The salty seawater flooded **Darius Flint's** lungs, sending a dull pulse of pain through his temples.
Cold moonlight filtered through the waves, glinting off the serrated metal blade extending from his right arm. The **Saw-Tooth Revolving Blade** gleamed like a predatory fin beneath the surface. Thin metallic patterns crawled from his wrist to his elbow—evidence of the power he had gained after integrating the **Saw-Tooth Fruit**.
A system alert echoed faintly in his mind.
Darius ignored it for the moment.
With one arm wrapped around **Nami's wrist**, he swam hard toward the reef zone ahead. Arlong's patrol boats would seal the main channel before sunrise. If they didn't slip past **Iron Hook Pete's stronghold** within three hours, the retreating tide would trap them in the shallows.
"Does it hurt?" he asked, glancing sideways.
Nami floated beside him, her blue hair spreading through the water like strands of drifting silk. The faint golden markings on her left arm—the remnants of her broken contract—flickered gently with each breath she took.
She clutched a half-rolled sea chart tightly to her chest, protecting it instinctively even as the parchment edges softened from the seawater.
Nami shook her head.
Moonlight refracted through droplets clinging to her eyelashes.
In her other hand she held a faintly glowing fish scale Martha had given her. The pale green light shimmered softly between her fingers.
"The current in the reef area is strong," she said quietly, bubbles escaping with each word. "Iron Hook Pete has chains with hooks hidden in the channels. They're wedged into the coral. Last time I…"
Her voice faltered.
Her fingers tightened around the scale.
Darius felt the tremor in her wrist.
Three days earlier in **Cocoyasi Village**, he had watched this same girl sprint through a storm, clutching a weather gauge while laughing at the wind.
Now the spark in those eyes was dimmed by something darker.
Eight years under Arlong's shadow had left scars no one could see.
The water around them grew colder as they approached the reef zone. The current tugged harder, twisting the seaweed below them like grasping fingers.
Danger was close.
A blue light flickered across Darius's vision.
**[System Sprite: Guo Guo Activated]**
**[Scanning…]**
**[300 meters ahead: Three patrol boats detected.]**
**[Anchor chains composed of Sea Stone.]**
**[Recommendation: Cut anchor chains using Saw-Tooth Fruit ability.]**
**[Outgoing tide vortex can conceal escape route.]**
Darius narrowed his eyes.
Sea Stone suppressed Devil Fruit powers—but his blade wasn't a normal ability. It was a **metallic integration**, partially immune.
The system had estimated a **30% resistance**.
"Hold on," he said.
His metallic hand slid around Nami's waist, steady but firm. Beneath the soaked fabric he could feel the ridges of her spine as they dove deeper into the dark water.
They moved like a silver streak beneath the waves.
Darius released his **Observation Haki**, letting it expand outward like an invisible net.
Every movement within three hundred meters appeared in his mind as glowing points of light.
Two fish-men patrolled behind the reef with harpoons.
On the stern deck of the nearest boat, a human pirate lazily cleaned a rifle.
Below the hull, the anchor chains descended into the depths—each link glowing faint green.
Sea Stone.
Darius's blade extended three inches.
"Now."
The serrated edge struck the chain.
Underwater sparks burst outward like shattered fireworks.
A dull shock raced up his arm.
The metallic skin covering his forearm cracked slightly, peeling under the pressure—but the blade pushed through the resistance.
The system had been right.
Golden rays seeped through the metal patterns, coating the blade in a thin armor-piercing glow.
**SNAP.**
The anchor chain split apart.
Above them the patrol boat lurched violently.
Shouting erupted on deck.
Harpoons plunged into the water from the left.
Darius grabbed Nami and dragged her deeper just as the **second chain snapped**.
The tide vortex surged to life.
Murky currents twisted the water into spirals filled with sand, seaweed, and broken shells, swallowing their silhouettes.
"Nami!" Darius shouted.
"The chart!"
The parchment was tearing in the current.
Fragments of soaked paper spun toward the vortex center.
Darius released her wrist instantly, wrapping his arm around her waist while spinning the Saw-Tooth Blade outward.
Metal ripples spread through the water, deflecting debris in a protective ring.
Nami pressed the glowing fish scale against the damaged chart.
Pale green light spread across the parchment, revealing the reef layout once more.
"If the current flows this way…" she murmured. "We might avoid the traps."
Darius nodded.
Ahead, his Observation Haki suddenly detected **dozens of signals** clustered together.
Iron Hook Pete's stronghold.
A fortress of wrecked merchant ships and tangled fishing nets anchored between the reefs.
Hooks and chains filled the surrounding water like a steel forest.
The system voice spoke again.
**[Warning: Iron Hook Pete detected.]**
**[Threat Level: B-Class.]**
**[Target specializes in hook-chain combat.]**
**[Historical record: Pierced Marine Captain's thigh during previous engagement.]**
Darius rubbed his thumb along the serrated blade.
He remembered the night he fused the Devil Fruits in the laboratory—the moment metal powder reacted with saw-tooth fragments inside a petri dish.
The same light now shimmered across his blade.
A tool meant to break deadlocks.
"Stay close," he said, giving Nami a crooked smile.
"After this… I'll buy you tangerines."
Nami blinked.
Then she nodded firmly, gripping the chart tighter.
They approached the fortress.
Moonlight cast long shadows across the skeletal mast of a wrecked merchant ship.
From the highest spar, a figure slowly rose.
A leather eyepatch covered one eye.
The iron hook in his hand glowed faint blue.
Poison.
"I see prey…" the man rasped.
**Iron Hook Pete.**
The seawater rippled suddenly.
Darius's Observation Haki flared with warning.
Something slid down from the mast above.
Too fast.
Pete dropped from twenty meters like a hunting owl.
The hook chain snapped around Darius's ankle.
Barbs pierced his metallic skin.
Darius gritted his teeth.
A red warning exploded across his vision.
**[ALERT]**
**[Neurotoxin detected.]**
**[Metallic integration 41% — resistance time: 30 seconds.]**
His Observation Haki surged.
He saw everything.
Pete's descent angle.
The tension in the chain.
And Nami—retreating toward the reef, her foot bleeding from coral but refusing to stop.
"NAMI!"
His voice roared through the water.
"Thirty meters northeast! Abandoned fishing boat!"
His blade extended to half a meter.
Golden energy flooded its edge.
Pete tightened the chain.
Darius twisted with the force, slamming his foot into the rotting deck beneath them.
**CRACK.**
The wood exploded into splinters.
Pete staggered.
Darius felt the toxin spreading through his leg.
Metal peeled away from his skin, revealing the faint golden fusion layer beneath.
The system activated automatically.
**[Devil Fruit Fusion Defense Activated]**
Sand particles from the **Suna Suna no Mi** fused with the metallic structure, forming a temporary alloy shield.
But the chain remained intact.
Sea Stone burned against his skin.
Darius's jaw tightened.
"System… fusion coefficient!"
**[Fusion Body Resistance increased to 45%.]**
**[Recommended Skill: Penetrating Shot.]**
A reddish-gold sphere condensed at the tip of his blade.
Darius flicked his wrist.
The energy projectile blasted into the chain connection.
**CLANG.**
The iron hook dropped.
Pete's eyes widened.
He instantly pulled a second grappling hook from his waist.
Sea Stone threads wrapped around the weapon.
Arlong's order echoed in his memory.
*Capture the boy alive.*
A signal flare suddenly exploded in the distance.
Red firelight illuminated Pete's scarred face.
Darius's Haki detected the patrol boats approaching fast.
He glanced toward the fishing boat.
Nami peeked through a porthole and gave him a quick signal.
Safe.
Darius wiped seawater from his face.
"It's time to finish this."
Pete swung the grappling hook toward a mast and launched himself forward.
The weapon arced toward Darius's throat.
Darius raised his metallic arm to block—
**CLANG.**
Something felt wrong.
The weight.
The energy.
The grappling hook tore through half the mast behind him, sending splinters flying.
Darius spun aside.
A faint green glow flickered along the hook's edge.
The system shrieked.
**[Unknown energy detected!]**
Pete's eyepatch slipped slightly.
His exposed eye gleamed like a wolf's.
"Try the **Devil Poison** Arlong got from Impel Down."
A burning pain erupted across Darius's arm.
The fusion layer began melting.
Even the system defense struggled to resist it.
Above them, Pete raised the glowing hook again.
The weapon slowly aimed at Darius's heart.
And the sea fell silent before the next strike.
---