All the Ravenclaw students laughed.

One of the girls said without hesitation: "Extraordinary wisdom is the greatest wealth of mankind."

They quickly arranged them in the correct order. In a dazzling light, the magic words on it disappeared, and instead, a string of gorgeous and elegant English words shone on the wall: "wit beyond measure an's greatest treasure."

"That's right! That's right, this wall obviously represents Ravenclaw, and the other three walls..." Percy said excitedly.

"Represent the other three colleges!"

Everyone thought of this.

Under the guidance of this thinking, the magic words on the other three walls were also cracked one after another.

"Courage and fearlessness are my best friends." This is the famous saying of Godric Gryffindor.

"Tenacious and honest, upright and loyal." This is people's evaluation of Hufflepuff.

"Be with honor and be with the powerful." This is a famous saying of a famous Slytherin wizard in history.

On the four walls, four lines of text shone brightly, and everyone subconsciously held their breath. Sure enough, the writing on the wall disappeared.

In the darkness, only the light from their wands served as a light source, and these not-so-bright lights illuminated their excited faces.

An ordinary door appeared, as if it had always been there, and the students walked in.

There was only a table inside, and on the table was a manuscript titled: "An Important Manuscript".

Geoffrey turned to the first page, which read: "Collect four keys and you can get out of here." Other than that, it was blank.

He snorted, "Do we still need keys? Just push the door open and we can get out..." He suddenly stopped talking, as if he was choked by saliva. A layer of sweat quickly broke out on his face, "Can we, can we still find the door of the classroom?"

As they looked at each other, Percy said to the air: "Professor Hep... Are you there, Professor Hep?"

There was no response.

"It seems that we must collect the keys." Wood scratched his head, "But where are they?"

"Of course, the four directions of east, south, west, and north. Remember the magic runes we saw on the tombstones?" Percy said to Penelope.

"You mean... that story!"

"Yes." Percy said loudly, his nose slightly reddened with excitement, "The text on the tombstone records the information of this place, but there is actually another thing, which is one of the keys."

So, the Gryffindor and Ravenclaw students took out the parchments they had recorded before and arranged them as needed.

"I have 3-1 here, who has 3-2?"

"I'm in front of you, I'm 1-7."

They pasted the parchments on the wall in order and looked at them carefully: "Obviously, there are ten in a group, a total of four groups."

"The first group introduces the background of the action in 1842, which is similar to what Professor Hepp said..."

"It doesn't matter." Geoffrey said.

Percy rolled his eyes and continued, "The second group introduced the topography of this place. It's very simple, east, south, west, north, and the safe house in the center."

"The third and fourth groups are the troubles encountered by the Ministry of Magic staff at that time. Oh, although the concealment magic has failed, other protective measures are still working. Look here, one of the defenses is a large number of Inferi, which are the little skeletons we met..." "

That's really evil! Why didn't the Ministry of Magic catch him at that time?"

"Oh, I think it might be because they didn't have time to establish the Ministry of Magic..."

...

"What are the other defensive measures?"

"Vodibats, magic statues and devil vines." Percy pointed to the text above and said.

"Very good~ It seems that we have to deal with similar things," Wood said: "The Inferi correspond to the little skeletons, and it seems that there are similar substitutes in other places, but what I want to ask is, what is a Voldibat?" "It is a

very rare magical creature, which looks like a black cloak, gliding close to the ground, and hunting at night. Some people say that they are close relatives of Dementors. In addition to their similar appearance, they are also restrained by the Patronus Charm." Percy said.

"Is there anyone here who can cast the Patronus Charm?" Wood asked.

No one raised their hands.

Percy told part of the truth: "That's not part of the exam, Wood. No one would go to the trouble of spending a lot of time learning a powerful spell that they won't use."

Penelope recalled: "Dean Flitwick mentioned this spell in class. I tried it a few times, but there was only some white mist. If someone guides..."

"But the Voldemort is a very dangerous creature. The professor won't let us deal with it. I guess we will encounter a crow's nest then?" Percy speculated, but he believed that he was right.

"No more small talk, where should we start?" Jeffrey said.

"The tombstone group, we are most familiar with that place, which can save time."

"Very good."

They walked out of the safe house, Percy held the wand flat on his palm and whispered to it: "Show me the way."

The wand rotated and pointed to his right hand, which was north.

"So we have to go in the opposite direction and we will return to the tombstone group." Percy said to everyone.

They returned to the tombstone group again, and the Slytherin and Hufflepuff students pointed at the black stone tombstones and marveled.

"Look, the skeleton bones have all turned into stones." Wood reminded.

Gryffindor and Ravenclaw students found that the small skeletons that were originally scattered on the ground had all turned into broken stones.

"It's a very clever transfiguration. We didn't see it at all at the time." A wizard picked up a stone and looked at it carefully.

A Ravenclaw girl said sadly: "I held it before. It looked very cute."

Percy looked at her with a strange face. He pulled Penelope and whispered: "Is she always like this?"

"She is an avid fan of magic puppets." Penelope explained.

"Okay, everyone, look separately, it shouldn't be too difficult..."

After seven or eight minutes, a Hufflepuff student found a golden key in a stone.

"Where did you find it?"

Grover pointed to the broken stones not far away. Wood's eyes widened. "That was the little skeleton that attacked me. I kept it on purpose! I didn't expect the key to be hidden in its head."

"Very good, we have completed a quarter of the progress. Let's keep working hard next..." Percy was about to encourage him when Slytherin prefect Geoffrey came over with a box.

"What is this?"

"A treasure map." Geoffrey said.

"How can there be such a thing?" Percy's mind was in a mess. The students gathered together and looked at the map in the box.

The mark on it was very simple. In the southeast direction of the safe house, there was a bottle pattern, and next to it was a magic symbol representing wealth.

At this moment, a muffled thunder-like voice came from the sky.

"It seems that you had a lot of fun... But I have to regretfully inform you that this unexpected journey is temporarily over. Take your things and follow the instructions to walk out of here."

An arrow appeared under their feet.

Ten minutes later, they returned to the ancient magic classroom again, with expressions still blank and trance on their faces.

"Is it over? Haven't we collected all the keys yet?"

Felix smiled at them on the podium: "Class will be over in a few minutes. In order to prevent you from being late, I have to interrupt this adventure. But don't worry."

"You will be there for the rest of the school year. In addition to the task of collecting four keys, you will encounter many strange, simple and interesting small tasks..."

"Such as the treasure map?" "

That's right, Jeffrey." Felix said: "The homework for this class is to parse the magic runes you encounter and complete a paper that is no less than one foot long."