Under the refraction of the water and the illumination of some kind of fluorescent plant at the bottom of the lake, the whole mermaid village was illuminated by a kind of green light.
"Fluorescent Twinkle!" Elwyn waved his wand and it glowed even brighter.
The mermaids looked at him and the glowing wand curiously, but they did not surround him. They were still singing and dancing.
Elwyn walked closer and found that the crack was at the center of the mermaid statue's tail and waist.
It was covered with thick water plants and moss, and it was faintly discernible under the light of the wand.
Elwyn examined the crack carefully. It turned out that it was formed after a piece of the statue's scale disappeared.
He put his wand deep into the crack, and so did his head.
Inside the crack was a narrow stone passage, the size of which could only allow one person to crawl through.
The passage followed the direction of the terrain and continued directly below the mermaid statue. It was a naturally formed crack.
There were no signs of any artificial construction inside. The rock walls on both sides looked very rough, winding, and rugged.
There seemed to be something inside, but because of the angle, it could not be seen clearly from the outside.
Elwyn spat out a few bubbles, held his wand horizontally in front of his chest, and went forward into the crack. He swam down diagonally.
With the light of the wand, he closely observed the gray rocks on both sides. The texture was not as hard as he had imagined.
These rocks were easily damaged by external forces, and the natural crack inside was very narrow.
This meant that without the right magic to open it, it was almost impossible to rely on brute force to enter from the outside.
If the damage was slightly weaker, it would not be able to open the outermost stone door of the statue.
If the damage was slightly stronger, the crack on the ground would completely collapse, annihilating the narrow passage.
The scale was very difficult to grasp. The designer must have carefully measured it to build the mermaid statue on it.
In the crack, Elwyn swam down diagonally for more than ten feet, and suddenly landed on the ground.
The passage formed by the crack disappeared, and the space in front of him suddenly became open and spacious.
The cold water and water pressure around him quickly disappeared, and the air became dry again.
Elwyn turned around and stretched out his left hand to sense. In front of him was an invisible magic barrier, all the lake water was blocked outside.
The mermaids outside did not know how to use magic, so how did this magic barrier appear here?!
Although it was just an ordinary barrier, the magic barrier that suddenly appeared was very powerful.
It was definitely left behind by a powerful Magus. Could it be Royna Ravenclaw?!
In a place like this, there seemed to be no one else but her!
No wonder those mermaids refused to come in. They must have known that they would come out of the water soon.
Elwyn quickly evaporated the water droplets on his body and continued forward. He was getting more and more curious.
He had only taken two steps when he stopped. The mermaid's singing from above did not dissipate. Instead, it became clearer.
It sounded ethereal and beautiful, like the sounds of nature.
The song echoed in the tunnel, making everything in front of them seem unreal, like a dream or an illusion.
"This voice doesn't sound right …" Elwyn was stunned for a moment, his thoughts gradually lost in the mermaid's song.
The song that rang in their ears had a magical charm that made people unable to resist being immersed in it, not wanting to do anything else.
Amidst the beautiful music, Elwyn grew more and more tired and listless. All he wanted to do was lie down and sleep.
"Close your earplugs and listen!" He used this spell on himself, and his ears were instantly filled with an indiscernible buzzing sound.
It was like the noisy discussion of the whole school in the auditorium, or the whispers in the classroom.
The mermaid's song returned to normal, and the magical charm that suddenly emerged disappeared.
Elwyn continued forward, becoming more and more curious about the magic that was left here.
This magic relied on the mermaids who had no power to activate it. They fused with each other and influenced each other. The design was very ingenious.
With Elwyn's current level, there were still many parts that he could not understand, let alone touch on them.
Along the tunnel, he spun down and came to a stone door. The door did not have a handle or a keyhole, only a smooth brown wooden board with an eagle-shaped bronze knocker. At the top was a dark blue raven.
The raven's eyes were a very strange red, and it was staring straight at Elwyn.
Elwyn pointed his wand at the raven and blinked. Only then did he see that the raven's eyes were two rubies.
They shimmered under the light of the wand, and looked very uncomfortable.
He did not know what material this thing was made of, but it was very realistic.
In front of the door, Elwyn felt like he was being watched, but strangely, there was no magical reaction.
He lowered his head and moved his gaze from the raven to the main body of the door.
Looking at the familiar eagle-shaped knocker, Elwyn thought of the door of the common room in Ravenclaw Academy.
It was said that the current Ravenclaw Tower used to be the laboratory of Ravenclaw Academy.
That was why she left such a unique door there, to test the wisdom of the visitor and whether they were qualified to enter.
Unlike the other three academies, only the wizard who could give the correct answer could enter Ravenclaw Academy.
Even if it was Ravenclaw's students, if they could not solve the answer, they could only stay outside.
If it was any other academy, there would probably be many people sleeping in the corridors outside every day!
However, the students of Ravenclaw Academy were not tired of it, and thought that it was a good test.
Since there was such a door here, there was no doubt that it must have been left behind by Ravenclaw.
Perhaps, the key to her secret treasure was inside. Elwyn did not expect it to be so simple.
Next, he just had to solve the question posed by the door.
Other than the tempting mermaid singing, he did not encounter any obstacles along the way.
Elwyn did not let his guard down. Since Gryffindor left a test, there was no reason for Ravenclaw to do nothing.
He walked to the door with his wand in one hand and knocked lightly with the other.
In the silence, Elwyn felt that the sound was like a cannonball exploding.
The eagle's beak immediately opened, but there was no bird cry. Instead, it spoke in a cold and gloomy voice, "Strange visitor, you will be judged here, and death will be your only end."
As soon as it finished speaking, a powerful and strange magic instantly filled the space around Elwyn.
He instantly cast a protective spell that he had prepared, but it did not work.
The power that suddenly appeared in the space around him was too strong, and Elwyn found himself as if he had been hit by a petrifying spell, losing control of his body.
At this moment, the raven on the door suddenly flew up.
It chose above Elwyn's head, its blood-red eyes staring at him.
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