The ancient empire.
A country that was said to have existed a few thousand years ago.
The age of myths—-the era in which the gods were said to exist.
There were many gods, but all of them were said to have been destroyed in a conflict between gods.
Humanity, who obeyed the gods, were almost destroyed.
Over the years, the few survivors revived the population.
However, in the process, all of the technology and techniques of the ancient empire were lost.
Their, culture, and history along with it.
What happened at that time?
What kind of people were there?
There are almost no remaining documents about that.
I've lived for 1000 years, but it's from even older than that.
Of course, I don't know the details either.
If it's the old man, then he might be somewhat familiar with it, but he didn't tell me much about it.
Without knowing any of that, I can still use him.
There are many things that are said to be legacies of the ancient empire.
There are no buildings left standing on the ground.
Everything was blown away.
It's evidence that the war was just that intense.
What's left over is just the underground stuff.
Those are what are called dungeons.
Other things left over are buildings in subspaces.
We were in a certain subspace.
What's here is a giant tower that raises up to the sky.
It's the Crystal Tower.
"Come to think of it, this was here wasn't it?"
I look up at the huge tower.
As usual, the material of building is still unknown.
The techniques of the ancient empire are of course unknown to humans, but they're unknown to the evil gods as well.
The entire building was shining lightly, and it was obvious that some sort of power was exerted on it.
"The ancient empire didn't particularly make this place for the sake of training, but it has a function to prevent people from going deep inside it. Furthermore, it's strong, and perfect for training."
The old man explains.
"It's customary for those who challenge the Maou to train up here. 50 years ago, I cleared up to the tenth floor here."
Serena spoke respectfully.
For a weak Maou, clear about 5 floors.
For average~strong, you should aim for about 10 floors.
400 years ago, the seven heroes, the Seven Stars were have said to have cleared up to the 15th floor.
"How many floors are there?"
"I don't know. The current record is 15 floors, but we don't know how high up the 15th floor is."
The old man took a pose of giving up all hope.
This tower is large, even on just the 1st floor.
There is an elevator like device, but we don't know how high up it takes you.
Yufilia and the others will probably aim for the 10th floor or so.
Their objective is to check if there have been any major changes.
I look backwards.
The old man, Jeko, Serena.
Just that much is fine.
"Why are you coming along?"
I ask Adrigori.
"You’re going to the Crystal Tower, and since I know up to the 15th floor, I thought I'd guide you."
I couldn't go out for 1000 years.
However, my men are different.
There were times when they went outside.
At one of those times, he must've had an opportunity to come to this tower.
"I don't need you to guide me. If I have to do this anyways, I'm going to while having fun."
"Yeah yeah, plus we came here 400 years ago. I don't even remember the inside."
"That's because you're an idiot."
To Jeko's words, Adrigori retorts.
The two of them are silently glaring at each other, but of course, I ignore it.
"400 years ago……15 layers?"
Serena knits her eyebrows, and voices her doubts.
"And Jeko……no, that one is a common name."
"The number of people named Jeko in the current time period aren't small in number."
The old man nods.
"This may be rude, but what is your name?"
"My name is Adrigori."
Adrigori bows politely.
"Eh……that's a lie right!?"
Serena is dumbfounded.
"I don't think this is the case, but did you visit here 400 years ago with 7 people?"
"Fumu. As expected, since you're revealing this much information, it seems you're aware."
The old man smiles bitterly.
"I,I knew it, you're the Seven Stars!"
The fourth demonic disaster that happened 500 years ago.
Humanity was taken over by the demons.
That state continued for 100 years.
There were those who rose, and stood against the demons' rule.
They were later called the seven heroes—-the Seven Stars.
They are famous along with the dragon princess for being the first to stand up against the demons.
Within them, there were two mysterious people.
They were the two who were called warriors of light.
Adrigori and Jeko.
Yeah, they're these two.
At the time, I said the same thing.
However, I want to say this one more time.
How did this happen?
"I'm sorry for not knowing that."
Serena hurriedly lowered her head.
"Right now they're just normal people. Don't worry about it."
The old man says with an unconcerned expression.
"Just like I helped you 50 years ago, Adrigori and Jeko helped humans during the fourth demonic disaster. That's all it was."
As evil gods, we don't wish for the destruction of humans.
The fourth demonic calamity's Maou was not trying to destroy humanity.
That's why we just watched it at first.
However, a world that doesn't change for 100 years is boring.
Thus, I thought we should help out humanity a little.
I gave humans what are now called the legendary sacred treasures.
We gathered those good prospects, and trained them.
The ones who were responsible for doing that were Adrigori and Jeko.
After everything was finished, they could still hide their identities, and be treated as mysterious figures.
However, I don't know what they were thinking, and they stood out in many ways.
As a result, they ended up joining the seven heroes.
"We,well, it was because Jeko was being an idiot……"
Adrigori tries his best to make an excuse.
"Ha!? You were the one who happily went and destroyed a group of demons alone!"
"If someone asks you to help them right in front of them, of course I have to help them!"
"It's been 400 years, quit it with the excuses!"
When I say that, disgusted, their quarrel "pishari* stops.
"Since 400 years have passed, only people like her who have access to a considerable amount of information would realize it, so there isn't that much of a problem."
The old man coolly answered.
Although they were people with unknown identities, nobody would think that they'd live for hundreds of years.
Since the fourth demonic calamity, names such as Adrigori and Jeko came to be used frequently.
It's not uncommon for a child to be named after a hero.
That's why, even if they name themselves by those names now, nobody will notice.
Serena has just now finally realized it.
As time passes, it will be forgotten.
I judged that at the time, and in reality it went exactly as I thought it would.
As expected, I told them not to be rampage too much.
I told them not to beat the top executives or higher.
Ah, also after everything was over I punished them.
"Wha, yeah."
Since she was taken aback, Serena can only respond like that.
"Don't mind it let's move on."
When the old man said that, he opened a huge door tens of meters long with the huge key.