The Magical Principles of Natural Philosophy at Hogwarts

"We successfully persuaded the shopkeepers to lower their prices because we bought enough at one time. After we got it back and sold it at a higher price of a few Knuts, it was quite profitable," Fred said.

"We have contacted Hufflepuff, and they are willing to spend some money to buy some gadgets. We will soon be able to expand our business there," George said.

"The next step is Ravenclaw," Fred added.

Slytherin was not considered because of the hostile relationship between the two parties. Of course Snape would be happy to accept reports to eliminate such a small trade organization that was not in compliance with school regulations.

"But having said that, although there is profit, the merchants in Hogsmeade must have taken most of the profits. We are also trying to make joke products ourselves. To be honest, the cost of raw materials is only three-thirds of the selling price at most.

one."

"So our research must not be put down." The two brothers reached a consensus.

Erwin nodded, it was quite good to have such knowledge at this age.

To sum it up, don’t let middlemen make the difference.

"Oh, by the way, Erwin, how do you feel about using the Marauder's Map? Is it easy to use? Does it feel like you control the entire school?" Fred winked at Erwin.

"I do feel that way." Erwin said vaguely.

In fact, he hasn't had time to explore the exact mechanism of the Marauder's Map yet, so he just made a rough guess.

The next day, Hermione had not been nice to Erwin since the morning, which made Erwin very confused. He never imagined that it was the result of a casual remark yesterday.

But he was too lazy to guess what the girl was thinking. Everything should be business as usual in a few days.

After breakfast in the auditorium, Harry and the others were going to the Charms class, while Erwin was going to the Chamber of Secrets. He no longer had classes according to the normal teaching schedule of Hogwarts and only needed to take exams.

This is a privilege given by Principal Dumbledore, and even Snape can't say anything.

Arriving at the secret room, Erwin took out the Marauder's Map.

Before, he had only watched the Weasley brothers operate, or asked them directly if Dumbledore was in school, and he had never actually used the Marauder's Map.

"I solemnly swear that I have no evil intentions."

It is not easy to show a full map of Hogwarts Castle on a piece of normal-sized parchment. It also shows the names of hundreds of people in the school, all in tiny fonts that are almost difficult to read with the naked eye.

However, you can use the wand to zoom in on the map itself. The Marauder's Map has this function.

When only a part of the area is displayed, the corresponding name will naturally be clearly visible.

At the same time, there is another function, which is to directly search for names. As long as they are on the Marauder's Map, they will be directly found and displayed. It is a very convenient function.

Overall, the human-computer interaction is pretty good, and the creator of this map is pretty knowledgeable.

Enter a few names at random, Harry Potter, in the Charms classroom; Draco Malfoy, in the Herbology classroom; Severus Snape, in the Potions classroom, teaching fourth-year students

;Percy Weasley, in the fourth spare classroom, must be studying in self-study, there is a girl next to him? His name is Penelope Crevat.

A boy and a girl live together in the same room, with no one else around. You can guess the relationship with your toes.

Putting aside the affairs of Percy's classmate for the time being, Erwin discovered a problem. There was no secret room marked on the Marauder's Map.

Doesn't it show?

Erwin thought about it and directly searched for his name.

Then he watched the Marauder's Map suddenly undergo an astonishing change. Countless lines collapsed and reorganized, and then formed a grid-like map. In the upper right corner of the map, there was a blank space indicating a room, and there was a name inside.

Irvine Frost.

Erwin was stunned for a moment, and then immediately realized that the Marauder's Map now showed... the underground of Hogwarts.

The secrets under this castle are far more than just a secret room.

What is shown on the map looks like a magic circle, which is composed of many underground rooms and facilities.

He had always suspected that the Marauder's Map was just a different kind of display screen, but now it seemed that the host was about to be found.

Erwin thought for a moment, and then unlocked the diary.

Riddle's illusory body emerged and gradually became solid.

"Look at this," Erwin said.

Riddle stepped forward and after reading it, he was also silent.

"What are your thoughts?" Erwin asked.

"Sure enough, it's not beyond my expectation." Riddle said softly.

"Then what did you expect?" Erwin asked.

Riddle did not answer immediately, but asked Erwin, "Aren't you surprised? If the basilisk was left by Salazar Slytherin, it might have lived for thousands of years."

"I remember that the basilisk is a creature created by a wizard and can survive entirely on magic power."

"Yes, they are not naturally growing creatures. So the question is, where does such a huge magic power come from that can allow the basilisk to survive for thousands of years?"

It was a good question, so Erwin remained silent.

"Magic power is not generated out of thin air. There are many peculiarities in this castle itself. It has many functions that can rotate on its own. Where does the magic power to maintain these functions come from?"

"You have also lived in this castle for six years and opened the secret room. Didn't you find anything?" Erwin asked.

"My discovery?" Riddle smiled, "My discovery is that with my ability, it is impossible to make any discoveries."

"Is that so?" Erwin was also a little surprised.

"Because you can't even go to other underground rooms, there are no passages, and the walls and floor of this secret room are unimaginably strong, and there is no possibility of destruction at all."

Erwin immediately tried it and cast a crushing spell on the ground. This was a standard spell for destroying objects. The floor tiles were indeed broken, but the soil under the floor tiles was intact.

Erwin recalled the battle with the basilisk. With Quasimodo's great strength, he could only break the floor tiles.

He suddenly understood that it was not the material of the ground that blocked the attack, but the magic power of the entire Hogwarts underground magic circle.

"I know that until I graduate and leave this castle, I will not have the ability to uncover the secrets of Hogwarts." Riddle continued: "So I made up my mind that when I am strong enough, I will definitely

Return here and completely uncover its secrets."

However, the final result was known to the entire British wizarding community. Until the Dark Lord suffered an unexpected failure, he never set foot in Hogwarts again.