"Chief! Dragon! What I heard with my own ears was definitely the dragon's roar!"

The young fisherman who had just escaped from the lake looked frightened, and even his voice was trembling.

The wet scales on his body turned slightly white due to excessive panic, and there was an unconcealable fear in his eyes.

"He...he disguised himself as a student and sneaked into the Black Lake! What should we do!"

The surrounding water surged slightly because of his shout.

The other mermaids around them all stopped what they were doing, and even the singing that was rising and falling like a sea wave stopped suddenly, as if the air had solidified.

Circles of bubbles slowly rose, and all the mermaids' eyes turned to the leader in the center.

It was a female mermaid with slightly pale skin and dark green hair, but it was much thinner and was fluttering gently with the water flow.

Although her facial features have become somewhat rigid due to the passage of time, her eyes are still as sharp as knives, exuding an unquestionable majesty.

The surrounding mermaids heard the young mermaid's words and whispered among themselves, and their nervousness spread like a whirlpool.

"Dragon...how can there be a dragon at the bottom of the lake?"

"Is it the work of dark wizards? They can do anything!"

For a while, whispers were heard one after another.

The mermaid leader slowly raised a hand covered with tiny scales to signal everyone to be quiet.

The lake became calm again, and only the low hum from the depths still echoed faintly.

She said solemnly.

"I have tried to contact Dumbledore just now, but he is not at school."

As soon as these words came out, there was another commotion all around.

"Dumbledore is not here? Who will take care of this matter?"

"Did he leave us here alone?!"

The mermaid leader glanced around sharply, suppressed everyone's panic, and then spoke slowly.

"I heard the centaurs in the Forbidden Forest mention it before... Dumbledore had a Norwegian Ridgeback raised on the edge of the Forbidden Forest."

This sentence was like a huge stone hitting the bottom of the water, causing an uproar immediately.

"What?! Norwegian Ridgeback?!"

"Oh my god, that's our natural enemy!"

"Is he crazy?! He brought something like that here!"

There were exclamations and roars all around, as if the water in the lake had been muddied by this emotion.

The Norwegian Ridgeback is a notoriously ferocious predator, especially for aquatic creatures, it is a nightmare.

The mermaid leader's face became increasingly gloomy, and his originally pale skin seemed to have a hint of gray.

Her eyes swept over the clansmen in front of her, her eyes filled with determination and determination.

"Everyone,"

She spoke slowly, her voice as deep as the undercurrent at the bottom of the lake.

"We have lived here for thousands of years. When our ancestors made the pact with Salazar Slytherin, we had absolute rights to this land."

She paused and raised her head, a sharp light shining in her eyes.

"Today we fight for our rights and defend our homeland!"

The mermaids around them all clenched the weapons in their hands, and some even gritted their teeth, with fighting spirit igniting in their eyes.

Their scales shone slightly in the water, as if they were ready for battle.

The mermaid leader's voice deepened, with an unmistakable harshness.

"If Dumbledore can't give us a satisfactory answer..."

She paused for a moment, her eyes swept over everyone like razor blades, and then coldly uttered a few words:

"Then let's kill that dragon ourselves!"

"kill!!!"

——

Hogwarts Castle.

Underground classroom, a dedicated laboratory for Potions professors.

This place was in a mess two days ago, but now it looks brand new.

Devereux stood at the door and couldn't help but marvel again at the magic of the wizard's cleaning magic - he remembered that when he passed by here not long ago, the laboratory looked like it had just been demolished by a mountain monster, with tables and chairs overturned and bottles and jars broken. There were even traces of scorch all over the ground.

Snape was standing at the table, lowering his head and fiddling with a cauldron filled with viscous purple liquid. The iron spoon in his hand slowly stirred the liquid surface, making a faint sound of "chichi".

His iconic black robe swayed slightly with his movements, like a bat ready to pounce at any moment.

Hearing the footsteps, Snape raised his head, and his sharp eyes like a hawk instantly locked onto Devereaux.

"Where did you go? Are there still water plants hanging on your head?"

Upon hearing this, Devereux quickly took off a green thing on his head, shook his head and said.

"Nothing, it's okay. It might have stuck on it while eating just now."

Snape raised his eyebrows slightly but said nothing.

Then he threw a piece of test paper to Devereux.

"The effect of this medicine is more obvious than initially imagined. Just drinking the medicine once can transfer nearly half of the curse in the body, so it stands to reason that only two treatments are needed."

Snape's voice was low and steady, but there was a rare hint of pride in his tone.

Devereux was suddenly shocked.

What the hell? !

He quickly picked up the piece of paper and read it. It said that the dark magic index in Percy and Luna's bodies had dropped significantly.

Devereux was in disbelief.

"Professor, are you saying this is the effect of our medicine?!"

Snape nodded slightly.

"To be precise, it is the amplification effect of the confounding agent under certain conditions."

Snape continued to explain, his voice as calm as ever.

"According to our observations this week, the magical fluctuations in the patient's body were greatly stimulated during the transformation process, which indirectly promoted the efficacy of the confounding agent. Therefore, as long as we let the patient take the confounding agent one day before the full moon night, when the moon is full, the efficacy will be naturally amplified, thereby accelerating the treatment process."

He said this, and it was difficult to hide a trace of pride in his expression.

"In other words, the treatment cycle will be greatly shortened. Similar to the working principle of the polyjuice potion, the patient can be cured after only two full moons."

Deverot stood there, frowning slightly, as if thinking about something.

He raised his hand and said thoughtfully like a student thinking about a problem in class.

"Professor, what you mean is that as long as we find a way to actively stimulate the curse in the patient's body, we can achieve this effect in advance, right?"

Snape glanced at him and nodded.

"That's the theory. What are you thinking about?"

Deverot smiled crookedly.

"Professor, I think we may not need to wait for the full moon."

Snape:?

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