On the nineth-and-three-quarters of King's Cross station, the express train to Hogwarts is still a quarter of an hour away.

Jon Hart was sitting on the train, and after more than half a boring Christmas break, he could finally go back to school.

Yes, the Christmas holidays in Southampton can only be described as boring, with no magic, few books in hand, no trace of wizarding activity even within a hundred miles, and nothing to do but practice Occlumency every day.

Fortunately, he persuaded Eric and Judy to allow him to travel to London alone and take the train back to school...... Otherwise, this more than half a month of vacation will really be nothing.

Finding a separate compartment, he put his luggage on the pedals while carefully taking out a journal from his pocket.

The old black cover, with the paper inside, has long since yellowed...... It can be seen that this diary has been a little old. From a distance, the whole diary even makes people look a little eerie.

Jon became "Varian Ureon" and spent the whole afternoon searching for it in a used bookstore before finally finding it for fifteen pennies in a second-hand bookstore.

Waiting in the car, he opened it boredly, and then wrote in the blank space of one of the pages:

"Compound decoction, written in the book "Powerful Elixirs", is a powerful potion.

You can add something to the target (such as hair or nails, but mostly hair) and drink it, and it will transform into the other person's appearance for a certain period of time.

The ingredients needed to prepare the decoction include lacewings, crude antimony, leeches for mouthparts, liquid grass harvested during the full moon, powdered ammonium chloride, ear leaf powder, bicornus horn powder, saltpeter, mercury, iron file, and dried African tree snake skin.

The configuration process is more complicated, but there are not many difficulties.

Take about 5ml of compound decoction to maintain the transformation for about 10 minutes;

Take about 50ml of compound decoction to maintain the transformation for about 1 hour;

Taking a large dose of compound decoction (more than 1L) can maintain the transformation time for 24 hours;

However, the maximum transformation time is 24 hours, and no matter how much you take, you can't improve it again.

The original taste of the polyjuice decoction resembles that of overcooked cabbage, but the specific color and texture will change according to the mood of the user towards the target of the transformation. (If you're feeling good about the transformation target, the texture will be okay; if you don't have a good relationship with the transformation target, the texture will be quite disgusting.) ）

Can only be used on human transformations and not on other creatures...... Attempting to transform into an animal can cause extremely serious side effects, and the effect of attempting to transform into a human hybrid with other creatures (e.g., hybrid giants and werewolves) is unknown, but it is likely to be unsuccessful and has some side effects.

After successfully transforming with the Compound Decoction, you can replicate all the physiological functions of the transformation target, such as voice, strength, and intuition...... But you can't replicate any wizard's magical abilities, and you can't expect Polyjuice Potion to turn you into a powerful wizard.

There have been known cases where polyjuice decoction can be used to achieve gender transition, but ......"

After writing a full page, Jon described everything he knew about Polyjuice Potions...... Then, he carefully tore the paper off.

After folding, the letters P-P (short for Polyjuice Potion) were marked on the outside, and Jon tucked it away in a very secret folder in the trunk, along with a small stack of other notes.

......

There was a soft knock on the door of the cubicle.

Jon tucked the journal back into his cloak before looking up, "Please come in!"

"Jon......" The pretty girl with curly blond hair and a somewhat boyish face pushed open the door to the cubicle.

The two of them were in the letters, and they had already met in this carriage.

"Merry Christmas!" she blinked.

"You too, Astoria. Jon nodded.

She sat down across from Jon, and the two exchanged casual pleasantries.

"How's the Christmas present?"

"Gift, great!" Astoria suddenly smiled, "Unbelievable...... That three-sided makeup mirror is amazing, I love it so much...... Mother praised it for being very good, you know, she doesn't usually smile!"

"Really, that's great!" Jon smiled.

"What about you...... Have you discovered the secret I hid in the chocolate frog?" Astoria asked in a low voice, blushing suddenly.

"Ah...... The secret in the chocolate frog?" Jon was stunned.

He didn't like to eat chocolate, and the box of chocolate frogs that Astoria had given him, he just tasted a few and threw them aside.

Who knows what secrets are hidden inside!

"Stupid...... Hmph!" Astoria snorted coldly and turned her face away.

She decided to ignore him anymore.

......

Fortunately, their cold war did not last a few minutes and it ended.

The smiling retail clerk on the train appeared in time to resolve their embarrassment.

While munching on pot-shaped pies and pumpkin cakes together, Astoria's previous displeasure seems to have been forgotten.

After eating a licorice wand, she seemed to remember something.

"I heard ......," Astoria whispered, "Another attack on Hogwarts!"

"Really?" Jon frowned slightly.

"The ghost of Gryffindor, Sir Nicholas, has been killed, and one of your Hufflepuff students, Justin Finch-Finchary!" Astoria said with a serious face, "They were all turned to stone, just like Lady Loris and Colin Creevey before them. Just a few days after we left school. ”

"That's right......" Jon nodded expressionlessly.

As he expected, according to the original plot, Nick and Justin should have been killed at this time...... However, he didn't receive any news about this at Christmas, probably because Hogwarts officials suppressed the news, but he couldn't hide it from a big family like Greengrass.

"I would have written this to you in a letter...... Astoria said no exception: "But my mother stopped me, saying that it could not be passed on casually. ”

"Hmm!" Jon nodded, slowly. "Professor Sprout's mandrake should be ripe in a few months, and the students who have turned to stone will be able to recover, so everything should be back to normal. ”

"You have to be careful!" Astoria suddenly lowered her head and leaned over.

Her voice was low, but full of concern:

"My mother almost didn't let me and Daphne go back to school...... Hogwarts is really dangerous...... Slytherin monsters, they really existed!"

"I know...... And, thank you!"