"There are spatial nodes in the gray field, and this should be noted. "The appearance of goblin scholars did not surprise anyone. Catherine had long since become accustomed to the old professor's flickering style and his tireless penchant for quirky note-taking.

However, it is rare that this time the old professor did not forget to ask questions while writing hard.

"Do the spatial nodes in the gray field conform to the specular conjecture between relative spaces?" is a question that is quite in-depth and has certain academic value.

But the old professor really asked the wrong question. And the object of his question was Catherine, who was anxious about Feeley. He stood solemnly in front of Catherine and solemnly repeated the question.

Catherine only had a wry smile, if the gust of wind could blow the undead away, she would do it. For the first time, Catherine felt that goblins were annoying creatures—no, annoying undead.

In fact, Catherine didn't know that after hearing the goblin scholar's question, except for the absent-minded Fishuang and the always smiling Lady Vicie, the other five executive committee members in Corner City exchanged glances with each other imperceptibly.

"Old man, we don't have time to talk nonsense with you. Ace didn't give up his attempt to enter Mosi Town, he waved his hand rudely to drive away the goblin scholar, "Catherine, you put a fireball and see if you can throw it in." ”

Catherine knew it didn't make sense, but she followed As's words and unleashed a fireball spell in front of Ferry Phys. The fireball flashed, not flying towards Ferry at all, but following an arc trajectory and disappearing into the darkness in the distance. Fee, who was sitting on the ground, did not notice the slightest sign, his face was very pale at the moment, and his lips squirmed a few times from time to time, as if he was praying.

"At the height of the Goblin Civilization, Professor Twelve Toes, the chief scholar of the Goblin Academy, came up with a famous conjecture. What would two goblins see if they were to stand on opposite sides of the space node connecting the opposite space at the same time. Twelve toes assert that only one goblin can see their companion on the other. "No one expected that Lady Visy would suddenly answer the goblin scholar's question," said the twelve toes, and the analogy of a goblin came to a calm lake on a sunny day, and he stood on the shore to see if there were any fish in the lake. Unfortunately, the goblin could only see the sky and himself reflected on the lake. A fish in a lake, on the other hand, can easily see goblins standing on the shore of the lake looking down. The twelve toes are used to illustrate why the goblins on one side of the spatial node can't see each other. Because the spatial node reflects the projection of the space in which the observer is located, it follows that the observer cannot see the spatial node itself either. ”

This passage from Mrs. Visy is a fairly classic mirror theory in the study of space. This is also one of the most prestigious theories left by the goblin civilization to this day. For a long time in history, both realm and space have been considered worlds that can only be touched by gods. And the goblin civilization is definitely not a civilization known for magic. Therefore, when Twelve Toes proposed this theory, he himself had no way to prove it experimentally. So much so that for a long time, this theory has been called the mirror conjecture.

Even today, there are still many scholars in the Academy of Magic who call the mirror theory the mirror conjecture. Because of one of the sufficient conditions of this theory, "standing on both sides of the space node at the same time" to observe, has not been possible. One of the reasons is that in a certain side of the space node, that space node cannot be observed.

Of course, most scholars believe that the fact that it cannot be observed just shows the correctness of specular reflection. But the opposition also argues that it cannot be observed, or that it does not exist. There are even bolder scholars who deduce that the mechanism of spatial nodes actually exists only in one side of the space.

Catherine was annoyed that at such a critical juncture, she would still be distracted to think about the various academic differences in mirror theory. Although Catherine and her teacher, Quisling, had little knowledge of space magic, as history buffs, mirror theory, and the twelve toes, the scholar with the strange name, left them with a valuable question to study. As a goblin who had never touched the realm or space in his life, how did he get the inspiration for this classic conjecture?

Because this conjecture is one of the most important historical evidence about the flourishing period of the goblin civilization. It shows from one side the academic splendor that civilization that has been obliterated by history.

"Catherine, don't be flustered. Ace grabbed Catherine's shoulder and shook it, "There's no time to think about it right now, you'd better think of a way to get us back to Mosus." ”

As soon as As's words fell, there was a "bang", and a round axe whistled through the window. "Bang-", the round axe was nailed forcefully to the wooden wall behind Ferry and most of the axe sank into the wall. If Ferry hadn't sat on the ground, he would have been split in half by a round axe.

Ferry was so frightened that he cried out "ouch", and he suddenly turned over and knelt at the entrance to the alchemy room, digging up desperately with his hands. Mr. Pastor seemed convinced that since the head and deputy head of the group had gone down through this entrance, there must be a way here. He dug heavily, his hands covered in dirt and scars. Governed by the instinct of escape, the tender priest could no longer care about elegance and neatness, and even had no sense of torn nails.

Handfuls of blood-soaked black dirt were dug out, and there was still dirt underneath the dirt, and Fee's terrible situation could not change in the slightest. The sound of neat and heavy footsteps had reached the door, and the next moment those terrifying "killing machines" were about to burst into the house.

"Catherine, quick, quick! we have to do something. Ass shouted hoarsely, and he jumped up and lunged forward, as if intending to rush into the town of Mosi. But Ace fell heavily to the ground, and Ferry was clearly in front of him, but he just couldn't touch it. Ace unwillingly pounded his fist on the ground, letting out a low whine in his throat.

"There must be some way, there must be some way. Catherine muttered to herself, looking at the goblin scholar still standing in front of her, and then at Lady Vicie in the distance, "They don't bring up the theory of space mirrors for no reason. ”

"Mirror, mirror. Catherine repeated the word twice, and a flash of inspiration flashed through her mind, "We can see Ferry but Ferry can't see us, it's just a spatial node." Catherine exclaimed, pointing to the scene in Moss Town.

She looked angrily at Gray Cloud, "You damn liar, you don't even know where the spatial nodes are. ”

"No, Captain Catherine, Mr. Grey Cloud is not wrong. "We don't know where the random regression points are in the gray field, and we don't know how to trigger them in the field. Of course, we can also create a spatial node in the Paradise of the Brave that leads to the gray realm, such as this one in front of us. But this node is not complete, and it can only be used to watch battles in the realm. It will not bring you back into the grey realm. ”

"Founders, you have plagiarized my research. The goblin scholar standing in front of Catherine sighed resentfully, a sense of powerlessness in his voice. The old professor took a step forward, passed Catherine and vanished. Then, the goblin scholar actually stepped out of the wooden wall beside Fee.

Poor Ferry was still digging intently, and he had dug a pit twenty or thirty centimeters deep, completely oblivious to the goblin scholars. The old professor just stood there, silently watching the priest who was doing useless efforts.

"Bang" someone slammed into the wooden door, and the sharp blade of a half-round axe came out of the door. "Bang" followed by a second blow, with the thickness of this wooden door, I am afraid that it will not take three or five heavy blows to split it.

"Lady Vicie, I know you should have a way to rescue my companion. "Time was pressing, and Catherine spoke quickly and urgently," I remember you said that you were only doing things within the rules. And that lady Frost clearly broke the rules to put our companions in danger. Shouldn't you make amends?"

"You are sophistry, dear Captain Catherine. Lady Vicie only shook her head faintly in the face of Catherine's questioning, "I beg your pardon for taking the liberty of breaking the rules, but you don't have the strength to break through the second level. If it weren't for triggering the regression mechanic, I don't think it would have been a good time for not only Mr. Feeley, but also you and Mr. Ace to get to the town. In fact, Fei Shuang helped you, but because Fei Shuang's behavior was a rule break, we also agreed that you passed the second level. Isn't that fair?"

Catherine could not argue for a moment that strength is a prerequisite for all diplomatic negotiations. If the two of them stay in Mosi Town and fight the hoplites of the Bluestone Legion, then the result must be ten deaths. On the limited battlefield, even if the Kurid mercenary group is fully assembled, it is impossible to go head-to-head with the formed hoplites. Taking a step back, even if they can break through the hoplites, there are still formidable longbows waiting for them at the entrance of the town.

So, as Lady Vicie had said, it was a stroke of luck that Catherine and Ace were able to get out of Moth alive. Just give up Ferry like this, but Catherine can't make such a decision anyway.

"However, I had no idea that you would be followed by the ghost of the famous Twelve Toes Professor. "What a shocking fact, the goblin scholars, who should have retired from the stage of history, continue to influence the course of history under the protection of the kings of the Dead Realms. This valuable piece of information alone has earned you a fair deal. ”

The wooden door behind Ferry had been split open, and the terrifying figure of the hoplite appeared in the huge crack in the door.

"Well, I'm willing to make any deal as long as I can rescue Ferry. Please hurry up and save him. Catherine immediately agreed, urging her.

"Captain Catherine, please be patient. Since it is a fair deal, it is my responsibility to tell you what the deal is going to be made before you make a decision. Lady Vicie said in an unhurried tone, "The two of you, plus Mr. Feeley, have cleared the second level by leaving the battlefield, so your rewards for passing the level will be canceled." ”

"No problem. Ace jumped up and said to Catherine, "Alright, save people." ”

"Don't worry, Mr. As, I'm not done yet. "Lady Vicie is really capable of killing people," and that's just a verdict on your performance in the second level. If you want to save Mr. Feeley, you have to do something. I've just got you in mind a good price tag. We want to know why His Majesty sent an army against Mosi Town, and his relationship with Busso. Although a few years have passed since this incident, it is still an extremely valuable secret. ”

Catherine and Ace were stunned at the same time, but Catherine immediately reacted, "I promise, quickly!"

Ferry was still tirelessly digging through the dirt, the wooden door was smashed to pieces with a "clatter", and two hoplites crashed into the house with a breath of death. They walked up to Ferry from left to right, and at the same time raised their axes high and slashed downward.

Ferry stopped digging, and he looked up blankly, his eyes full of despair and even dead gray. The priest's lips were bloodless and trembling slightly, but he tried to pull a smile from the corners of his mouth as he looked at the blade that was about to return him to the embrace of the High God.

Suddenly, a pair of white and slender hands appeared behind Ferry out of thin air, those hands gently pinched Ferry by the collar and pulled it back, and the two axes slashed to the ground against Ferry with a shocking whistling sound.