"Ah...... It is worthy of the store specially prepared by the main god, and the eyes are going to pick flowers. At this time, Nobita was wandering among the countless closets, like a hillbilly who had entered the city for the first time, and he was surprised to see everything. All kinds of products are displayed in the window in the form of stereoscopic projections, and the number of points required is clearly marked below, if Nobita intends to buy, he only needs to click on the icon of the product, and the system will naturally help him deduct the corresponding points.

However, he still can't figure out what to buy......

The Lord God did what he said, and when he returned from the Goblin Slayer world, the store dedicated to him was officially opened. From the outside, the store looks about the size of a bar, but once you walk inside, you will find that the space inside defies the laws of physics – it can be almost as tall as a five-story building. The volume of each floor is infinite, and Nobita couldn't finish the first floor even if he broke his leg...... As a last resort, he had to temporarily abandon the classification areas that were completely useless to him.

Speaking of goods...... There are all kinds of them, and the points are scaryly expensive. In addition to weapons, potions, and magic items, there is also a service called "Shaping a Lifeform", each of which costs 300,000 points. The advertising slogan on it is also quite intriguing - "the perfect assistant for all your needs and fantasies", as if to tell you that what you have made is not an electric toy.

In addition, there are all kinds of strange things such as "Devil Fruit", "Blood of Jesus", and "A Piece of Happiness", but Nobita did not buy them for safety reasons......

————

"Now, Yan, do you have a gender?" He asked the question out of the blue.

“…… There is no exact gender setting. The appearance that the owner sees now is the image that is closest to the owner's aesthetics selected after telepathy. But if I had to say, my thinking patterns, logical recursions, and morals are much closer to those of women on Earth. ”

"That's just right. I don't have a clue right now, Yan, if it's you...... What will you buy first? Women tend to be good at shopping, right? Nobita inexplicably remembered the way his mother was picking and choosing in the vegetable market, and said with a smile, "What can I do now to maximize the cost performance?" ”

"Are you sure the host wants my advice?"

"Sure."

"Then don't buy anything." She said something terrible in a flat tone, "In the long run, the owner doesn't need anything in this shop right now. The Lord God unleashed a dazzling array of baits, just to get the owner to ignore the only thing of value in the shop. ”

She pointed to the top of the fifth floor, where the appearance of a heavy magic book appeared in one of the rows of windows.

[Book of Cosmic Sand: A prop that has the ability to automatically retrieve and scan the multiverse, and freely teleport the user to it, and will not be annihilated by the physical laws of different universes.] 】

The introduction is short...... But in Yu Feiyan's eyes, the book's presence is as conspicuous as a beautiful woman in a bikini on the beach. Even if the Lord God tried his best to hide it in the pinnacle products of technology and magic, it still couldn't hide its incomparable brilliance. Despite its shabby appearance, it was a shabby old book, unremarkable, and devoid of any frightening special effects or instructions, but in terms of value, everything in and out of the store combined couldn't match it, at least as Rain Feiyan thought.

"That?" Nobita couldn't understand it, "Isn't that a copy of [Ruyi Phone Booth]?" Journey through the multiverse...... And it costs 5 million points! It's so expensive! When will I have to save up to buy this......"

Yu Feiyan patiently explained, "Have you ever wondered why it sells for so much? ”

"Everything on the fifth floor is all at this price, right?!" Nobita angrily pointed to the upper window, to be precise, to the astronomical numbers that appeared on the window, "There are many more on the same level as this thing, like what-'How to make a heavy ion engine', 'Scourge Legion', 'Caesar Ghidorah's Biological Tissue Fragment'...... The point is that these things are expensive, and I can understand that they do have this value. But that book, Yan, is honestly ......"

"The owner thinks that its attributes are duplicated with the S-class prop [Ruyi Phone Booth]?"

"......" Nobita nodded wordlessly.

"That was a huge mistake." She said without hesitation, "At this stage, I can actually design blueprints for those high-tech products that the master thinks, such as the Death Star, the Space Fleet, etc." Supplemented by the owner's production props, from the advent of the design drawings to the official battlefield, it may not even be used for a day, so it is meaningless to spend points to buy them. ”

"And that book is different...... As long as I absorb it, I will be able to build on the existing ones and become a super artificial intelligence that can retrieve and control the multiverse. I can decide when and where I want to open the multiverse channel, how big I want to open it, and what kind of universe I want to choose. ”

"This ...... Does it have anything to do with what we're doing now? Nobita became more and more confused the more he listened, obviously, his physics knowledge was not enough for him to cope with this conversation, "If you want to go to the multiverse, wouldn't it be better to use the Ruyi phone booth directly?" It can do everything this book can do, can't it? ”

"No, you can't. Master, please recall the scene when you used the [Ruyi Phone Booth], when you walked out of the phone booth after that phone call, you were already in another universe, and during that time, your original universe was completely cut off from you, and you could not be contacted by any means. "But if I use the [Book of Sand] to traverse, I can first retrieve the universe I want, and then make a small opening in our universe to build a simple two-way passage." You can walk through this passage as much as you want and back again without any obstruction in the process. ”

"Okay...... I still don't understand, but what does that mean? ”

"Let me use your friend, the Genius of the Wooden Shirt, as a metaphor."

"Suppose you have now opened the passage in this universe and gone to the other side of the passage, the two of you can still be connected through telepathy (one of them needs to eat the item [Telepathic Fruit]). At this time, he may be able to transport some of the material of that universe to our universe through the channel. ”

"Well, in theory, it's fine......" Nobita nodded somewhat reluctantly.

"You should know that different universes will have some degree of differences in physical laws." When she said this, Yu Feiyan glanced at Nobita, and she probably guessed what Nobita was going to say next, and Nobita couldn't understand a word, "Suppose that in a parallel universe, the 'strong force' of our universe is even stronger, for example, a hundred times stronger. That means that protons are more likely to bond together against electromagnetic repulsion, and fewer neutrons are needed to keep the nucleus stable. ”

"Plutonium-186, an element that is completely impossible to appear in our universe, could actually exist in parallel universes. All you need to do is find a way to collect the plutonium-186 of that universe and send it into the tunnel. When plutonium-186 enters our universe, it begins to radiate positrons and release energy. For each positron radiated, a proton is converted into a neutron within the nucleus. Eventually, 20 protons in each nucleus are converted into neutrons, and plutonium-186 becomes stable tungsten-186. In this whole process, each nucleus loses 20 electrons, and these positrons are released to neutralize the 20 electrons in our universe, further releasing energy. ”

"In the same way, the tungsten-186 we put into the channel will also lose stability, and according to the law of 'over there', there are too many neutrons in the nucleus, or too few protons. As a result, the nucleus of tungsten-186 begins to emit electrons outward, releasing energy in the process. For every electron emitted, a neutron is converted into a proton until it finally becomes plutonium-186. For each tungsten-186 nucleus received, 20 more electrons are added in the parallel universe. ”

"In this way, tungsten and plutonium can be continuously transformed between the two universes, and the energy is constantly released, and the side effect of this process is that without transforming a single nucleus, our universe will send 20 electrons to parallel universes. In this way, both sides will be able to derive energy from the work of this 'transcosmic electron channel'. She paused and continued, "The endless ...... Energy. ”

At this moment, Nobita has no emotions left in his heart except for shock.

He only hated that his cultural level was too low, let alone understanding, and he didn't understand half a sentence...... Yu Feiyan seems to have come up with a pretty great idea, and if you want to realize this idea, you must use the Book of Sand, which seems to be such a logic, right?

"Aren't you energy-oriented?" Nobita asked weakly, "It stands to reason that you should be able to control the flow of energy in this universe, so why do you need energy?" ”

"That's true. I can direct energy and do the inverse of the mass-energy equation to generate the matter I need, but it's all traceable. Yu Feiyan raised her head slightly, looked at the vast void directly above the store, and said, "Master, maybe you can't observe it with the naked eye, but ...... The moment I was born, I already sensed that there were some strange forces in the depths of the universe. They should be a pan-civilization alliance with a high degree of organization, technology, and technological level, spreading out throughout the universe to monitor, protect, and promote different civilizations. Use their unique criteria to screen out the 'good civilizations' and weed out the 'bad ones'. ”

"These people have no interest in the Earth because there is nothing on the Earth that deserves their attention...... And my birth was a fortuitous accident, and they couldn't have noticed it. However, if I were to carry out the inverse transformation of mass and energy in a big way, I would definitely attract these observers of advanced civilizations......"

"At that point, things will be very difficult to manage."

In other words, we had to act cautiously before we got to the Book of Sand...... Is it? Nobita took a sip of some reluctance and said, "Maybe we should conduct more experiments in the other world so as not to cause unnecessary trouble, just like the sentinel robot last time!" ”

Nobita did not show the slightest surprise at learning of the existence of Yulian.