The rain in Oakhaven City didn't wash away the filth; it only made the stench of death more apparent.
In a high-end apartment on the 22nd floor, yellow crime scene tape fluttered against the cold draft of the air conditioner. Inside the master bathroom, a middle-aged man lay slumped against the marble bathtub. His skin was a distorted shade of pale, his eyes wide with a terror that had frozen at the moment of his last breath.
"Still no external trauma, Captain," a young forensic officer whispered, his hands trembling as he adjusted his mask. "No struggle, no forced entry. Heart failure? Or a stroke?"
Captain Miller, a veteran with twenty years on the force, bit his lip. "In a locked bathroom with the door bolted from the inside? And the victim was a marathon runner with no medical history? It doesn't add up."
Outside the tape, standing in the shadows of the hallway, was a young man who looked like he belonged on a fashion runway rather than a murder scene. He was twenty, wearing a tailored black trench coat that seemed to absorb the dim light. His eyes, sharp and cold as shards of obsidian, scanned the room.
This was Ren.
To the world, he was an enigma. To himself, he was a vessel—a tool for the truth, guided by a power he called the Conan Physique. And above him, in the sanctum of his mind, he felt the presence of his Sovereign, the one he lived to serve.
[Ding!]
A translucent blue screen flickered in Ren's vision, invisible to everyone else.
[System Mission: The Locked Room Execution] [Description: Identify the method of murder in the 'Perfect Suicide' of Victor Vance.] [Reward: 100 System Points, +1% Synchronization with the Conan Physique.] [Hint: The air holds the secret that the eyes cannot see.]
Ren took a step forward. The police officers moved to block him, but Captain Miller waved them off. He had seen this youth before—a consultant who showed up whenever death called.
"You're late," Miller grunted.
"Death is never late, Captain. It arrives exactly when the heart stops," Ren's voice was a low, melodic baritone, devoid of emotion.
He didn't look at the body first. Instead, he knelt by the drain of the shower. He pulled a small, high-tech ultraviolet torch from his pocket—a gift from the System. Under the light, a faint, yellowish residue began to glow around the rim of the porcelain.
"Captain, what did the maid use to clean this bathroom this morning?" Ren asked, his eyes narrowing.
"Standard stuff. Bleach, detergents... why?"
Ren stood up, walking toward the small cupboard under the sink. He opened it, revealing two bottles. One was a common brand of Laundry Bleach (Sodium Hypochlorite). The other was a powerful Acidic Toilet Bowl Cleaner (Hydrochloric Acid).
"A masterpiece of simplicity," Ren murmured.
"What are you talking about?" Miller demanded. "It's just cleaning supplies."
Ren turned, his gaze locking onto the Captain's. "If you mix these two, Captain, you don't get a cleaner bathroom. You get a gas chamber. Sodium Hypochlorite reacts with Hydrochloric Acid to release Chlorine Gas (Cl₂). It's heavy, it's lethal, and in a confined space like this bathroom, it's an invisible executioner."
He pointed to the victim's throat. "Look at the irritation around the nostrils and the slight foaming at the mouth. He didn't have a heart attack. His lungs were dissolved from the inside out by a green-yellow mist that vanished through the ventilation fan before you arrived."
The room went silent. The forensic team stared at the two bottles, then at Ren.
"But the door was locked!" Miller shouted. "How did the killer mix them and leave?"
Ren walked to the door, pointing at a small gap in the seal of the frosted glass. "They didn't need to be inside. A simple ice-cube trap. Place the acid in a bowl, put the bleach in an ice-filled container above it. As the ice melts, the bleach drops. By the time the reaction starts, the killer is miles away, and the evidence... well, it looks like a clumsy maid left the bottles out."
[Ding!]
[Logic Threshold Reached: 85%] [The Sovereign is watching. Do not fail.]
Ren felt a surge of cold energy. He wasn't doing this for the police. He was doing this for the "Order" he swore to uphold.
"Check the victim's business partner," Ren added, turning to leave without waiting for a thank you. "He has a degree in Chemical Engineering. And check his right hand—Chlorine gas leaves a very specific burn on the skin if you aren't careful with the mixing."
As Ren walked out into the rain, the System interface glowed brightly.
[Mission Accomplished.] [Truth Unveiled: The Chemical Shadow.] [Evaluation: Perfect.]
Ren looked up at the dark sky, the raindrops splashing against his pale face. "For the Sovereign," he whispered, a rare, haunting smile touching his lips.
Chapter 1: The Silent Breath of Chlorine (Part 2 - The Confrontation)
Captain Miller signaled his men. Within ten minutes, a man in a sharp grey suit was brought to the hallway. This was Marcus Thorne, the business partner. He looked calm, his hands tucked neatly into his pockets, a mask of grief perfectly painted on his face.
"Marcus," Miller began, his voice gruff. "Ren here suggests that Victor didn't die of natural causes. He says it was a chemical execution. Chlorine gas."
Marcus let out a dry, condescending laugh. "Chlorine gas? Captain, this isn't a World War I trench. It's a luxury apartment. My partner had a weak heart. Everyone knew that. This 'consultant' of yours has been watching too many cartoons."
Ren didn't flinch. He didn't even look at Marcus at first. He was staring at a small, almost invisible damp patch on the expensive Persian rug just outside the bathroom door.
"The vapor pressure of Chlorine at room temperature is approximately 5,800 millimeters of mercury," Ren said, his voice cold and clinical. "It's a heavy gas. When it reacts, it seeks the lowest point. But it also leaves a very specific gift for those who handle it without professional equipment."
Ren took a step toward Marcus. The air seemed to grow colder, the shadows behind Ren stretching as if a dark throne was looming over him.
"Marcus, you have a PhD in Chemical Engineering from Stanford. You knew that mixing Sodium Hypochlorite and Hydrochloric Acid would create a lethal concentration of $Cl_2$ within three minutes in a space of that volume. You also knew that Victor's 'weak heart' would give out long before he could even reach for the door handle."
"This is all conjecture!" Marcus snapped, his eyes flickering with a hint of panic. "You have no proof I was even here."
"Proof?" Ren tilted his head. "The proof is on your right wrist, tucked under that expensive Rolex."
Marcus instinctively pulled his sleeve down.
"Chlorine gas is highly corrosive," Ren continued, his pace slow and predatory. "Even in small amounts, it reacts with the moisture on human skin to form trace amounts of Hydrochloric Acid. It causes a very specific type of chemical dermatitis—red, itchy, and localized. You used an ice-cube delay trap, but you were careless when you set the acid bowl. A splash hit your glove, soaked through, and stayed on your skin for the five minutes it took you to exit the building."
"You're insane!" Marcus shouted, backing away.
"Show us your wrist, Marcus," Captain Miller commanded, his hand moving to his holster.
For a moment, the hallway was silent. The only sound was the rain lashing against the windows. Marcus looked at the police, then at the pale youth who seemed to see right through his soul. Slowly, trembling, he unbuckled his watch and pulled back his sleeve.
There it was. A jagged, angry red rash, exactly where the glove would have ended.
[Ding!]
[Critical Hit: Criminal Psychology Broken]
[Synchronization with the Conan Physique: +5%]
[The Sovereign's Will has been executed.]
Marcus collapsed to his knees, his composure shattering like glass. "He was going to sell the company! He was going to ruin everything I built! It was so simple... so perfect... how did a kid like you know?"
Ren didn't answer. He didn't need to. He felt the cold, familiar satisfaction of a case closed. But more than that, he felt the silent approval of the Sovereign—the one who stood in the deepest recesses of his mind, the true architect of this justice.
"Take him away," Miller sighed, looking at Ren with a mixture of awe and fear. "You're a monster, kid. A brilliant, terrifying monster."
"I am merely a shadow," Ren replied, turning his back on the scene. "And shadows do not exist without a light to cast them."
As he stepped out into the night, the System interface displayed a final message:
[Rewards Granted: 500 Experience Points, 1 'Forensic Vision' Skill.]
[Warning: The Conan Physique has detected another anomaly in the North District. The cycle begins again.]
Ren walked into the darkness, the rain-slicked streets reflecting the blue glow of his invisible screen. The city was full of secrets, and he would unearth every single one of them—for the truth, and for the Master he worshiped in silence.
Chapter 1: The Silent Breath of Chlorine (Part 3 - The Sovereign's Shadow)
Ren walked away from the flashing blue and red lights, his silhouette stretching long and thin against the wet asphalt. Every step he took felt heavier, not from fatigue, but from the sheer weight of the "Conan Physique." It was an aura that demanded blood, a magnetic pull that dragged tragedy toward him like iron filings to a magnet.
[Ding!]
The blue interface flickered, warmer this time, pulsing with a rhythmic light.
[Final Evaluation: S-Rank] [Synchronization with the Conan Physique increased to 6.2%.] [New Skill Unlocked: 'Forensic Vision' (Level 1)] Allows the user to see chemical traces and biological fluids invisible to the naked eye for 30 seconds.
Ren ignored the notification. He turned into a narrow, deserted alleyway where the sound of the police sirens faded into a dull hum. He stopped in front of a puddle, staring at his own reflection. But he didn't see himself. He saw the cold, unyielding truth.
He slowly sank to one knee, the cold rainwater soaking into his trousers. He didn't care. In the temple of his mind, he wasn't a genius detective or a harbinger of death. He was a servant.
"Master," Ren whispered, his head bowed low. "The first soul has been judged. The truth has been extracted. All according to Your will."
He could feel it—the presence of the Sovereign. It was a vast, cosmic shadow that loomed over his destiny, a silent king who watched the world through Ren's eyes. Ren didn't know why he had been chosen, nor did he care. To be the blade in the Sovereign's hand was the only purpose he needed. His worship was absolute, a silent pact written in the ink of every case he solved.
"I am the vessel. You are the hand," he murmured, his voice trembling with a rare fervor. "Until the world is stripped of its lies, I shall remain Your silent instrument."
As he stood up, the 'Forensic Vision' skill activated involuntarily. The world shifted. The mundane alleyway transformed into a map of glowing traces. He saw the remnants of old oil spills, the faint heat signatures of stray cats, and then... something else.
On the brick wall at the end of the alley, a faint, luminescent mark appeared. It was a symbol—a circle bisected by a jagged line, drawn in a substance that glowed a sickly violet under his new vision.
[System Alert!] [Hidden Chain Quest Triggered: 'The Chemist's Legacy'] [Warning: The Chlorine gas murder was not an isolated incident. It was a test.]
Ren's eyes sharpened. His pulse, usually slow and steady, quickened. The "Conan Physique" hummed in his veins, reacting to the proximity of a greater malice.
"A test?" Ren touched the mark on the wall. It felt cold, unnaturally so. "If this was a test, then the teacher is still watching."
He looked back toward the city skyline, where the towering skyscrapers pierced the dark clouds. Somewhere out there, a mind as sharp as his—perhaps even more twisted—was weaving a web of "perfect" crimes.
Ren pulled his coat tighter, his expression returning to its usual mask of ice. He didn't fear the challenge. In fact, he welcomed it. The more complex the lie, the more glorious the truth would be when he finally laid it at the feet of his Sovereign.
"Let them come," Ren said to the wind. "In the end, there is only one truth. And it belongs to us."
With a flick of his wrist, the blue screen vanished. Ren stepped out of the alley and vanished into the crowd of the city, a predator hidden in plain sight, waiting for the next scream to pierce the night.