In this world, beyond the Ten Great Poisonous Beasts, there existed certain substances of extreme toxicity. These flora also had a ranking, and at the very top were the Ten Great Poisons, acknowledged by the cultivation world.

The Yin Blossom belonged to this list, though it ranked last among them. Even being ranked last among the top ten, it was certainly no ordinary substance.

The Yin Blossom grew only in the Southern Borderlands, a very rare moist poison. It had exceedingly high environmental demands, requiring the deepest parts of a swamp to germinate.

The Yin Blossom possessed an extremely long lifespan, capable of growing for ten thousand years if undisturbed. Before the millennium mark, it flowered once every decade, and the toxicity of the bloom varied with its age.

The poison that earned the Yin Blossom its place among the Ten Great Poisons referred specifically to blossoms over a hundred years old. More precisely, it meant blossoms between one hundred and nine hundred and ninety years old; the poison from a nine-hundred-and-ninety-year-old blossom was the most potent, almost universally incurable.

A peculiar trait of the Yin Blossom was that once it passed the thousand-year mark, its toxicity vanished entirely, transforming it instead into an exceptionally vital medicinal ingredient. This was all information Zhang Yang recalled from memory.

The Zhang family specialized in medicine, granting them a certain understanding of poisons. However, the Ten Great Poisons were even rarer than the Ten Great Poisonous Beasts, and Zhang Yang had never encountered anyone afflicted by these substances over the years, so he hadn't initially considered this possibility.

It was only after meticulously observing Mi Xue’s pulse that he noticed a similarity between her symptoms and the effects of the Yin Blossom poison, which prompted him to ask Zhang Daofeng to check the more detailed records. The car continued to move slowly, and soon the five sports cars following them caught up.

These cars darted aggressively in front of Zhang Yang’s Hummer, accelerating and decelerating repeatedly. Unfortunately, Zhang Yang paid them no mind at that moment.

After a while of playing their game, seemingly bored, the cars quickly sped away. "Ring!

Ring! Ring!" Zhang Yang’s phone buzzed again.

Seeing the number, he immediately pressed the answer key. It was a call from home, and the caller was Zhang Daofeng.

On the phone, Zhang Daofeng relayed the information he had looked up to Zhang Yang. This "checking" was, in fact, a process of recollection, not just his own, but also drawing upon the memories of Zhang Pinglu and Zhang Yungan.

The Zhang family possessed numerous secret manuals. Although all of them had reviewed these texts, recalling every detail perfectly was difficult.

Besides their internal knowledge, they shared external news and rumors they had gathered. The Zhang family members often ventured out for experience, giving them much broader awareness than disciples of other clans.

"Yang Yang, what exactly happened? Who has been poisoned by the Yin Blossom?" After conveying the information, Zhang Daofeng asked anxiously.

The poisons from both the Ten Great Poisonous Beasts and the Ten Great Poisons were never simple to eliminate; even the Medical Sage Zhang family would be helpless without an antidote. Otherwise, Zhang Yang wouldn't have needed to travel to the Heavenly Mountains previously to seek the primary ingredient for formulating the Antidote Saint Pill.

"No one. I encountered a patient on the road with similar symptoms and suddenly recalled it, so I asked out of curiosity!" Zhang Yang smiled and shook his head, glancing back at the sleeping Mi Xue as he spoke.

He withheld the truth because he didn't want Zhang Daofeng and the others to worry. After saying this, Zhang Yang hung up, his brow still deeply furrowed.

With the added knowledge, Zhang Yang could mostly confirm that Mi Xue was afflicted by the Yin Blossom poison, likely from a blossom around a century old. Among the Ten Great Poisons, the Yin Blossom poison allowed the victim to survive the longest after the symptoms began.

The Yin Blossom poison was colorless and odorless, making it easy to administer. However, unlike other toxins that led to rapid death, this poison had a prolonged onset period.

The onset of the Yin Blossom poison could last up to a year. Although a year might seem long, the experience during that time was worse than death.

The poison initially altered the victim’s temperament and personality, making them flamboyant and drawn to intensely stimulating experiences. This craving for excitement would then magnify uncontrollably.

Those poisoned would commit acts they themselves would find unbelievable. For instance, for a thrill, they might dare to leap from a skyscraper; to taste something novel, they might eat their own arm, or even gouge out their eyeballs.

To outsiders, such behavior appeared utterly deranged. If it stopped there, the poison wouldn't warrant a top-ten ranking.

As the poisoning progressed, the victim's actions grew increasingly manic; they would commit anything imaginable. Neither Zhang Daofeng nor Zhang Yungan had witnessed this poison, but Zhang Pinglu had seen it firsthand.

That victim was also an inner-force practitioner. Long ago, before Zhang Pinglu reached the Great Perfection stage, he was called to treat someone who had been poisoned.

Ultimately, Zhang Pinglu could not save that person. Three months after the poison manifested, the victim’s actions became completely intolerable.

He once had a sudden impulse to pluck the stars from the sky; unable to jump high enough, he threw his own child skyward, deluded that the child could bring the stars down. The result, naturally, was tragic.

He was an inner-force cultivator, albeit only at the initial Second Layer, meaning his strength far surpassed that of an ordinary person. Throwing the child with full force into the air, he never considered the consequences of failing to catch the child afterward.

Afterward, he claimed he had only that one thought, acted upon it without question, and only realized the horror of his actions after the tragedy unfolded. This incident caused him to weep uncontrollably for three full days.

When he emerged, his mouth was bloody, and every one of his ten fingers was gone. This was just the beginning of the madness; it escalated.

Crucially, the afflicted individuals remained conscious while committing these acts, even aware of the wrongness of their actions, yet utterly incapable of controlling themselves in the moment. The regret that followed made their torment even more profound.

Many victims of this poison could not endure the agony until the natural death that followed the toxin reaching the heart. They often succumbed to the torment and took their own lives.

The patient Zhang Pinglu treated died this way, surviving only four months before ending his own life. Even with Zhang Pinglu present, using sedatives, restraints, and various other methods failed to contain the frenzy.

While conditions like epilepsy shared superficial similarities, their harm was less than one ten-thousandth of this poison’s effect. This toxin ensured one’s consciousness remained clear while simultaneously stripping away all self-control.

It was precisely because of this unique, prolonged survivability paired with utter loss of agency that the Yin Blossom poison was ranked in the top ten. However, based on Zhang Yang’s analysis, the Yin Blossom poison amplified an existing desire, driving the victim to act upon things they had only ever thought about but never done.

Even the slightest prompt, a fleeting past notion, was magnified infinitely, ultimately compelling the victim to act. This poison seemed more akin to a toxin targeting the nervous system.

Regardless, it was an extremely complex and potent poison, which explained its placement at the tenth position among the Ten Great Poisons. After driving for a while longer, they arrived at another service area ahead.

Without notifying Long Feng, Zhang Yang steered the car directly into the service area and parked on the side. He took out his needle case from the canvas bag, selected a very fine silver needle, and inserted it directly into Mi Xue’s Yintang acupoint.

Soon, a faint grey hue appeared around Mi Xue’s Yintang acupoint, and the silver needle slowly began turning black. Seeing this, Zhang Yang discarded all remaining hope; he was now essentially certain that Mi Xue was afflicted by the Yin Blossom poison.

While worried, a faint aura of killing intent emanated from Zhang Yang. Since the Yin Blossom grew in the Southern Borderlands, it should not appear in Changjing, much less a century-old specimen.

Mi Xue being poisoned meant this was deliberate. No matter who was responsible, or how powerful their backing, Zhang Yang vowed to track them down and would not let them go.

Zhang Yang was the Zhang family's inescapable reverse scale, and Mi Xue was his. Anyone who dared to administer such a vicious poison would meet the most brutal end at his hands.

This was the first time Zhang Yang had felt such intense hatred toward an individual. Based on Mi Xue’s presentation, the poisoning occurred just before they departed, likely during those days they spent madly shopping.

Zhang Yang had not been with Mi Xue every moment during that procurement period; they had separated briefly. It must have been during that time that someone poisoned her.

This realization brought Zhang Yang a wave of regret; if he hadn't separated from Mi Xue, the poisoner would never have succeeded. Even a colorless and odorless poison couldn't be administered successfully right under his nose.

"Wuying!" Zhang Yang suddenly called out softly. Wuying, who had been lying down behind them, immediately straightened up and looked at Zhang Yang.

The three little ones were quiet now, sensing Zhang Yang's inner fury, though with their limited intellect, they did not grasp the specific cause. They could only guess it was related to Mi Xue.

"Bite Mi Xue once, be careful!" Zhang Yang instructed gently. Wuying’s saliva could neutralize a hundred poisons, unafraid even of the Golden Crown Python’s venom.

He wondered if it would be effective against the Yin Blossom poison. If Mi Xue were an ordinary person, Zhang Yang would not dare do this, but thankfully, Mi Xue had cultivated inner force and possessed Mid-Stage strength.

As long as Wuying was careful, Mi Xue should be able to endure it. "Chirp chirp?" Wuying hopped over, letting out a questioning chirp, its eyes showing confusion.

Zhang Yang mentally conveyed his plan to Wuying again. The little creature then understood Zhang Yang’s intention and realized Mi Xue was poisoned.

"Chirp chirp!" Wuying chirped again, this time tinged with anger. It swiftly hopped to Mi Xue’s feet and lightly sank its teeth into her calf for just a moment.

The sleeping Mi Xue merely felt a wave of coolness wash over her body, letting out a soft, comfortable moan before turning over and sinking back into sleep. Zhang Yang watched intently, a knot of tension tight in his chest.

The Ten Great Poisonous Beasts and the Ten Great Poisons differed significantly. Zhang Yang was unsure if Wuying’s remedy would work on the Yin Blossom poison.

His only hope now was for Wuying to succeed again; otherwise, curing Mi Xue would become immensely more complicated.