these claw prints, they are all left in the door, and it looks like they are desperately pushing into the door."

"You said this, it's really like this." Lina nodded: "So, are their real nests inside?"

"It's possible," said Penis. "But, in a building, with their size, the food source is absolutely impossible to satisfy them, how can they grow so big?"

"What's the use of thinking so much?" Lina pulled the squatting Panis up: "You'll know if you go in and take a look? Didn't you just say that you can open the door without a violent breakthrough? Open it quickly."

Panis lay on the door, put his eyes on the thin slit in the middle of the door, and looked inward: "If it is really a one-way automatic door, then you only need to add a certain amount of pressure to the sensor inside, and the door will open automatically."

"I know this too." Lina stood aside with her hands behind her back as she watched Panis busy: "The question is, how can we add pressure to the sensor inside from outside the door? You can't dig a hole, if you dig a hole, there is no need to open the door."

"It's not possible to dig a hole. The foundations of the goblins are all metal, and the holes cannot be digged in." Panis left the door and shook his head: "So, it takes some small skills."

"Is the lock-picking skill?" Lina teased, "I can't tell that you are also a part-time thief."

Panis smiled, searched in 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 Panis. She watched Panis tear off a piece of one meter long from a roll of gauze and put the gauze onto the door, and asked, "Is this going to stuff the gauze in?"

"If you can't plug it directly, the gap is not straight, but a tooth-shaped cross." Panis's fingers intertwined with his hands, and used a gesture to make a metaphor: "So if you plug it directly, you can't plug it in. However, if you use a little bit of energy control, it will be different, for example, this is the case."

As Panis said, he held the hand holding the gauze in front of him. The soft and thin gauze stood upright in the air under the infusion of precise control of the fighting spirit. In Lina's ghost-like eyes, the upright gauze started from the top and slowly bent back and forth in a right angle, finally forming a tooth-shaped interlaced shape, and still standing upright in the air.

"Look, just like that, you can stuff it in." Panis smiled slightly and flicked the erect gauze, which did not shake at all under the bounce.

"This energy control." Lina grinned and sighed: "It's really a hell."

Panis shook the gauze straight again, slowly stuffed the top into the gap, and pushed forward tentatively little by little.

"Well, when I encounter the first corner, go left, okay, go right, immediately go right, shout, then go forward, very well, go right, Oh, it's over, go left, go left, go forward." Pennis muttered, while pushing the gauze in very cautiously, with his expression focused, without blinking.

For ten minutes, Panis maintained the same posture, and the gauze in his hand gradually became shorter and shorter. Finally, Panis's eyes lit up, he let go of his hands and moved his body, and then grabbed the gauze again: "I finally got in. Let it touch the ground. This is very simple. Look, it has already touched it. Then, in the end, apply pressure and open it for me."
Chapter completed!