Polyjuice Potion, loli succubus only.

That was the answer that Elena gave to the little winged ones, and it was also the price.

As an advanced potion that can turn the drinker into the appearance of someone else, Polyjuice Potion has been used extensively during almost every wizarding war since its creation—not everyone masters advanced Transfiguration, and the potion's scope of application is obviously wider.

Of course, in addition to the complex brewing process and the scarcity of raw materials, Polyjuice Potion itself has many limitations.

It can turn people into anyone of any age and gender, but it cannot turn people into animals, nor can it transform non-humans or semi-humans.

For example, in the original story, Hermione once mistakenly put a cat hair into the potion and drank it, resulting in her becoming a cat-like creature—not the cat-eared girl of later Japanese anime, but a cat-woman covered in cat hair with a distinctly feline head.

The most crucial thing is that this "wrong transformation" cannot be restored on its own over time; it is a type of potion damage.

"So..." Hermione said softly, "if we drink Polyjuice Potion with your hair in it, it is likely to cause a mutation? And this change is likely to be a lasting, uncontrollable potion aftereffect... And from a good perspective, we might gain some of your characteristics, such as magical long hair, enchanting singing voice, shimmering skin... This sounds a bit like—"

"Magical human experimentation, yes, screening for controllable benign mutations."

Elena continued calmly, accurately and clearly summarizing the description that Hermione couldn't find.

Mixed-blood wizards, or rather half-human wizards, cannot take Polyjuice Potion, or rather, they are immune to the potion.

According to the "potion research" records of Nicolas Flamel, Horace Slughorn, and others, this bloodline threshold is roughly around one-half.

This was something she had personally confirmed before—the magical power in Elena's bloodline would firmly lock her own form and directly disperse the transformation power of the Polyjuice Potion. Not even a single hair of hers would change. At Dumbledore's request, Rubeus Hagrid also took a dose of Polyjuice Potion with Gilderoy Lockhart's hair in it, and there was not the slightest change in his physique.

"Madam Pomfrey should be able to treat the state after Polyjuice Potion 'mutation,' but it's only theoretically safe..."

Elena shrugged. Without waiting for Hermione and the others to ask, she picked up a Tarot deck from her desk and put it in her bag.

"Facts have proven that magical bloodlines are heritable—at least from a probabilistic point of view, wizards' descendants are more likely to be born as wizards, and magical bloodlines are undoubtedly the simplest and most direct factor. The significance of this research is particularly important, but the more this is the case, the narrower our scope for formulating plans and selecting participants becomes. The process and the result are equally important; you should slowly understand this principle later..."

The bloodline theory has been prevalent in the wizarding world for many years, and it is clear that there is some truth to it.

The divide between wizards and Muggles stems from magical power.

If she cannot carve out a path, then no matter how hard she tries in terms of law, education, or tools, she will ultimately fail to truly integrate human civilization in the "New Era." From the current situation, various different potion pathways are undoubtedly the most feasible attempts.

Controllable, reversible werewolf potions are just one potion pathway; Elena would not choose to bet on just one project.

"Enchanted evolution" based on Polyjuice Potion is another promising path.

"So, the worst result is that some part of the body will permanently become your shape?"

Hermione looked Elena up and down meaningfully, raising her eyebrows. "Although it's a bit dangerous, I think we can try it. When are you planning to start testing the 'Succubus Potion'? Anyway, I've seen all of you, which will reduce some uncertainty, right?"

"At least wait another month, and it must be approved by the Major Arcana."

Elena explained as she handed the crumpled piece of paper to Hermione, selectively ignoring the teasing in the little beaver's words.

"Here you go. I knew you wouldn't refuse—you can prepare well..."

It looked like a small scrap torn from some assignment parchment.

Hermione curiously opened it. It was a borrowing permission for potion-related books in the Hogwarts Library's Restricted Section, with a flamboyant signature in the lower right corner—Albus Dumbledore. This could be considered the most valuable permission in Hogwarts Castle.

"The making method, contraindications, and potion principles of Polyjuice Potion cannot be found in ordinary textbooks and books. There is a book called *Moste Potente Potions* in the Hogwarts Library's Restricted Section, which records many high-risk magical potions... If you really intend to take the 'Succubus Potion', Hermione, I would prefer you to brew Polyjuice Potion yourself, as extracurricular practice—"

"As for the rare potion ingredients involved in Polyjuice Potion and other potions in the book... they are in the small box under Hannah's bed."

Elena winked slyly, pointed her thumb at herself, and said triumphantly.

"Do you remember when you first started school last year, I fed you boiled Ashwinder eggs, and the theft from the potions professor's office? I have some of the potion ingredients that Professor Snape has, and we also have some potion ingredients that he doesn't have—all unregistered materials."

"Eh, why can't we just buy them through Gringotts? Why use mine—"

Hannah asked subconsciously, looking a little distressed about the little treasure trove she had worked so hard to hide.

Because the white-haired dumpling kissed Hermione in front of Hannah, in order to appease the dissatisfaction in little Hannah's heart, Elena directly handed over all the stolen rare potions to the iron-headed girl for safekeeping. After so long, she had long regarded them as her little treasures.

"Because this signature is not Professor Dumbledore's... right?"

Luna said softly and faintly, slinging her bag over her shoulder and glancing at the note in Hermione's hand.

"Think about it. If you were Professor Dumbledore, would you want to suddenly see several Elenas in Hogwarts Castle one day? This is probably Professor Apocalis signing on his behalf, right? As for why we can't buy them publicly, the reason is self-evident..."

Miss Lovegood didn't finish her sentence, but Hannah and Hermione obviously understood.

"Cough, we have to go to the Great Hall..."

Elena laughed dryly, trying hard to change the subject.

"Well, we can talk as we walk anyway. Elena won't lie—"

Hermione smiled faintly, her amber eyes like the wise goddess piercing through the truth.

"—After all, we made an agreement before."

"Liars, get one hundred times! One hundred times!"

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Grumble!