After chatting, Scarface suddenly remembered something, took out a piece of parchment from his arms, and then took out a bronze badge, and then pointed to the parchment and said, "Anyway, as a witcher, your body is too fragile. Pen? Interesting? Pavilion wWw. ｂiquge。 infoThis is a potion recipe I got in my early years, you can collect all the ingredients yourself, and drink it directly after concocting it, which should make your body a lot stronger. After Luo Beigui took the parchment, Scarface picked up the bronze badge again and said, "Since you have dealt with the iron rhino guy, I can also save some effort." This is a badge that can enter the first floor of the Library of Truth once, and I won't need it right now anyway, so I'll give it to you as a reward..."

"Library of Truth?" Luo Beigui looked at the badge in his hand and found that this thing looked like it was made of copper, but the texture in his hand was completely different from metal. The badge is shaped like two entangled snakes, and a book with unknown characters engraved directly above the snake's head looks mysterious.

Scarface explained, "Go to the city ahead, you show the badge to the front desk of the Witcher Tavern, and then you'll know what the Library of Truth is." ”

After that, Luo Beigui's brain sounded again:

[Hidden mission - "The True Face of the Werewolf" has been completed, 100 trading points have been obtained, and the teleportation time has been postponed to five days.] 】

[Hidden mission - "Don't Starve" has been completed, gain 100 trading points.] 】

[Personal Exclusive Skill - Nightmare (Black King・Left Eye):

Description: This skill is derived from Entropy Enthalpy Poker and the stimulation of personal abilities.

Prerequisite: This skill can only be activated when it is in a near-death state; Depending on the opponent's mental strength, both the caster and the receiver must look at each other for 1 to 3 seconds.

Skill Effect: After successfully activated, the caster will unconsciously fall into the illusion woven by the caster, and the caster can control all objective existences in the illusion, but cannot interfere with the subjective feelings, judgments and behaviors of the caster. Some of the subject's actions in the illusion will correspond to reality.

Once the recipient discovers that they are in an illusion, the illusion will dissipate immediately.

After the skill ends, the caster's injuries will be fully recovered, but all the feelings of the recipient in the illusion will be equally reflected in the caster's spirit.

This skill can be used twice a day. 】

――――――――――――――――――――――

In the next few days, Luo Beigui once again fell into the endless ordeal of wanting to die, and it was not until the morning of the fifth day that he saw the shadow of the city.

The city in front of him is very much in line with the medieval European cities of Luobei Guiyin (electricity) (shadow) - dim skies, thick and crumbling walls, faint torches, armored defenders, and the towering castle in the center of the city.

The city was huge, but Luo Beigui didn't have a chance to wander around, and before he even had time to take a closer look at the city, he was dragged by Scarface to a tavern full of mystery.

After following Scarface's instructions to show the badge to the girl at the front desk in a low-cut cloth skirt, Luo Beigui was ushered into the basement, and in front of him was a stone door engraved with magic runes.

"When you get here, you'll have to go alone, and I'm not qualified to approach this door of truth." The girl at the front desk stopped by the stairs and stretched out her hand to signal.

Luo Beigui didn't ink, and strode directly into the stone gate.

The moment he entered the stone gate, the magic runes on the stone gate and the badge in Luo Beigui's hand burst out with a faint blue magic brilliance at the same time, Luo Beigui only felt a blur in front of his eyes, and when he woke up again, he had already come to a dark stone tower.

There was chaos around, like a rainy night, only a little fire was lit in front of the stone tower, and there was a table at the main entrance of the stone tower, where an old man in a gray robe was sitting, bored and playing a few cards.

Luo Beigui stepped forward, and the old man's eyelids were raised, and an aura of a worldly master came to his face, and his eyes were so thick that they were spicy.

The old man turned over the four cards in his hand, and the front light was given to Luo Beigui. I saw that three of the four cards were engraved with a badge pattern of two snakes on a red background, and one was engraved with a badge pattern on a blue background.

After Luo Beigui saw it clearly, the old man took back the cards, quickly shuffled the cards behind him, and then took them back in front of him, glanced at them, selected a card at random, and said the first sentence: "What color is this card in my hand?" ”

Luo Beigui didn't expect such a play, but he still quickly spoke: "The possibility of red is higher." ”

The old man raised his eyelids again: "Tell me how you guessed..."

Luo Beigui immediately replied: "This question is very simple on the surface, four cards, three are red, one is blue, the probability of three to one, it is easy to think that the probability of choosing red is higher." But the actual situation is a little more complicated than that..."Luo Beigui breathed a sigh of relief and continued, "You are the one who makes the question, and you are also the one who chooses the card. When you decide to let me guess the color of the cards, you have a directivity when you choose the cards, you don't care about the number of cards but the color of the cards, plus you are looking at the cards and choosing the cards instead of random drawing, the number advantage of the red cards has no effect on you... To put it simply, instead of drawing one of the four cards at random, you choose one of the two colors, red and blue, so the probability that you will choose either red or blue is 1 in 2. ”

The old man finally glanced at Luo Beigui: "Then according to what you say, the possibility of red and blue should be the same." ”

Luo Beigui continued: "The origin of this inference is that because you look at the cards, the possibility of selecting each card has changed from a simple probability problem to an uncertain problem dominated by you... That is, your attitude determines the outcome. That's where my last analysis comes from.

When you draw cards with the mentality described above, the probability that you will pick both red and blue is one in two, and the same probability means 'random', so although you are looking at the card to 'choose' the card, but in fact you still only draw one of the four cards at random, and without tendency, the problem returns to a simple probability problem again, so the probability of finally choosing a red card is much higher than that of a blue card. ”

The old man showed his face under the gray robe, smiled, and turned over the cards in his hand, and sure enough, the cards were... Blue!

"Hey, hey, young people have good brains, but they're not very lucky. Actually, what you analyzed earlier was correct, but it was a little worse in the end... When the probability of choosing two colors of cards is 1 in 2, in addition to random selection, my personal personality will also affect the final result, it just so happens that I hate it, I have to like blue... You didn't count that, did you? ~”

Luo Beigui smiled bitterly: "I'm not Sherlock Holmes, how can I reason about your preferences and personality as soon as we meet..."

The old man smiled again, and didn't ask who Sherlock Holmes was, put away the cards and waved his hand, and the stone tower behind him opened the door: "You are good, you can stay in it for seven days... Remember, you can read the books on the first floor, but don't try to go 'down'! ”

Luo Beigui asked with some curiosity: "How many days can you stay at most?" ”

"You can stay as long as you want~"

"Huh?!"

The old man's expression suddenly became extremely kind: "If you win against me, you can stay in it for as long as you want... Do you want to try it? ”

"Hehe..."Luo Beigui didn't bother to talk to him, and walked into the stone tower with a smile.

[Side quest - "Gatekeeper's Trial" has been completed, no monetary rewards, and the teleportation time is estimated to be seven days later.] 】