Seven songs with different styles, each one can be shocking, but together they are no better than noise.

Ixissi very crisply put a soundproofing spell on herself, smiling as she watched the others perform their flavorful "waltzes" in the Serpent's Enchantment to the last note.

There was a loud bang, and the students who were turned dizzy fell to the ground with the flow of water that fell to the ground, and several people with poor concentration even vomited wildly, but few people could notice that there was no trace of water on their bodies and on the ground.

"Thank you for your cooperation." Catherine nodded to each of them before heading towards Ixissi.

"It's the first time I've seen an illusion on this scale." Ixissi blinked in admiration.

"Prize!" Catherine bowed slightly, and walked straight past him back to the dormitory.

Ixissi raised an eyebrow and looked at the others, most of them were still lying on the ground, unable to move, only the third-year students were able to barely get up, and the most outstanding was Draco, who was barely able to tell the difference between normal and except for a little shaking.

Ixissi was slightly surprised, but relieved when she thought of their relationship with Catherine, and just stood with her hands folded and observed the other grades of Slytherin.

Obviously, when they heard that Ixir had broken Catherine's hallucination, these people became extremely angry, but when they saw the third-year cousin, their faces all became extremely pale, even if they knew that Catherine had always added a small stove to them, but after experiencing the most intense melody, they could recover so quickly, which was really dwarfing.

While the others were remorseful, Catherine also cried out in her heart, after all, although her strength had reached the eighth order, the endurance of magical combat could not last at all, and the reason for this was the forbidden spell.

To be honest, Catherine's situation is not at all suitable for staying in the wizarding world. At least not as comfortable as in the Muggle world, because the existence of forbidden spells not only hindered her ability to sense magic, but also made her magic regain extremely close to zero, until the wand exploded, opening a crack in this powerful defense, allowing her to act like an ordinary wizard.

It was precisely because she knew where her weaknesses lay that when Catherine reached the eighth order last year, she didn't want to make a big deal about it, even if she accidentally obtained the snake ring. also deliberately made an excuse to delay it for a year, the purpose was naturally to find a way to solve this forbidden spell, but when it really lost its effect, she couldn't even leave Hogwarts.

Forced by reality, Catherine had no choice but to restore the forbidden spell to its original function, of course, she did not forget to turn the original crack into a small opening, but it was still much slower than the mana recovery speed of other people, so if she could deal with the challenge of all Slytherin with magic alone. She was left to the mercy of others, and finally gained a "good name" like "indestructible turtle shell".

So in order to be able to win this challenge, and to make all the challengers feel intimidated by their own strength, Catherine has spent almost the past week recuperating. It all cost her, but in the end, she found that she couldn't achieve the effect she wanted by using other methods other than the illusion of the mermaid queen Ruona.

Speaking of which. It is necessary to explain the difference between the illusion of a mermaid and the illusion of a wizard.

The merfolk's illusions are actually the same as ice magic, which is an upgraded version of their innate water magic, except that the latter uses the solid form of water. The former, on the other hand, uses the gas form of water to create realistic light and shadow effects, like a famous mirage.

In the illusion of wizards, it is not only the water element that is driven by magic, but also other elements, such as wind, earth, fire, etc., so it is not only the vision that is affected, but also the hearing, touch, and temperature difference, which will be disturbed in a large way.

Overall, mermaid illusion is like putting you in a stereoscopic movie with poor acoustics, while wizard illusion is to create a virtual environment. If you compare the effects of the two, the advantages and disadvantages of the two are naturally clear at a glance, but the more elements you affect, the greater the magic power consumed.

Therefore, wizards' illusions are very advanced magic, at least in Hogwarts, only seventh-year students have access to this knowledge, and there is no professor in the whole of Hogwarts who has enough knowledge in illusions, even Dumbledore, who has lived for hundreds of years, most of them are theoretical knowledge.

As for the illusion of the mermaid, as long as the talent is more outstanding, they can be mastered, so there are at least three illusionists among the ten mermaids, and the illusion masters are even more endless in the history of the mermaid, but because they are born unable to control other elements, only Ruona alone can reach the Cheng dù that can be comparable to the wizard.

It's just that Ruona has long since passed away after all, and all that remains in the wand is a trace of residual thoughts, if it weren't for the blood beads on Catherine's body, this mermaid queen wouldn't even be able to wake up, let alone use her unique illusions, but even so, the illusions she can use now are much inferior to those she used in her lifetime, and if the caster desperately resists, she can completely break free from it.

Therefore, in order to ensure that the illusion proceeds smoothly, Catherine also borrowed hypnosis knowledge from the Muggle world, such as completely copying the lyrics of the Hogwarts school song conjured by Dumbledore, and playing seven songs at the same time, the purpose is to make the challengers spontaneously recall the chaotic scenes when they sing the school song every year, so that they can actively have negative psychology such as avoidance and panic.

None of these are the most difficult, though.

Since Ruona's illusions have now returned to the limits of ordinary mermaids, Catherine finally decided to cast a levitation charm on each challenger in order to prevent some thoughtful challengers from seeing the flaws.

This sounds pretty simple, but the problem is that the Levitation Charm has to wait for her wand to spew out the "water", and all the "water" must be done before the entire Serpent Barrier fills the entire enchantment, so that the challenger can mistakenly think that he is floating by the "water".

Later, in order to show her "control power", Catherine also deliberately divided the "drifting" challengers into seven layers according to grades, and deliberately expressed "ease" - in short, when she waved her wand and began to direct the "play", her eyes were completely blank, and her mind was even more confused, and it was not until the illusion was over that she roughly regained control of her body.

Of course, the effect was extraordinarily significant, and none of the Slytherins realized that Catherine was using tricks at all, although they both intellectually felt that what had just happened was impossible, especially Ixissi and Draco, who knew very well that the red-haired girl's strength simply could not do this.

Most people thought that Catherine had asked Snape for some temporary power-boosting potion, and that she had indeed left the common room a little faster than usual, but she had not found any signs of the after-effects of taking potions, which was even more puzzling.

Actually, Catherine hadn't thought of using potions, but something like that Snape had been so strict that she had never been able to get hold of it before; Second, there are some contradictions in the current relationship with Snape, and she can't ask him directly for it without face or skin; Snape's nature was to never allow her to use potions that would boost her strength after she had just recuperated for a week.

So as soon as this thought flashed, it was directly passed by Catherine, not to mention the use of mermaid illusions, there is an advantage, that is, pretending to be mysterious, because the more mysterious it is, the more it is impossible to understand something, and it will make people more and more afraid, which is exactly what the red-haired girl has repeatedly taught the SG group in the past month.

It's just that this method, especially the step of casting the levitation spell and controlling it multiple times at the same time, is indeed extremely difficult, if it weren't for the super good luck that Tracey casts with the illusion form, Catherine will definitely mess it up, and borrowing the good luck of the blue bird is not without a price.

Catherine's research over the past two years has found that if she has bad luck for a period of time and doesn't let her pet help change her luck, then after this period of time, she can unconditionally let Tracey show super luck, otherwise she will be hospitalized for a week because of a small cold like she did in the first grade.

So when she learned that she had to recuperate in the medical wing for a week, Catherine immediately chased her pet away from her, ignoring her pet's complaints; It was only when she went into a magical riot on the train that Tracey turned into a phantom and forcibly changed her luck, so that she finally saved herself.

This meant that Catherine had to pay a price at the same time as an advance payment.

Therefore, Catherine has actually been "tossed" badly by Madam Pomfrey in the past week.

To sum up, Catherine will definitely not allow her "challenged plan" to fail!

Thankfully, in the end, she succeeded!

Otherwise, Slytherin, and Hogwarts as a whole, will only be in dire straits for the next year.

Of course, Catherine's desire to make friends between two houses that had been hostile for millennia would have made the academic year chaotic.

But as long as she doesn't keep that bright smile all day long, it's still an acceptable thing.

It's just that this thrilling thing, except for Tracey, who has a blood contract with Catherine, no one else knows at all, but it doesn't know everything, after all, because of the forbidden spell, the two of them are often in a state of poor communication, if it weren't for the red-haired girl's love in recent days, which has become more and more irritable, so that the blue bird can understand the master's thoughts.

But in any case, seeing that the owner, who had worked hard for a week, was now lying on his back on the bed with a satisfied face, Tracey couldn't help but move her body, which was now a little fat, and landed on Catherine's head, and lowered her head to help her get the hair that swept to her eyes aside. (To be continued......)