On the other hand, Rias interfered with the essence of life through the holy grail, which falls under the category of relying on external forces.
In the microscopic domain, Rias needed the assistance of the Formula to observe and the holy grail to interfere.
Although Rias had long entertained the idea of stepping into the microscopic domain, she had never grasped the key to it.
And now, Rias used the holy grail and the Hōgyoku to modify herself, thereby entering the realm of the Sixth Sense and crossing its threshold.
Based on this, after delving deeper for a period, Rias would be able to enter the microscopic domain.
For a researcher who has reached Rias's level, this holds significant meaning.
It allows for a more complete life form and even better observation and analysis of the essence of life.
Moreover, the essence of superpowers is the Sixth Sense; if properly explored, perhaps even more interesting things could be uncovered.
"Another direction, huh..."
Rias chuckled lightly.
"Rias-chan is a superpower user too?"
Tatsumaki asked, puzzled.
"Originally, no."
Rias explained: "I possess tools that can interfere with the essence of life. Whether it's the Hōgyoku's evolutionary ability or the holy grail's power to overturn the norms of life, I can use them as a basis for modification."
"In other words, I can modify myself into a superpower user, but this requires a template."
"So I'm just copying your superpower."
"You can even do that?!" Tatsumaki exclaimed in surprise.
Tatsumaki understood this point very well.
After all, the organization she belonged to had conducted research on her superpowers, even developing items to suppress them.
Of course, there were also people within the organization deliberately maintaining her extremely poor condition.
Naturally, Tatsumaki was very aware of those researchers' desire for her power.
However, until the end, those people failed to achieve anything, let alone reach Tatsumaki's level.
"The potential of superpowers is not low, but perhaps because the power leans toward the individual's essence, developing it is very difficult."
As she spoke, Rias made a tiny gesture with her fingers and said: "Coincidentally, I have a little bit of research in the field of life."
A little bit was the truth, after all, she had only recently started researching the field of life.
Compared to destruction itself, it was still far behind.
Of course, from the perspective of ordinary people, this 'little bit' would be considered 'a whole lot'.
Including Tatsumaki within this range.
"The power of superpowers leans more toward essence, and your power is immense, but comparatively, it's just that your starting line is farther ahead."
Rias floated up and gently tapped Tatsumaki's forehead with her index finger, saying: "Don't be complacent. The starting line doesn't represent the finish line, but if you rely on your talent and don't run, you'll forever spin around at the starting line."
"For ordinary people, it's already enough, but I think Tatsumaki isn't the kind of child who lacks ambition."
"Of course!" Tatsumaki blushed, clenching her fist slightly and said: "I'll do my best!"
"Mhm mhm, let's encourage each other."
Rias smiled.
Using Heavenly Transfer to return to her room, Rias took out a few pieces of clothing.
After changing Tatsumaki's clothes, it wasn't long before Tatsumaki bid farewell.
Although staying with Rias was comfortable, ever since her sister was mentioned, Tatsumaki's heart had been constantly worried about her.
"Hmm, occasionally like this is nice too."
Rias stretched and murmured.
"Lady Rias."
The door was knocked, and a childish voice came from outside.
With a thought, the door opened, and a small figure slipped in.
Closing the door again, Rias yawned and said: "What's up, little Nelliel~"
"Play with me, Lady Rias!"
Nelliel said energetically.
After returning to the High School DxD world, Rias used the Hōgyoku to heal Nelliel.
Come to think of it, the holy grail and the Hōgyoku also have similarities.
The holy grail interferes with the norms of life, while the Hōgyoku more so interferes with the life norms of the soul.
One represents the body, the other the soul.
The Hōgyoku materializes what a person desires in their heart, developing according to their wishes;
But the condition is needing the strength to realize that wish.
In other words, the Hōgyoku is not a physical wish-granting device, but a spiritual one.
For example, if Rias wished to become rich.
When making this wish, based on the memories in her mind, the Hōgyoku would enhance Rias's abilities in this regard.
Such as sensitivity toward money, financial management, and finance.
Learning related knowledge would also become very easy, absorbing nutrients and growing rapidly like a genius, thus becoming 'rich'.
Come to think of it, she still had an experiment to do, right?
"Later, Nelliel."
Rias patted Nelliel's head and said: "Can you grow bigger and keep me company?"
"Yes! I love Lady Rias the most!"
Nelliel showed a bright smile, then her body gradually grew larger.
Although she healed Nelliel's mask, Rias preserved the form of little Nelliel.
The memories of both are shared, but little Nelliel causes the body and mind to become childlike, while big Nelliel appears more mature.
"Lady Rias!!"
After Nelliel grew bigger, her clothes also enlarged accordingly. This was a special outfit Rias made for her, essentially also a magical device.
After growing bigger, Nelliel excitedly pounced, burying Rias in her soft and ample bosom.
After being excited for a long time, Rias patted the softness in front of her chest, bringing Nelliel back to her senses.
"Sorry, Lady Rias, I got too excited."
Nelliel stuck out her tongue and said.
"It's fine, I'm a demon anyway, not breathing is no big deal."
Rias sat on Nelliel's lap, leaning the back of her head against her soft bosom, using Nelliel as a bed and pillow.
She didn't pay much attention to the posture; it was just to make herself more comfortable.
Rias took out the Hōgyoku and the holy grail, then synchronized the two.
Superpowers essentially already belong to the realm of the Sixth Sense, not just the body's five senses and the brain, but something more fundamental.
The threefold domains of body, mind, and soul.
The body needs no further mention; the mind resides within the body, while the soul is something hidden deeper, more fundamental.
The mind resides within the soul, and the soul resides within the body.
The three are mutually corresponding.
As for whether the soul is born first or the body is born first, there's no need to discuss this chicken-or-egg question.
If one's strength is sufficient, even the rules and history of this world can be changed.
Directly determining the outcome of this question from a conceptual level.
Of course, only 'this world'.
Back to the main topic—
Body, mind, and soul influence each other.
If one wants to delve deeply into developing superpowers, it must involve the essence of these three.
As she delved deeper into these three, Rias's essence of life gradually improved.
No, perhaps this shouldn't be called 'improvement', but rather 'delving'.
These are also two similar yet different domains.
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