The Second Brain Hermione was wearing was a failed prototype of the second-generation model Roger was developing after completing his first-generation unit.
While it was a failure, many of its functions weren't weak. Its failure was purely because Roger discovered his research direction had some issues, so it became a discarded plan.
It was just like the previous magical brain modifications.
Not that they didn't work, but Roger had found better options.
"Like this, is it okay?"
Following Roger's instructions, Hermione slightly pulled open the collar of her wizard robe and placed the spherical object on the junction of her collarbone and sternum, letting it press against her skin.
The slightly cool touch made Hermione's skin tighten.
"Yes, just like that," Roger said, taking out his wand and lightly tapping the sphere.
In an instant, the sphere seemed to turn into an illusion, half sinking into her skin and half exposed, looking a bit like... an Ultraman's color timer?
[Second Brain - Activating]
A phantom voice suddenly sounded in Hermione's mind.
"During the activation of the Second Brain, it will use the power of magic to reconstruct your internal body structure."
"Learning from the lessons I and Harry learned before, I've embedded a spell that can influence pain perception into it, so you shouldn't feel too much pain during this process."
"Furthermore, this reconstruction is a pure magical overlay effect, similar to Transfiguration, and doesn't involve any fundamental changes. So, as long as the Second Brain is removed and the magic is cancelled, your body will return to its original state. You don't need to worry about the current discomfort."
"...But, I still feel really unwell." Hermione's expression gradually turned ugly, not from pain, but from dizziness.
Her current feeling was like when she had a fever above 39.5°C as a child; everything she looked at seemed to spin.
"It's normal. After all, it's making some perceptual adjustments. How you feel now is already optimized by me; it was much more terrifying before the optimization."
"..." Hermione fell silent.
It wasn't that she didn't want to speak, but she was too uncomfortable to.
After about three minutes, everything finally ended.
[Second Brain - Loading Complete]
The phantom voice sounded for the second time in her mind. All discomfort gradually faded, and in that instant, she felt the world before her eyes change! "What... what color is this?" Opening her eyes, everything before her seemed unfamiliar.
Not only the light, but even the surrounding wind felt different. In less than half a second, detailed data on humidity, wind speed, temperature, and more appeared in her mind.
She could even estimate the specific length, width, area, and volume of all surrounding objects, as well as other physical properties, just by looking.
"Human trichromatic vision, or the mantis shrimp's sixteen-color vision, are both limited. I referenced the sensory methods of octopuses to construct 'true color' vision for Second Brain users... Don't mind these minor sensory functions; try thinking about 'accelerating'."
Within the few seconds Roger was speaking, Hermione, who had already mentally calculated the number of roots in his hair, had a thought.
The world before her changed again. Roger's voice stretched out, and Harry and Neville's movements became comical.
Everything around them seemed to have slowed down by three times.
However, she was not affected by the distortion of sound and movement, and could still understand what Roger was saying. Her brain's processing power was enough for Hermione to comprehend everything.
"You feel it, right? Everything has slowed down. However, this is just stimulating your mind to overclock, not a permanent enhancement of your actual processing power. It's fine to use it for ten minutes in combat, but exceeding the usage limit will cause you significant harm."
"In addition to mental overclocking, it also has functions like absolute memory, tactical analysis, spellcasting assistance, self-manipulation assistance, and learning planning."
As he spoke, Roger looked at Harry and Neville beside him. "Just telling you might not give you a concrete experience. Harry, why don't you two spar with Hermione?"
Hearing Roger say this, Harry also became a little interested.
He then drew his wand.
A slight smile also appeared on Hermione's lips. Come to think of it, she hadn't properly dueled with any other wizards before.
Only Neville pointed at his own face, looking a bit stunned, "Me fighting Hermione? Seriously?"
In terms of magical studies, Neville had a considerable gap with Hermione.
Was this a match he was qualified to be in? "It's okay, I'm here," Harry said, patting Neville on the back.
After speaking, Harry stepped forward first.
Following the etiquette of wizard duels, the three stood on opposite sides and bowed.
Then, Expelliarmus! A swift spell shot out from Harry's wand.
Seeing the Disarming Charm attacking her, Hermione calmly and unhurriedly, striking faster than her opponent, raised her hand and cast a silent Shield Charm.
The Shield Charm is a spell that can create a magical barrier. Strictly speaking, it doesn't possess iron-like defense, but rather applies a layer of 'magical isolation'.
This is a high-level spell that senior students nearing graduation at Hogwarts would encounter. Hermione had only heard of it before but had never studied it.
But this time...
She found that as long as she willed it, she could cast the spells she needed with the assistance of the Second Brain.
[Spellcasting Assistance]
This assistance function relies on the data Roger had inputted. In other words, Hermione couldn't cast spells that Roger hadn't inputted using this method.
The Shield Charm deflected the Disarming Charm, and Hermione immediately waved her wand.
'Tarantallegra!'
This is a minor curse, belonging to the curse magic system, which causes the target to dance uncontrollably.
Because it falls under the category of curses, a small amount of malice is required during casting.
Hermione wasn't originally skilled in spells from this emotional casting system, but the Second Brain fine-tuned her internal nerves and hormones, allowing her to mobilize her emotions more easily, resolving this issue.
[Self-Manipulation Assistance]
It's not just emotions; when needed, it can be used to accelerate bodily healing or alter the body's appearance, akin to a partial Polyjuice Potion.
Of course, this assistance isn't all-powerful. For high-level magic like the Killing Curse or love magic, intense emotions originating from the soul are necessary.
A flash of red light streaked past, and Hermione's curse was shattered by Harry's Disarming Charm halfway through its execution.
At this moment, Harry's Mental Power had been growing daily after his transformation, and his magical abilities had also greatly improved under Roger's tutelage.
One spell, multiple uses.
Just as the Levitation Charm has the potential for micro-material manipulation, the Shield Charm can erect a mental barrier between two arguing wizards.
Magic isn't a system that converts magical power into 'welding energy' to be released.
The mind is the foundation of magic; theoretically, most spells can have world-altering capabilities if the caster is strong enough.
Don't be confined by the superficial appearance of spells.
The essence of the Disarming Charm is 'magic that eliminates the opponent's ability to attack.'
Aren't spells also a type of weapon that can harm oneself? Much like bullets.
After a brief exchange, Hermione and Harry stared intently at each other, their gazes grave.
Searching for each other's weaknesses.
And then.
"Petrificus Totalus!" Neville's voice suddenly rang out from behind Harry!
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