"Tsk tsk, I have to say, Brother Lu really has guts."

Yun Xiao was startled by Lu Zhang's sudden action, but after regaining his composure, he made a cryptic comment that almost caused Lu Zhang to explode.

"Boy, didn't you say there was a problem? I'm still standing here perfectly fine."

Although Lu Zhang was angry inside, he knew this wasn't the territory of Sky Thunder Valley, so he had to keep his temper in check, issuing a cold laugh instead to refute Yun Xiao's earlier words.

"Alas, truly not listening to the advice of the elderly will lead to suffering right in front of you!"

Seeing everyone focusing their gaze on him, Yun Xiao shook his head and sighed. However, this statement only increased the mockery on everyone's faces — this guy, not even twenty, claims to be "elderly," so aren't the rest of us practically halfway to the grave?

"Yun Xiao, what are you up to?"

On the other side, Xu Changgui had a look of doubt in his eyes. According to the information he had received, this young man named Yun Xiao was not a madman. If he said such things, there must be some trick involved.

Yet now Lu Zhang had already grasped the Fake Heavenly Vine Flower, and nothing had happened, which implied Yun Xiao's earlier words weren't necessarily true, prompting a conflict in Xu Changgui's mind.

"Just watch!"

Yun Xiao glanced at Xu Changgui, then suddenly turned his head towards the sharp-nosed stall owner, and said softly, "Boss, can you extend your hand for me to see?"

Upon hearing this, everyone felt a stir in their hearts, as Yun Xiao had previously mentioned something "just like the stall owner," seemingly about to reveal the puzzling mystery.

"You... What are you up to?"

Even though he absolutely did not believe the words of this lad, the stall owner knew from the mouths of the two geniuses from Sky Thunder Valley that this young man, despite his age, had killed the three Thunder Children of Sky Thunder Valley. He was not someone to provoke lightly.

"Boss, do you want to die?"

Seeing that the stall owner lacked even this sense of awareness, Yun Xiao felt quite helpless, knowing he must use a strong means to make the other party believe him, so he directly asked this question.

"Isn't that nonsense? Who would want to die for no reason?"

The onlookers secretly cursed in their hearts, then watched as the coarse-clothed youth stepped forward, grabbed the stall owner's right wrist, and pulled up his sleeve.

For some reason, after Yun Xiao uttered those four words, the stall owner did not resist, even though the chance of dying might be less than one in ten thousand, he instinctively didn't want to take that risk.

"Playing tricks!"

As for Lu Zhang, there was only a cold smile left on his face. He completely did not believe there was anything strange about the Fake Heavenly Vine Flower, at least ever since he obtained it, he had been secretly sensing it but found nothing wrong.

It should be noted that both Xu Changgui and Lu Zhang, having participated in the disciple selection of Lianyun Mountain, are not only outstanding in their Meridian Qi Cultivation but also genuine Earth Rank Low Level Meridian Refining Masters with extraordinary sensing abilities.

Xu Changgui was instead keen with curiosity, staring at Yun Xiao's movements, wanting to see what peculiarity this young man, who killed the three Thunder Children, might possess.

"Is... is there any problem?"

The stall owner, whose wrist was held by Yun Xiao, saw the other party calmly closing his eyes to sense something, he couldn't help but get anxious, and directly asked after a moment.

"No problem? I'm telling you, the problem is big!"

Upon hearing the other's words, Yun Xiao finally opened his eyes, and his first sentence made the stall owner's body tremble. Then he suddenly felt an unusual sensation on his right arm and lowered his head to look.

"What... what is this?"

Unexpectedly, when the boss looked down, his face changed instantly, and his voice trembled, because from his right wrist to his upper arm, a thin silver thread crossed faintly, something he had never noticed before.

"What is that?"

All the onlookers, including Xu Changgui and Lu Zhang, being noteworthy Meridian Refining Masters with decent Power of Soul, noticed the delicate silver thread right away, sharing the same confusion as the stall owner.

Seeing the vendor's expression, it seemed he never knew there was such a silver line on his arm before. Could it be that it was only discovered because of that young man named Yun Xiao? This was rather intriguing.

Especially Lu Zhang, who was known as the Earth Mine. His right hand, which had been tightly gripping the Heavenly Vine Flower, involuntarily loosened a bit, his expression changing indecisively, as if he was hesitating whether to throw away the Heavenly Vine Flower.

Just a moment ago, Lu Zhang had been mocking Yun Xiao for being pretentious. Who would have expected that in the blink of an eye, this young man would help the vendor discover something extraordinary? If he were to throw away the Heavenly Vine Flower now, it would undoubtedly make him a laughingstock at this trade fair.

"Hmph, it's just a silver line, can it really take a person's life?"

Lu Zhang tried to bolster his courage, and after a cold snort, he saw that the rough-clothed boy suddenly tore off the vendor's shirt, revealing a bare body.

"This..."

At this moment, not everyone's gaze was fixated solely on the vendor's bare body, but followed that seemingly faint silver line to under the vendor's shoulder, close to the heart.

"Boss, have you ever heard of something called 'Hidden Thunder Poison'?"

Yun Xiao extended his other hand and gently tapped on the vendor's chest, as if making the end of that silver line sway slightly, and his words caused everyone present to look bewildered.

"Hidden Thunder Poison? What is that?"

Even Xu Changgui, a Heavenly Thunder Child from Sky Thunder Valley, had never heard of this so-called Hidden Thunder Poison. As Sky Thunder Valley was most adept with Thunder Attribute Power, they were likely well-versed in anything related to thunder.

Unfortunately, the Hidden Thunder Poison is rare even in the Nine-layered Dragon Cloud, and since it has the word "Hidden," many cultivators who are poisoned don't even know what caused their death, making it extremely hard to guard against.

"Ha, it seems I asked unnecessarily!"

Seeing the bewildered expressions on the vendor and those around, Yun Xiao laughed at himself. Upon recognizing the Hidden Thunder Poison, he instinctively treated this place like the Nine-layered Dragon Cloud, only now realizing he had asked the wrong people.

"But you don't need to know the origin of the Hidden Thunder Poison; you just need to know that if this silver thread touches your heart, your life will be forfeit!"

Yun Xiao shook his head, his words causing the vendor to tremble violently, his face turning extremely pale, evidently now partially believing Yun Xiao's warning.

"Then… how can it be resolved?"

The vendor looked down at the silver thread near his chest, asking in a dry voice, and after asking, he saw that the boy opposite him had a half-smile on his face.

Yun Xiao did not immediately answer the vendor's question, but instead retracted his arm and turned toward the direction where two silver figures were.

"Brother Xu, Brother Lu, I presume you have sensed the thunder attribute aura within the... that Heavenly Vine Flower, but what I want to tell you is, that is the Hidden Thunder Poison. If you dare to rashly refine it, your outcome might be the same as this vendor's."

Yun Xiao spoke eloquently, and after speaking, he pointed exaggeratedly at Lu Zhang, the Earth Mine, and exclaimed, "Look, look, isn't there a silver line on Brother Lu's wrist?"

As Yun Xiao shouted, everyone's gaze turned to Lu Zhang's wrist, where a faint silver light seemed to be emerging, yet was undeniably real, and it appeared to be emanating from inside Lu Zhang's wrist.

Swoosh!

With everyone's eyes on him, Lu Zhang no longer had the mind to bicker with Yun Xiao. Looking down, he saw the silver light emanating from his skin more clearly than anyone else and instinctively threw the Heavenly Vine Flower away.

At this point, although Lu Zhang did not completely believe that this so-called Hidden Thunder Poison was incurable, at the very least, he knew that his and his brother's earlier actions might become a joke.

In fact, the two brothers came here partly because they saw Yun Xiao, but mostly because Xu Changgui sensed a hint of thunder attribute aura within the Fake Heavenly Vine Flower.

As geniuses from Sky Thunder Valley, the duo had highly keen senses for thunder attribute auras, and they would not easily give up any heavenly materials and earthly treasures related to the thunder attribute. Hence, they previously spent two million gold coins to buy a fake Heavenly Vine Flower.

Originally, Xu Changgui and Lu Zhang believed that even if the Heavenly Vine Flower was fake, as long as they could obtain that trace of thunder attribute energy within, the two million gold coins would be worth it, as enhancing their thunder attribute power had always been their goal.

Little did they know that although the thunder attribute was indeed thunder attribute, it was a highly toxic one, and they had never even heard of this Hidden Thunder Poison before, allowing the rough-clothed boy Yun Xiao to fabricate truths and falsehoods with impunity.

But even so, Lu Zhang had to believe, because if what Yun Xiao said was true, once the Hidden Thunder Poison reached the heart, even immortals couldn't save him. Such a risk was not one that geniuses like them would easily take.

Seeing Lu Zhang throw away the Heavenly Vine Flower, Yun Xiao's eyes gleamed with a hint of a successful scheme. In fact, all he did was make sure these two obediently handed over the Fake Heavenly Vine Flower.