The maid squad is too strong, what use is there for me, the Demon King?

Therefore, the only person who could possibly build the Demon King's Castle is one of the previous ten Demon Kings.

The Demon King's lineage begins with the tenth Demon King, the "Sage," and there is no record of the previous nine Demon Kings. Gray has also not found any other way to find out the information of the previous nine Demon Kings, so it is impossible to verify whether the Demon King's Castle was established by the previous nine Demon Kings.

The tenth generation Demon King, "The Sage," who is recorded in the records, is similar to the Demon Kings after the tenth generation. There is no information about him entering the desert or establishing a Demon King's Castle, and there are also no large gaps in his information.

The only thing to note is that while the "sage" wasn't exactly friendly towards humans, he didn't wage war against them as recklessly as other demon lords.

On the contrary, those who are dedicated to developing the lives of the demon race have almost never initiated wars against humans.

Therefore, the "Sage" generation of Demon Kings appeared a long time after the Demon Kings were born. And because this "Sage" was too lazy to care about heroes, that generation of heroes also took a very long time to develop and grow to the point where they were strong enough to kill the Demon Kings.

The "Sage's" fate was no different from that of other demon kings; he met his end by the sword of the hero.

The only difference is...

The "Sage" lived for a very long time, making him the longest-lived of all the Demon Kings in history.

His reign lasted for over a hundred years.

(Looking at it this way, the Demon King doesn't seem so dangerous after all; if handled properly, he can live longer than an ordinary person...)

Although still below the average endurance of professionals)

Only the "sages" who have lived the longest have the time and the ability to build the Demon King's Castle.

In conclusion, the most likely candidate to establish a Demon King's City in the desert secret realm and send a demon bloodline to reside there is that "Sage".

Once the projection appeared, Gray was certain that all of this was the work of the "Sage".

Now, Gray's biggest question is about the "Sage," since there are no records of him building the Demon King's castle, nor are there many blank spaces.

How did he build the Demon King's Castle?

However, it is understandable.

If even he couldn't be fooled by the information passed down from the Demon King, then how could he possibly "deceive the heavens and the sea" and fool the one in heaven?

The "sage" in the projection slowly raised his head, his eyes, composed of light and seemingly containing stars, precisely "gazing" in the direction of Gray. A faint, weary yet gratified smile seemed to curve at the corners of his lips.

A gentle, clear, yet distinctly inhuman young voice rang out in the vast underground space, echoing deep within Gray's consciousness:

"You came……"

"It's much later than I expected... many years later..."

"The Demon King who will inherit my will in future generations."

His voice was calm, yet it seemed to contain the weight of eternity.

Just as Gray was concentrating on the "Sage's" greeting that transcended eternity, the scene before him suddenly underwent a strange change.

The lifelike "sage" youth, composed of light and shadow, suddenly flickered violently a few times as if there was a signal malfunction, and then froze.

He maintained a slightly raised head and a smile on his lips, but he completely lost all his liveliness and became a perfect, still sculpture of light and shadow.

At the same time, in Gray's special visual perception, three translucent squares made of pure dark purple energy, with tiny runes flowing like data streams along their edges, suddenly appeared as if they had popped out of the void and floated abruptly in front of the solidified "Sage" projection.

Within each square, a line of clear ancient demonic script is outlined by the same style of dark purple light patterns, accompanied by a faint but distinct fluctuation of spiritual intent to ensure its meaning can be accurately understood:

[Option 1: I already know many secrets about [the Celestial Realm] and others]

[Option 2: Please explain in detail]

This familiar, almost game-like interaction stirred a ripple in Gray's heart.

Although they are familiar, this does not mean that the "sage" is also a transmigrator, although Gray also hopes to meet fellow countrymen in the other world.

But he knew in his heart that this similarity didn't prove anything.

In this world, the quest query interface provided by the rudimentary magic crystals in the adventurers' guilds, or rather, the interactive theatrical selection boxes concocted by some illusionists for the amusement of nobles, are of a similar form.

There is no conclusive evidence, such as "odd changes, even remains the same" or "How are you?", that is related to past life knowledge.

The options box appears here, at the core of the ruins left by the tenth Demon King, who was known for his wisdom.

In an instant, Gray understood.

The "sage" before him was not a remnant of a soul or a projection of consciousness. He could not sense any fluctuation of his soul.

This is merely a pre-programmed, extremely sophisticated magic recording—a message system set to play under specific conditions.

That gentle "You've come," and that slightly sentimental "So many years late," were just lines pre-set at the beginning of the video. No matter who came, as long as the conditions were met, they would hear the same sentence.

The pop-up options box is the query menu provided by this "interactive video". This "sage" demon king is actually using this method to transmit information to future generations who may find this place.

"Heh..." A barely audible, enigmatic groan seemed to escape from beneath Gray's hood. This ancestor, known as the "Sage," certainly had a... unique style.

The frozen projection of the "Sage" waited silently, two dark purple option boxes floating slightly in front of him, radiating an alluring light, as if urging the visitor to make a choice.

This is asking myself how much I know. If I choose what I don't know, they should be able to explain everything about [the Celestial Realm] to me.

In my situation, it's impossible to determine whether I know everything. If I miss some information, I might think I know everything. After selecting an option, it assumes I know everything and automatically skips some important but unknown content.

Then wouldn't he have blown it up?

Gray had no idea whether he could hear both options. This was a question that concerned his own fate, and even the fate of the entire world, and could not be taken lightly.

After a moment's thought, Gray decided that choosing option two—completing the information, even if it was just reading the known information aloud again—was still a prudent move.

Gray hesitated for a moment, then slowly raised his finger and pointed at the second option in mid-air—

[Option 2: Please explain in detail]

You can never have too much information.