Because it was close to the Hogwarts, no Wizard would go to the nearby waters to collect magic materials. This was not allowed.
The mermaids themselves were not proficient in magic and potions, so they were even less likely to be interested in these things.
After a thousand years of accumulation, the number of all kinds of materials and herbs in the nearby waters had accumulated to a terrifying number.
Two months ago, when Elwyn gave the mermaids a gift for the first time, they were overjoyed and had planned to exchange the decorative graffiti, pebbles, shells, and all kinds of other things with Elwyn.
It was difficult to refuse their kindness, and Elwyn could only reluctantly accept the magic materials and herbs offered by a few mermaids.
The mermaids had been worried that they could not find suitable things to exchange with Elwyn.
Compared to human Wizards, their village was too barren no matter how one looked at it.
Seeing that Elwyn was willing to accept these things, they felt that they had finally found the right direction.
The mermaids began to collect these magic materials from all over the place and used them to trade with Elwyn.
Over time, the news spread more and more.
The number of mermaids who knew the news grew, and it evolved into the scene that it was today.
One had to know that although the mermaids looked abnormally scary, they were actually not evil dark creatures.
They were also not as arrogant as the centaurs, who did not communicate with humans and only lived in the small circle of their own clan.
On the contrary, the mermaids were very open-minded and friendly.
They maintained awe and yearned for magic, were willing to make friends with human Wizards, and were even more fond of human-made items.
Unfortunately, there were very few Wizards who knew the mermaid language and were willing to interact with them, and the Wizards who could communicate with them would not do what Elwyn did.
Apart from him, there were no Wizards who would exchange items with them for magic materials to satisfy these needs of the mermaids.
At this moment, a strange scene appeared at the bottom of the lake.
A large group of mermaids surrounded Elwyn, handing over precious magic materials as if they were free.
Because today was the mermaid tribe's sacrificial activity, the number of mermaids who swarmed in was much higher than usual.
They floated around Elwyn, their yellow eyes wide open, and their incomplete teeth were also yellow.
Every mermaid looked at Elwyn and tried to put on a scary smile that they thought was kind but actually looked malicious.
Among all the things that Elwyn had brought, the mirror was their favorite, and it was being fought over like crazy!
No matter what, this result was a little unexpected!
Elwyn was not sure whether these mermaids would be scared to tears after seeing his ugly face in the mirror.
After a few words of greeting, he irresponsibly threw the items on the ground for the merpeople to choose for themselves.
In any case, they were very trustworthy and would consciously leave the magic materials they used for the exchange at the same place, waiting for Elwyn to come and collect them.
Elwyn walked to the center of the square and found the strong mermaid who had fainted due to magic.
After a few encounters, he knew that the mermaid had a high status in the mermaid tribe, was a very powerful warrior, and was respected by the people.
Elwyn handed over the gifts that he had specially chosen for the mermaid, and the mermaid babbled a few words, probably expressing his gratitude to Elwyn and asking Elwyn to go to his house to get the corresponding magic materials after the sacrificial activity was over.
"What is this sacrificial activity that you are conducting?!" Elwyn asked directly, spitting out a bunch of bubbles.
"Just a traditional celebration," the mermaid said in a low, hoarse voice.
He also spat out a bunch of bubbles from his mouth. The mermaid spoke very quickly, and there were many parts that Elwyn still didn't quite understand.
But the general meaning was clear. This sacrificial activity was left behind by the mermaid ancestors, and it was conducted once a month.
What interested Elwyn was that the mermaid told him that there was a rumor that this sacrificial activity was originally an agreement between the mermaid ancestors and the castle builders.
Over time, the sacrificial activity evolved into a large scale gathering to remember the ancestors.
In other words, this matter was very likely related to the treasure key left behind by Ravenclaw.
Elwyn's interest was immediately piqued. After chatting with the mermaid for a while, he waited to the side for the activity to begin.
More than an hour later, more and more mermaids emerged from all directions, their numbers reaching more than five hundred.
Many of them didn't live in this lake, but rather settled in other waters near Hogwarts.
Even in the centaur tribe's central lake, there were traces of mermaid activity.
They rushed over from all directions, and many of the mermaids looked curiously at Elwyn.
They pointed at him, and covered their mouths with their hands and whispered.
The things that Elwyn brought over had long been snapped up more than forty minutes ago.
All kinds of magic materials and herbs filled the two cloth bags that had been expanded by the Traceless Stretch incantation.
A large number of mermaids floated above the square of the mermaid village. The sacrificial activity had begun. An extremely peculiar scene appeared in front of Elwyn's eyes.
The mermaids slowly swam in a circle, in the middle some of them began to sing in unison.
Their voices sounded very strange, but very pleasing to the ear. It was completely different from the mermaids' usual voice.
Even the language seemed different. Elwyn couldn't understand it, but this beautiful song was the sound of mermaids singing in his impression.
They danced and sang around the square. Although they were in the depths of the cold lake, the atmosphere became more and more enthusiastic.
The so-called ancient sacrificial activity now looked more like a grand celebration.
The mermaids let Elwyn join them, and they slowly danced forward according to a special trajectory.
In front of the square stood a crude statue: an adult mermaid carved from a boulder.
When the sacrificial activity reached its peak, Elwyn discovered that the entire space began to emit a strange magical fluctuation.
The mermaids themselves and their singing did not have any magical power, Elwyn had already confirmed this!
But these singers seemed to be able to resonate with the huge mermaid statue, and cast a strange magic, a magic that only mermaids could use.
Although the power was not very strong, but the rumbling sounds constantly resounded from inside the statue.
Elwyn stopped, and looked at the huge statue vigilantly.
"Don't worry!" A mermaid beside him said with a smile, and continued to dance.
Not long after, a deep crack appeared at the tail of the mermaid statue, as if a door had been opened, and the lake water quickly flowed in.
The mermaids did not enter, and continued to dance in welcome, but hinted to Elwyn that he could enter.
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