Morgan le Fay, the witch of Arthurian legend, the half-sister of King Arthur and her primary adversary.
—Note: The above applies only to original mythology.
In the Nasuverse, where the “truth” is that King Arthur was a girl, Byakuya recalled that Morgan’s image had changed significantly.
For instance, her relationship with Artoria Pendragon had shifted from half-siblings to full siblings, and she had evolved from a pure enemy of the King into something more akin to a twisted, obsessive fan.
Furthermore, beyond being Artoria’s sister, she likely possessed two other overlapping personalities.
Of course, none of that mattered right now.
In terms of Byakuya’s true goal for summoning a Caster, Morgan was undoubtedly perfect.
Whether Morgan could grant Magic Circuits to a commoner, Byakuya didn’t know for certain, but it was an established fact that Mordred—an artificial lifeform Morgan created through magic in the twilight of the Age of Gods—could fire beams of light from a sword and was powerful enough to hold a seat among the Knights of the Round Table.
Byakuya was extremely satisfied with the result.
“Given your capabilities, I assume you don’t require me to provide the Magic Power necessary to maintain your manifestation?” Byakuya asked, showing her the Command Spells on his hand.
“I see.”
Through the contract between Servant and Master, Morgan sensed Byakuya’s condition.
“No.
You only need to grant me the ‘right’ to exist in this world.”
“That’s perfect.”
Byakuya nodded and gestured toward Sakura Matou, who was standing slightly behind him.
“We can talk more in a moment.
Let’s wait for my ally to summon her Servant first.”
*Ally…?*
Morgan raised an eyebrow, looking at the little girl who appeared no older than five or six.
The two who had finished their summons stepped aside, and Sakura Matou approached the ritual circle drawn in mercury.
“Big brother, should I write something too?” she asked.
“No need.
You can start right away.”
Byakuya glanced at the “guaranteed pull” he had already secured.
“If things go smoothly, we won’t even have to worry too much about the ultimate outcome of the Holy Grail War.
For your summon, prioritize compatibility above all else.”
“Okay.”
Nodding obediently, Sakura recalled the summoning chant she had been silently rehearsing in her head and spoke it line by line.
Just as it had been for Byakuya, the ritual circle gradually glowed as Magic Power flowed, until the Servant finally manifested.
“Hehe~ I actually didn’t intend to respond, but for various reasons…
I guess I couldn’t help it.
After all, it’s *you* who summoned me, isn’t it?”
A petite figure in the center of the circle greeted Sakura with a beaming smile.
“Hello there!
I’m Kama, the God of Love.
Starting today, I’ll be your Assassin~”
“Eh?!!!”
Sakura let out a cry of shock.
Aside from the color of her hair and eyes, this Kama…
looked exactly like her.
“Huh…?”
Standing behind them, Byakuya was also stunned.
Wasn’t it common knowledge that because of the origin of the word ‘Assassin,’ the Servants summoned in a standard Holy Grail War were usually one of the Hassan-i-Sabbah?
No, wait.
That wasn’t the biggest problem right now.
Assassin, Kama…
Even if he had been a veteran gamer in his past life, he knew exactly what this entity’s true identity was: Beast III/L.
“Are you absolutely sure it’s okay for *something like this* to appear in the Holy Grail War?”
“Oh?”
Morgan, who had realized exactly what kind of being Kama was the moment she appeared, looked on with a hint of surprise.
“Master, do the mages of your era really play such dangerous games?”
“…You know I’m not a mage,” Byakuya replied, refusing to take the fall for the modern magic community.
***
A few minutes later, in Sakura Matou’s room upstairs.
While he wasn’t entirely sure how an existence like Kama could be summoned, Byakuya figured that even if the sky fell, the World’s Will would be there to hold it up.
After checking in with Sakura Matou and confirming she felt fine, Byakuya decided to focus on matters more personally relevant to him.
“Magic Circuits…”
After hearing his request, Morgan asked, “First, let me confirm: Master, do you know the methods for acquiring Magic Circuits when one is born without them?”
“As far as I know, there are two,” Byakuya answered.
“One is to implant an object with mystical properties into the body.
If you can survive the body’s rejection, a part of the physical form will eventually mutate.” He paused.
“The other is direct human modification.”
“Excluding miracles that are virtually impossible to replicate, those two are indeed the optimal solutions,” Morgan nodded.
“Since you’ve already done your homework and are still asking me, does that mean you aren’t opposed to human modification?”
“As long as it’s not as repulsive as this.”
Byakuya flipped open a section of Zouken Matou’s archives detailing the use of Crest Worms for body modification and placed the book on the table between them.
“Tsk…
the concept is there, but the execution is clearly twisted,” Morgan said, glancing at the pages and curling her lip in disgust.
“My methods aren’t nearly as stomach-churning as that, but I must be clear: even if the process is relatively normal, it is still human modification.
Furthermore, I have manifested as a Servant of the Holy Grail War.
This means that unless you find a way to tether me to this world, your modification must be completed before the war ends.
Given the time constraints and the likely limit on resources, even if the process goes smoothly, the quality and quantity of the Magic Circuits you gain won’t be particularly impressive.”
She gestured toward Kama and Sakura Matou, who were currently holding hands like close sisters.
“For example, the total Magic Power produced by all your circuits might be less than that of one or two of that girl’s circuits once they are fully developed.”
“That’s fine.”
Having expected as much, Byakuya waved it off.
“I just need Magic Circuits.
The quantity and quality aren’t important.
If I had to specify a requirement, it would be that the process should look as normal as possible to an outside observer, and preferably without any side effects that are difficult to manage.”
“Though I suspect that level of quality would be functionally useless to you…”
Through the feedback of the Master-Servant contract and their brief conversation, Morgan had already concluded that Byakuya was a powerhouse.
Even if he were transported back to the era of Camelot, his martial arts and tempered physique would make him a formidable warrior.
She shook her head.
“Since it is the summoner’s request, I will do my best to satisfy it.”
She paused, her tone shifting.
“Actually, if you truly don’t care about the quantity and quality, obtaining Magic Circuits in your current state isn’t that difficult.
In fact, while there would only be three, their quality should be well above average.”
“There’s such a good deal?”
Byakuya’s face lit up, but he quickly caught a keyword in her sentence.
“Wait…
three?”
He looked down at the three strokes of the Command Spells on the back of his hand.