Rias had once traversed the containment of the Tree of Life, so her body held the information of the entire Tree of Life.
This information was extracted and handed over to Yasuri Nanami's body for absorption.
Within a few days, Yasuri Nanami's life essence and strength had reached the level of a Ultimate-Class Devil.
Similarly, the one hundred million illness demons within her body, as expected, underwent a pathological change.
To address this, Rias accelerated the progress of creating the magical device.
Amid countless operating geometric-patterned magic circles, more complex than any machine in the world, endless data flickered continuously.
"Still can't understand it..."
Beside her, Yasuri Nanami, watching the busy Rias, couldn't help but sigh.
"This is the create Equation."
Splitting her focus, Rias explained: "On the surface, these patterns and phenomena involving numbers, text, and magic arrays are just a 'little bit' more complex than ordinary magic circles."
"But in reality, that complex 'little bit' is merely a superficial appearance. The most core element is a power called 'Concept'."
"life, create, Omnipotence, Wisdom."
"Four complete Concepts, along with billions of fragmented ones and other aspects of Concepts, constitute these supernatural phenomena."
"Ordinary magic circles indirectly influence attributes through the array, thereby indirectly affecting Concepts, whereas I directly manipulate Concepts. The manifestation that appears in the three-dimensional world is merely a surface appearance; the true core resides in a higher dimension."
"It is precisely because what you see is incomplete that you cannot comprehend it."
Rias's words made Yasuri Nanami suddenly realize.
Since she couldn't read Rias's mind, she needed Rias's explanation to understand this point.
Logically speaking, her Migeiko mind-reading is essentially the observation of micro-expressions, body language, and other aspects, thus indirectly reading minds, rather than a true supernatural power.
In a case like Rias's, she should still be able to read most of the information.
However, in reality, the information she could obtain was only what Rias deliberately revealed.
As for the remaining aspects, not only did they not enter her brain, she couldn't even comprehend them.
In a pure sense, this information simply does not leak out.
This aspect is somewhat similar to Cthulhu Mythos, but Rias is far gentler than those Outer Gods and Great Old Ones.
The two chatted idly, and after several hours, Rias finally presented the finished product.
It was a crimson butterfly.
But not entirely red; it had a ring of pale green light.
For the most part, Crimson butterflies are red paired with other colors.
The reason it's called a crimson butterfly, besides commemorating her weaker self, is because the crimson butterfly is predominantly red.
As for the details, they manifest the characteristics of magical power and Concepts.
"What is this?"
Yasuri Nanami looked at the butterfly before her, sensing a strange attraction.
As if this butterfly was herself.
"This is you~"
Rias smiled: "Just like your reflection in a mirror, this crimson butterfly is derived from your own origin."
That's right, Yasuri Nanami wasn't simply here to watch Rias work; it was Rias's own request.
There were many ways to solve Yasuri Nanami's one hundred million illness demons. Rias could even straightforwardly destroy the Concept named 'One Hundred Million Illness Demons'.
Doing so would likely allow Yasuri Nanami to perfectly unleash her true innate talent, and she wouldn't have to worry about the threat of death in the future.
But later, Rias discovered that the one hundred million illness demons, this thing born from a heavenly curse, had already become equivalent to a part of Yasuri Nanami.
Even if truly destroyed, their traces could not be completely erased without a shadow.
If in a worldview like Little Garden, resurgence is almost inevitable.
"So this is me..."
Yasuri Nanami came to a realization, then looked at the butterfly and asked, "What should I do?"
"It's simple, just follow your instincts."
Rias chuckled lightly. The butterfly in her hand then circled around Yasuri Nanami once before landing on her forehead and gradually merging into it.
It was as if something scanned Yasuri Nanami's body, then delved into her soul and origin.
The fluctuation from the outside in acted like a key, triggering a sensation that welled up from her very origin.
Under this fluctuation, Yasuri Nanami discovered that the viruses within her body were clearly visible.
In her perception, every type of virus, every entangled, conflicting, and recently mutated virus—its fundamental existence, all its developmental trajectories, its history, extending back even before its birth, to the moment it descended from the heavens—everything became crystal clear.
And besides being clearly visible, there was also—
The ability to control!
Such a feeling surged within her heart.
Yasuri Nanami also understood why Rias told her to follow her heart.
In this situation, the viruses that had tormented her since birth were no longer a threat, but a part of her.
These viruses were like limbs, controllable at will, and she could even prevent them from affecting her.
Even if the one hundred million illness demons evolved again, it no longer mattered.
Perception was the first step; control was the second step; no longer being affected by the viruses was the third step.
Then, the fourth step was convergence.
With just a thought, a fiery red mark with a hint of shimmering green light appeared on Yasuri Nanami's forehead.
This mark was that crimson butterfly, and it was also the viruses themselves.
During her observation, Rias found that she could indeed easily destroy those viruses.
But merely cleansing the viruses from her body, from a higher-dimensional perspective—such as the aspect of personal history—could not be erased.
If encountering a worldview similar to Little Garden, it could very well leave behind future troubles.
The probability of this was actually minuscule, almost comparable to astronomical odds.
However, the future is infinite, and one must take precautions.
Moreover, Rias is a perfectionist.
Thus, Rias thought not of complete 'destruction,' but of 'control'!
And now, Yasuri Nanami had also regained her composure.
"How does it feel?"
Rias asked.
Yasuri Nanami did not answer immediately.
She first gently placed her hand on her chest, closed her eyes, and seemed to be feeling something.
Then she moved her limbs and stretched happily.
As if about to shout with joy, for the first time since birth, such intense delight filled her entire being.
Is Yasuri Nanami strong?
Very strong.
She had endured suffering since childhood; one hundred million illness demons, countless pathologies constantly occurring, countless viruses constantly communicating, fighting, using her body as a battlefield.
From the moment of her birth, she sensed the aura of The End, saw her own The End.
Even so, her body rejected death.
She never felt the joy of life, never experienced the fear of death.
Yasuri Nanami did not resist death; she even had thoughts of ending it all.
But her body instinctively resisted death, so she simply went with the flow.
Even so, she did not possess a stronger will.
Therefore, while the primitive Kars walked a new path, Yasuri Nanami, possessing such talent, died in the midst of madness, with a touch of warmth.
And now, the shackles of fate have been broken!
"It feels wonderful."
Yasuri Nanami revealed a genuinely joyful smile and said: "It's even more moving than the feeling two days ago when I wore panties for the first time and welcomed the first ray of morning sunlight~"
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