Save the world from Hogwarts

They were not in an empty classroom as he thought.They are in a corridor.It was the corridor on the fourth floor that Principal Dumbledore had emphasized to be off-limits when school started.Now he knew why it was off limits.

They were facing a huge, monster-like dog.The dog was so big that it filled all the space from ceiling to floor.There were three heads on its neck. Three pairs of ferocious eyes on the heads stared at them motionlessly. Three huge noses were trembling towards them. Three mouths drooling with sticky saliva were wide open. The sharp yellowed teeth shone horribly in the weak candlelight coming from under the door.

Lin Zhen felt that the reason why it hadn't pounced yet was because their sudden appearance surprised the big dog.But it was quickly coming to its senses, and what those deafening roars meant could not be clearer.

Draco fumbled with the door handle and backed away step by step.He no longer cared about the consequences of being caught by Filch. Between Filch and death, he chose Filch without hesitation.

"Ah" Hermione let out a scream that could pierce her eardrums. Together with Draco, she grabbed Lin Zhen and the stunned Ron tremblingly, opened the door and rushed out.

"How dare they" Draco gasped, "I'm going to tell my dad"

They were panting outside the Gryffindor common room, their robes hanging askew.The Fat Lady looked worriedly at their red faces dripping with sweat in the portrait.The Fat Madam noticed that only Lin Zhen looked normal, not panting or sweating, her face was healthy, only her robe was a little crooked.

"You guys should go back and rest first," Lin Zhen said to Ron and Hermione who were lying on the ground. "We will discuss this matter later."

Hermione nodded, shivering and dragging Ron into the common room.

Lin Zhen led Draco, who was still angry, to the Slytherin lounge in the cellar.

"Dumbledore actually agreed to put such a dangerous creature in Hogwarts," Draco trembled and growled, "We would have been dead if we hadn't run fast while we were still in the castle."

"Did you notice what it was standing on?" Lin Zhen asked softly.

"On the floor," Draco guessed distractedly, "I was just looking at its head."

"A trap door." Lin Zhen said, "Obviously, he is guarding something."

Draco calmed down: "What could it be that Dumbledore would risk the death of students and let this big dog guard it?"

"Do you still remember that report from Gringotts before school started?" Lin Zhen asked.

"The one about the break-in at Gringotts." Draco looked at him. "The thing that the thief wanted to steal is now under the feet of the big dog at Hogwarts."

"Smart" Lin Zhen nodded, "Hagrid took me with him that day and took the package from the vault first. Hagrid said he was entrusted by Dumbledore."

"It seems so." Draco pondered.

"Don't tell your father about this first." Lin Zhen ordered.

Draco nodded.They parted in front of the Slytherin common room.

Lin Zhen returned to the dormitory and smiled softly while lying on the bed.

Headmaster Dumbledore, what do you want from me?

The foursome meet by the Black Lake.

Ron took some food from the kitchen, and while they ate, they listened to Draco talk about Lin Zhen's discovery.

They all speculated about what was in the package.

"This thing is either very valuable or very dangerous." Ron said after swallowing a mouthful of bread.

"Or both," Hermione said.

All they knew for sure about the mysterious object was that it was two inches long.They couldn't guess what it was until they had more clues.

Hermione persuaded them to leave the damn thing alone, thinking Dumbledore would handle it just fine.Moreover, she no longer wanted to go near the corridor on the fourth floor.

"What a shame," Ron whispered, "I'd love to go again."

Hermione glared at him fiercely.Ron surrendered.Draco and Lin Zhen laughed.

The days that followed were uneventful. They studied hard and went to the kitchen every Tuesday and Thursday night to taste the new dishes made by the house elves based on Lin Zhen's recipes.The menu at Malfoy Manor grew longer and longer, the parchments on which Hermione recorded recipes grew, and Ron's face became visibly rounder.

Sometimes they would meet Ron's twin brother in the kitchen.They are very interesting and Lin Zhen gets along well with them.They were full of praise for the new dishes made by the house elves. After learning that the recipes came from Lin Zhen, they told Lin Zhen more about the secret passages of Hogwarts that they knew.

"Who is their brother?" Ron said dissatisfied.

"Haha, are you jealous?" Draco laughed.His words earned Ron a slap in the face.

They would go to the library together on Saturdays to complete their homework, listening to Hermione complain that Ron always used her papers as "references" and never completed them himself.

They would also spend Sundays exploring the castle's secret passages and running past curfew to evade Filch.They never set foot in that corridor on the fourth floor again.

When Lin Zhen stayed after her fifth Potions class and looked at Professor Snape through his glasses with wet green eyes asking for advice, Snape finally couldn't bear it anymore and asked him to come to his office for tutoring every Wednesday night at six o'clock. Potion.

Lin Zhen secretly smiled in her heart, looking at Professor Snape who lowered his head to sort the glass jars because of his bright eyes, and said happily: "Professor, thank you for being so kind to me. See you tomorrow night."

Snape looked up in disbelief. Lin Zhen had already left with her schoolbag.

In the evening, the foursome gathered in the kitchen.Lin Zhen told them about how he went to Snape's office every Wednesday night to study.

"You're so awesome," Ron sighed in an exaggerated tone. "This is the first time I've heard of someone approaching Professor Snape without fear of his venom. Your courage is commendable. Maybe you should come. Gryffindor."

"That would make it more difficult for Harry to get close to Professor Snape," Draco pointed out. "Professor Snape hates Gryffindors the most."

"So as long as there is a Potions class, Gryffindor's gems will fall like crazy." Ron put his chin on the table, looking weak.

"If we don't make any mistakes, Professor Snape won't have a chance to deduct points from us," Hermione said.

"That's impossible." Ron lamented, "Potions are too difficult."

Fortunately, Clay served tonight's new dishes at this time, and the children had no chance to open their mouths to speak. They were busy destroying these delicacies.

In the morning, Lin Zhen came back from exercise and stood in front of the bathroom mirror to observe her body.

The boy's skinny body became rounder.Compared with the malnourished appearance when I first started school, although my body is still a little thin now, it is obviously much healthier.The outline of muscles began to appear on his body. He nodded with satisfaction and began to take a shower.

Professor McGonagall's Transfiguration class is still so interesting.Lin Zhen controlled the degree of transformation in her practice works so that she could reach the level of most Ravenclaw students, rather than a perfect transformation.Top students will make the teacher pay more attention to you, and Lin Zhen doesn't want to be paid attention to.

At six o'clock in the evening, Lin Zhen knocked on the door of Professor Snape's office on time.The Potions Master's office is located in the cellar, with a woman carved on the door.Her hair is made of thousands of tiny snakes, and her waist is covered with snake tails.

Lin Zhen looked at the statue.The snake on the woman's head danced wildly, with scarlet nodules poking out from time to time.The woman twisted her snake tail and climbed to the same height as Lin Zhen, looking at Lin Zhen with interest.

"A smart and elegant little nobleman," the woman commented.

"Thank you for your compliment, madam." Lin Zhen said with a smile.

The woman seemed surprised: "You talked to me"

"It's obvious." Lin Zhen said, "Can't others do it?"

"Yes, after all, snake murmuring is very rare." The woman replied, "You are a Slytherin."

"No, I'm Ravenclaw."

"My name is Medusa," the woman said. "You can come here often to chat with me. It's been a long time since I've had anyone to talk to."

Lin Zhen smiled: "I am very happy, beautiful Ms. Medusa."

Medusa twisted her tail happily and opened the office door.

Lin Zhen walked in.The office looked as cold as the Potions classroom.In the corner of the office is a large operating table with a crucible on it, which is empty.Next to the operating table is a wooden cabinet filled with various glass jars filled with potions of various colors.

There is a small door on the wall next to the cabinet, and the door is closed.His Potions Master was sitting at the table next to the small door. There were piles of parchment on the table. The Potions Master took a quill and drew two heavy strokes on a piece of parchment, the force penetrating through the back of the paper. Lin Zhen recognized that it was a "t".

"Is the great savior waiting for his humble Potions Master to step aside so that he can sit down?" Snape looked away from Lin Zhen, took a piece of parchment from the tall parchment, and read it.

Lin Zhen walked over, pulled out the chair next to the table, and sat across from Snape.

"Good evening, Professor Snape."

"Your Potions Master doesn't have that much time to say hello to you," Snape quickly wrote a few comments on the parchment, and then wrote a "p" hard, "What problem is worthy of the savior? His Potions Master sacrificed his time to answer it, and I hope you don't ask questions that even a troll can answer, or I'll boil you into a potion."

Lin Zhen expressed his doubts in a soft voice.Snape wrote "p" viciously on several pieces of parchment.

"It seems that our savior thought," Snape said without raising his head, "that a first-year freshman could make the potion perfectly the first time he made it. This is something only a potion genius can do. Are you"