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By ten o'clock in the evening, all the Hogwarts students had already returned to the common room. The castle was silent at night, with the occasional cough from Filch, and some of the armor that had not been oiled for a long time would creak and move a few times, and the ghosts walked freely through the castle, which seemed to be no different from the old days.

In the corridor to the right of the fourth floor of the castle, if any wizard is interested in casting the magic of the True Eye, a young wizard who has cast a phantasmagion spell on himself will appear, standing in front of a locked door.

"Beautiful, erudite Ravenclaw, do you really want a helpless little wizard to face a ferocious three-headed dog of hell?" Silver discussed the amethyst necklace on his chest in a pitiful tone. "Little slippery Silver, don't think that you can fool the wise Ravenclaw by saying a few nice words, the little three-headed dog behind the door has only a meager Cerberus blood, and it can't be called the three-headed dog of hell at all. The true three-headed dog of hell is in the blood of Cerberus, breathes the poisonous breath of the underworld, is proficient in the three elemental magic of ice, fire, and thunder, and is ferocious and violent, even if I am in the middle of a complete victory, I may not be able to escape with my whole body. But this juvenile three-headed dog that can only rely on physical hand-to-hand combat and has thin blood can make it fall asleep obediently with a tune. Your little slippery head is not under the average adult wizard, and you are embarrassed to say that you have no power to restrain the chicken, I can tell you that if you can't get the saliva of the three-headed dog as a neutralizer, that potion will not be able to be successfully blended, and your mental power will be greatly reduced at that time, and your magic power will be greatly affected. "There was a Ravenclaw voice in the necklace, but the elegant voice was full of banter at this time, like a bad character of the royal sister teasing Xiao Zhengtai." Dear Ravenclaw, why didn't you tell me in the first place, will the consequence of performing the soul transfer technique be a significant decline in mental power? Silver said through gritted teeth. Ahaha, isn't it because I forgot about it for a while, besides, as long as the spiritual enhancer can be successfully configured, not only can the little spiritual power you lost be replenished, but it is even very likely to be greatly enhanced. Ravenclaw said slyly, "Besides, you are my student, and you must not see me in a small crown with that filthy soul, which is very rude for a lady." Knowing that Bicker was no match for Ravenclaw, Silver had to concentrate and begin his mission of collecting the saliva of the three-headed dog.

"Alaho Cave Open!" The lock clicked, and the door opened suddenly, and Silver hurried through the door and closed it again. Silver heard a low bark and a frantic twitch of his nose. Silver flicked his wand and said, "Fluorescent flicker." The dimly lit room lit up, and Silver was facing the eyes of a monstrous dog that filled all the space from the ceiling to the floor. It had three heads, three pairs of vicious eyes that were dripping and turning, three noses, twitching and trembling in their direction, and three drooling mouths, which hung from the yellowed dog's teeth like slimy rope. The three-headed dog roared, showing its sharp teeth, and seeing that the three-headed dog was about to attack, Silver unhurriedly cast a loud voice at himself, cleared his throat, and began his performance.

"When you're alone, it's not that you don't want to be missed

When I'm alone, I'm just afraid to miss you

When you are alone, if it rains

It will also learn from you to put the umbrella and throw it aside

At the tail of July, you are a Leo

Prelude to August, you are a Leo

When you meet, if it's an accident

When I parted, I couldn't see it unexpectedly

I don't change my dead nature, but I don't dare to love hard

Short women can also be sexy and cute

There are mountains and seas of people, don't miss that one waiting

Try to love, hurt is more refreshing than sorrow

Just this time, I don't want to be a singer

If you can, you can also write songs for me

Please don't ask, what month is Capricorn?

Please don't say that only friendship can live forever

The sound of the sheep, one of the ultimate meanings of music from another crystal wall system, sounded in the room, and the barking of the big dog ceased—it staggered a few times, fell to its knees, and then fell to the floor and fell into a deep sleep. "Hmm, the sound of the sheep is really extraordinary, and the power runs through the infinite crystal wall system." Silver exclaimed. "Oh my God, what kind of song are you, I can't stand it!" Ravenclaw yelled at Silver in no woman's manner. "Don't be angry, honorable Ravenclaw, and keep your unfazed demeanor at all times." Silver explained. "Save it, God knows where you learned your disgusting singing, hurry up and collect the saliva of the three-headed dog." Ravenclaw said angrily. "Got it, ma'am." Silver pulled out a crystal tube and began collecting the three-headed dog's saliva. "Ah, it's disgusting." Silver finished collecting the saliva and wiped his hand stained with the saliva of the three-headed dog on his robe.

"By the way, Silver, I've always wanted to ask you, how do you know there's a three-headed dog here? Although this three-headed dog has a thin bloodline, it is not something that can be found casually, does the current headmaster of Hogwarts like to put this dangerous monster in the school? "Of course not, this three-headed dog is used to guard the Philosopher's Stone." "What? Philosopher's Stone? The failed product of those dangerous madmen alchemists? Ravenclaw wondered. Why, dear Ravenclaw, do you know anything about this thing? Silver asked. That is natural, the magic stone that is popular in the wizarding world is actually a failed product produced by ancient alchemists when producing the Philosopher's Stone. The alchemists originally wanted to create a philosopher's stone that could turn any metal into pure gold and also make an elixir, but it backfired, they could only make a defective magic stone, and the magic stone could only convert metal into silver of low purity, and create a life extension potion with strict side effects, which could not meet the predetermined expectations at all, and the cost of this magic stone was scary, and over time, this thing became less and less, at least in my time, there were very few magic stones, how could there be one at Hogwarts now? And you still take the trouble to send the first three-headed dog as a guard? Silver was surprised: "No, why is it said in the book I read that the Philosopher's Stone can be turned into gold to make the elixir of life, and the famous alchemist Mr. Nicolamay also lived six hundred and sixty-five years old, and now lives in seclusion in Devon with his wife." "What is written in the book is not necessarily right, the Philosopher's Stone has no effect of gold, although the effect is good in prolonging life, but it needs to be taken constantly, once it is broken, you can only close your eyes and wait for death, that Nicolame must be very rich, otherwise he simply does not have the financial resources to make so many Philosopher's Stones to prolong his life." Ravenclaw returned disdainfully.

"Okay, okay, I don't care what the effect of his magic stone is, I only care about whether the potion can be configured successfully today." Silver hurried out of the room and headed for the potion washroom.

"Wait, you haven't told me why you know the Philosopher's Stone and the Three-Headed Dog are here."

"Dear lady, being too curious will make you grow old easily."

"Damn little bastard, if the old lady is still in the flesh, she will definitely beat your ass!"

……