Chapter 271.1. What Does The Night Of Magic Mean?

Ragnarok. It signifies the twilight of the gods in Norse mythology. That’s the final day when Odin and the others perish in the ultimate war. 
Heimdall blows the Gjallarhorn to signal the beginning of the war, and the gods of Asgard, along with heroic spirits, contend with the forces of the giants, the Children of Muspel. 
Fenrir and Jormungandr run amok, and Odin is defeated. It’s a familiar tale where all 9 worlds that once existed around the World Tree Yggdrasil get shattered.
Everyone perishes, and the world transitions into a peaceful and silent realm. 
Mimir’s Head used to belong to an old man named Mimir who knew everything. Odin cut off his head and turned it into a Sacred Artifact.
For one who knows everything, one would think he should have fled before getting beheaded. 
However, if it’s Mimir’s Head, which is known for knowing everything about the entire cosmos, it would certainly possess the memories needed to reshape the world.
“Who is the culprit?”
“I don’t know. Well, I can imagine. It was probably an ambitious plan. Someone endlessly repeated the world with humans until the Golden Threads were damaged and became fragile. It’s a reckless plan that could take thousands, or tens of thousands of years.”
“Oh, I see. It’s impossible for me. I’d get bored and take a nap right away.”
Well, it’s time to sleep. It’s already midnight, after all. 
Suddenly, Odin grabs my neck roughly and glares at me. Well, the original world is already in the middle of the night, right? This conversation is going to be long, and I want to sleep.
“It’s a good thing that the young lady has her own pace, but did you understand the meaning of the Night of Magic?”
“By using sophisticated magic, they created an eternal night, repeating the predetermined world. So, it’s the Night of Magic, right?”
“Your intuition is good, but that’s not all.”
“Hmm? Is there another meaning?”
Considering the title, I can’t think of anything else.
“Oh, I see. You mean, why this story of the Night of Magic is known in other parallel worlds?”
Freya timidly interjects and nods in agreement.
“Oh, yes, that makes sense. Why is the history of this world known in other worlds?”
With an intrigued expression, Grandpa Odin continues the story. 
It seems he can deduce the reason as well.
“Not only in this world’s mythology but tales of gods spread to parallel worlds. That means that stories of the gods hold power.”
Information holds power and travels across the worlds. Various mythologies get transmitted to many worlds because the gods’ names contain power. Hmm, so that’s how the system works.
“I see… So, by repeating the loop, the Night of Magic also became a myth?”
Well, if you play the same story tens of thousands of times, some parallel worlds are likely to pick up that story.
“That’s right. And here’s the crucial part: there’s a reason why it gets transmitted.”
“Hmm… Do those worlds receive some signal and affect humans?”
“Those who hold reverence and strong feelings for that god have the potential to transfer their souls to the world of the gods. Just like the Einherjar come to Valhalla.”
So, people who received myths as signals become souls and are reborn, right? I see.
“But what about Nobunaga? Wasn’t Nobunaga a fan of the Night of Magic?”
Nobunaga, a fan? I don’t think so. He had some overpowered abilities, but I don’t think he ever read the Night of Magic.
“That’s another issue. Probably at first, they used humans to try to summon themselves through the Fruit of Life, rather than gods descending. They wanted to repeat the descent of gods.”
“They wanted to summon themselves? Using apostles is a common plot, right?”
They say, “Summon me”, and manipulate apostles, right? I understand. There have been many stories like that.
“That’s right. And another thing. They probably tried to use many people in this world as ‘sacrifices’ to enable their descents.”
“Hmm? So, that’s what the Cult of Nidhogg is about?”
Mii-chan sharpens her eyes and comprehends the flow of the story. She knows Nidhogg is involved here.
And with determination, I say. 
“Let’s continue this discussion at home. I’m tired.”
“Sigh… Alright.”
Grandpa Odin sighs, but I’m tired, after all.
Thinking about the information he provided, I took a break. Freya makes coffee during the break.
In the meantime, I contemplate the information provided by Grandpa Odin.
“Freya, can you make mine an iced cocoa?”
“Y-yes, of course. I’ll bring it right away.”
After careful consideration, Mii-chan realizes that she doesn’t like coffee. She wants cocoa.
“You’re quite the girl who doesn’t stay nervous for long.”
Frigg-oneesan, looks exasperated, but what can I do?
“Mii-chan is still only in the first year of middle school! Besides, I just figured it out!”
While requesting cookies as a side for the cocoa, she turns to Grandpa Odin proudly.
“So, to continue the story, in this strong world, they couldn’t directly bestow divine power. However, they happened to summon Nobunaga’s soul, right?”
“That’s right. Then, upon seeing how easily the souls of humans entered this supposedly sturdy world, they probably came up with the idea of using that method.”
“Ah, I’ve heard before that human souls can traverse worlds when they get reincarnated.”
“It’s a common trope, right? So, they probably used that trope. But how did they bring Mimir’s Head into this world?”
To use the souls of reincarnated individuals, they had to create the Night of Magic. 
To create a repeating world, they needed Mimir’s Head. So, where did they bring Mimir’s Head into this world?
Odin-sensei seems to enjoy explaining, clearing his throat, and summarizing the answers.