He couldn't figure out who left these formulas and what was their purpose.

He pinched his eyebrows, calmed his chaotic thoughts, and continued to search the stone wall for valuable information. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Suddenly, he found a few "multiple-choice questions".

It's the same physics formula, but it's missing a part in the middle and needs to be completed completely. At the back of the formula there are four answers, each corresponding to a button.

It seems that this button is the key point to unveil the mystery, and you must answer all these multiple choice questions correctly.

After recognizing these formulas, Zheng Fei couldn't help but smile.

are the most superficial, the level of junior high school textbooks in the twenty-first century, it seems that this traverser is not very wise.

Effortlessly, he pressed a few correct keys.

The moment he pressed the last one, his feet trembled violently, and before he could react, the surface suddenly fell!

Bang! He fell hard, but luckily it wasn't too high, otherwise his ass would have cracked.

The sudden change startled several Spartan warriors and hurriedly jumped down to protect him.

Zheng Fei, on the other hand, couldn't help but burst out with an exclamation from his throat.

The hidden secrets of the Tower of London are finally revealed.

It's a cave within a hole, and the walls around it are inlaid with shiny stones, perhaps precious stones, that make the small cave shine.

Not far ahead, there was a large chair, and in front of the chair was a large chest that looked like a treasure chest.

Is it really a treasure vault? Zheng Fei didn't care about the pain of falling, walked over quickly, staring at the treasure chest, and a burst of ancient aura greeted him.

He raised his hand and gently brushed away the dust scattered on the lid of the box, then pulled out his dagger and cut through the rotten lock, which had long since rusted, and carefully opened it.

His eyes were full of longing, and countless conjectures drifted through his mind at this moment: crowns, jewelry, priceless works of art?

Well, he had to admit that he was a bit vulgar and only thought about what was valuable.

However, the enthusiasm that had just ignited in his eyes was instantly extinguished, replaced by incomparable disappointment.

In the large box, there was only a long box, a scroll-shaped object, and a book.

Did it take so much effort to get this one?

Zheng Fei pulled his hair hatefully, he couldn't come in vain no matter what, so he picked up the scroll and spread it out.

For some reason, the moment he opened the scroll, he suddenly trembled inexplicably, and that mysterious summoning power surged into his heart again, and it became even more violent.

Due to its age, the scroll has turned a little yellowed, but it is not difficult to make out the lines of English letters written on it.

[Hello, lucky, I've been waiting for you for a long time. You must be the first to come here, because I'm sure that if you read this letter in its entirety, you won't show it to anyone else.

First of all, I have to tell you, I'm a dead man. Belch...... Don't be afraid, I mean, this is a suicide note I left behind, and although I don't want to accept death, I have to admit that I am aging day by day, and I have to prepare in advance.

Ahem, let's get down to business. If you can crack my code and enter here, it means that you must be a wise person, and then I can also entrust you with that glorious and sacred mission.

Introduce myself, my name is Merlin...... What do you say? You've never heard of me? Hmph, that's to blame for your ignorance!

Well, maybe there are too many people with the same name ... Then I'll tell you what people call me, Merlin, the Great Magician.

That's right, I'm the one who helped King Arthur get the sword of the king to rule England, and some people say that I am a god, a son of nightmares and mortals, but in fact, these are just rumors~ Even the great magician is fake, where can I do any magic, otherwise I still need to write a suicide note?

Ahem, don't despair, listen to what I'm going to say.

My true identity is actually a prophet, and I don't know why, but I can always predict what will happen in the future, and believe that there is something in this world that cannot be explained. Every time I close my eyes and fall into meditation in the middle of the night, I can feel countless wisps of fresh wind pouring into my body from all corners of the world, and I get a close connection with the world and make correct predictions.

Sounds amazing, doesn't it? I think, but there are some things that are just like that, that no one else can understand.

Hmm, it seems to be far away...... After the death of King Arthur, the situation in the country began to be turbulent, and the bishop followed my advice to gather all the noble knights and choose a new king of Britain with a sword in stone. The sword in the stone is a sword that is inserted in the rock, and whoever can pull it out can ascend to the throne. Sadly, no one was able to pull the sword out of the rock.

Since there was no better way, the knights unanimously decided to choose the king through a joust, and Arthur King Artoris, who was still a teenager at the time, also went, but he was not eligible to participate in the joust, and Kai, the son of his foster family, represented the family in battle.

However, when Kai enters the venue, he realizes that he has forgotten to bring his sword, so he asks Atollis to go home and fetch it, and Atollis rushes home to find that the gate is locked and everyone has gone to see the tournament. As you can imagine, Atollis didn't have time to return to the tournament to get the key, so he ran to the church and pulled out his sword in the stone and handed it to Kai, much to everyone's surprise.

Suspiciously, they plunged their swords back into the stone, but even though they repeated it many times, no one but Atolis could pull it out. In this way, the knights finally accepted the new king. From this day on, Atolis was honored as King Arthur.

In the early days of Arthur's reign, the young king showed a strong dependence on me, and Britain ushered in unprecedented unity and strength, and he helped the poor and the weak to build a prosperous kingdom, and it was at this time that chivalry and the first knightly codes of conduct were formed.

And the sword in the stone that Arthur drew when he was young to choose a king broke in a duel with King Pelinor due to a battle against chivalry, and King Arthur, who lost the sword in stone, was very annoyed.

So, under my guidance, he obtained the Sword of Kings, which some also call the Holy Sword.

Legend has it that the sword was made in the elven kingdom of Avalon, and was made of gold, with a gem-encrusted hilt and a blade as sharp as clay. Oh~ I knew that the descendants of the Knights of the Round Table forged a weapon called the Eternal Sword in honor of King Arthur, and that knife was really fragile compared to the King's Sword.

I told King Arthur that the sword of kings is mighty, but its scabbard is more valuable, and that whoever wears the sword of kings will never bleed, and you must not lose it. But then he lost the scabbard, what a careless guy.

After all that, I almost forgot what I was going to say...... Oh, remember, whoever is lucky enough to get the King's Sword will be able to rule England.

The sword of the king is placed in the long box in front of you. 】