The Magical Principles of Natural Philosophy at Hogwarts

"We managed to persuade those shopkeepers to lower the price, because we bought enough at one time. After we got it back, we raised a few nats and sold it, which was quite profitable." Fred said.

"We contacted Hufflepuff, and they are willing to spend a little money to buy some gadgets. Soon we can expand our business there." George said.

"The next step is Ravenclaw," Fred added.

Slytherins were out of the question, because of the hostility between the two sides, and Snape would of course be happy to accept a tip-off to root out such a small, not-so-school-compliant trade organization.

"But having said that, although there are profits, 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 at most only a third of the selling price. one."

"So we must not let go of our research." The two brothers reached a consensus.

Erwin nodded, it is not bad to have such insight at this age.

To sum it up in one sentence, don't let middlemen make the difference.

"Oh, by the way, Erwin, how does it feel to use the Marauder's Map? Is it easy to use? It feels like I control the whole school by myself?" Fred winked at Erwin.

"It does feel that way." Erwin said vaguely.

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

The next day, Hermione didn't give Erwin a good look from the morning, which made Erwin very puzzled. 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 back to normal in a few days.

After breakfast in the auditorium, Harry and the others were going to the Charms class, and Erwin was going to the Chamber of Secrets. He had already stopped attending classes according to the normal teaching schedule at Hogwarts, and only needed to take the exam.

This was a privilege given by Headmaster Dumbledore, and even Snape couldn't say anything.

Reaching the Chamber of Secrets, Erwin took out the Marauder's Map.

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

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

It is not easy for a piece of normal-sized parchment to show the whole map of Hogwarts Castle, and it does show the names of hundreds of people in the school, all of which are so small that it is almost difficult to read with the naked eye.

However, it is possible to zoom in on the map itself with the wand, which is available on the Marauder's Map.

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

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

On the whole, the human-computer interaction is not bad, and the maker of this map is quite knowledgeable.

Enter a few names at random, Harry Potter, in Charms classroom; Drago Malfoy, in Herbalism classroom; Severus Snape, in Potions classroom, teaching fourth year students ;Percy Weasley, in spare classroom No. [-], should be studying by himself, but there is a girl next to him?The name is Penelope Clearwater.

A boy and a girl are in the same room, and there is no one else. It is really a relationship that can be guessed with your toes.

Leaving aside Percy's romance for the time being, Erwin discovered a problem, the secret room was not marked on the Marauder's Map.

Is it not displayed?

With a thought in mind, Erwin searched for his name directly.

Then he watched the marauder's map suddenly undergo amazing changes. Countless lines collapsed and reorganized, and then formed a grid-like map. Elvin Frost.

Erwin was stunned for a while, and then immediately realized that the Marauder's Map now shows...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, a magic circle 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 the host seemed to be found soon.

Erwin thought for a while, 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 do you think?" Erwin asked.

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

"Then what did you expect?" Erwin pressed.

Riddle didn't answer immediately, but instead asked Erwin, "Don't you find it strange? If the basilisk was left by Salazar Slytherin, it might have lived for thousands of years."

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

"Yeah, they are not naturally growing creatures, so here comes the question, where does such a huge magic power come from to allow the basilisk to survive for thousands of years?"

That's a good question, so Erwin is silent.

"Magic power doesn't just come out of thin air. This castle itself has many unique features. It has many functions of turning around on its own. Where does the magic power to maintain these functions come from?"

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

"My discovery?" Riddle smiled, "My discovery is based on my ability, it is impossible to make any discovery at all."

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

"Because you can't even go to other underground rooms, there is no passage, and the walls and ground of this secret room are unimaginably strong, and there is absolutely no possibility of damage."

Erwin tried it right away, and cast the Shattering Curse on the ground, which is a standard spell for destroying objects. The floor tiles were indeed broken, but the soil layer under the floor tiles was actually intact.

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

He suddenly understood that what blocked the attack was not the material of the ground, but the magic power of the Hogwarts underground magic circle as a whole.

"I know that I won't have the ability to uncover the secrets of Hogwarts until I graduate and leave this castle." Riddle continued: "So I made up my mind that when I have enough strength, I will definitely Return here and fully reveal its secrets."

However, the final result was known to the entire British wizarding world, and until the Dark Lord suffered that unexpected defeat, he was never able to step into Hogwarts again.