Zenitsu & Papyrus vs Spider Brother – Dark Version
The clearing smells like rot.
The air vibrates with the sound of tiny legs crawling.
Zenitsu clings to Papyrus' leg like he's about to die.
"SPIDERS… SPIDERS EVERYWHERE… I'M GONNA PASS OUT!!"
Papyrus dramatically places his hands on his hips.
"ZENITSU! A HERO DOES NOT FEAR TINY BUGS! EVEN IF THEY HAVE FAR TOO MANY EYES!"
The Spider Brother steps forward.
Unnaturally thin.
Blank eyes.
Pale skin stretched tight.
Hundreds of spiders drip from his arms like living sleeves.
He grins, wide and wrong.
"You two… will make lovely puppets."
He flicks a finger.
The spiders rush forward in a flood, legs clicking like teeth chattering.
Zenitsu screams so loud the trees shake.
"I HATE THIS MOUNTAIN!!"
Papyrus summons bone pillars that slam into the ground, forming a barricade.
"NO SPIDER SHALL PASS!"
But the spiders crawl through cracks, over walls, under bones…
Spider Brother giggles.
"You can't stop all of them."
Papyrus frowns.
"OH NO. HE IS RIGHT. THAT IS TOO MANY SPIDERS!"
Zenitsu curls into a ball, trembling.
Papyrus leans down and shouts:
"ZENITSU! IF YOU DO NOT WAKE UP AND FIGHT, I SHALL BECOME SPIDER FOOD!"
Zenitsu freezes.
His fear spikes past its limit.
He faints.
Papyrus sighs.
"…THIS AGAIN!?"
Zenitsu's head drops…
Thunder flickers.
His breathing changes.
His eyes close, calm.
Papyrus gasps.
"HE HAS ENTERED HIS SUPER FORM!"
A single spark dances across Zenitsu's blade.
Spider Brother's grin twists into anger.
"Don't you dare—!!"
Zenitsu moves.
A streak of lightning cuts through the dark.
Papyrus shields his face.
"OH WOW THAT IS VERY BRIGHT—!"
A thunderclap hits.
KRACK
Spider Brother collapses, arm severed.
Zenitsu stands in his fainted trance, sword humming.
Papyrus strikes a pose beside his fallen attacker.
"YES! WELL DONE, ZENITSU! EVEN THOUGH YOU ARE NOT AWAKE!"
The fight continues as spiders swarm again.
---
Sans & Tanjiro vs Spider Mother – Dark Version
The puppeted Demon Slayers rush at them, limbs twitching unnaturally.
Tanjiro blocks the first attack gently.
"They're suffering… we need to free them without killing them!"
Sans nods, eye glowing cyan.
"on it."
He flicks his wrist.
Invisible gravity pulses snap every thread controlling the Slayers.
Their bodies collapse, unconscious but breathing.
Spider Mother watches, trembling.
Her hands shake.
Her face is calm… but her eyes scream with fear.
She whispers:
"If I fail… he'll rip me apart."
Tanjiro's grip tightens on his sword.
"He? Someone is forcing you?"
Sans tilts his head.
"someone strong's pulling her strings too…"
Suddenly, the forest temperature drops.
Cold, suffocating pressure fills the air.
Spider Mother flinches violently, covering her head.
"HE'S WATCHING—RUN, PLEASE—RUN BEFORE HE COMES!"
Her fear isn't of death.
It's of someone worse.
Tanjiro steps closer, tears building in his eyes.
"You don't want to fight.
I can smell your pain… your terror."
Spider Mother lowers her arms and closes her eyes.
"Please… end it quickly."
Sans floats beside Tanjiro.
"kid. she's asking for mercy."
Tanjiro lifts his blade.
"Water Breathing… Fifth Form… Blessed Rain After the Drought."
One soft strike.
Spider Mother's head falls peacefully.
Her body relaxes for the first time in years.
Her last whispered word:
"Thank… you…"
Sans watches her fade, expression serious for once.
"…no one deserved that."
The forest shakes violently.
The presence deeper inside the mountain flares—
Angry.
Cold.
Childlike…
but monstrous.
Sans turns.
"welp. looks like big brother's pissed."
---
Inosuke vs Spider Father – Dark Version
The ground trembles.
A towering monster emerges—
huge torso, arms like tree trunks, face contorted in a permanent scream.
Spider Father roars, shaking the forest.
Inosuke screams back louder.
"YES!! FINALLY A DEMON WORTH BUTCHERING!!"
He lunges.
The giant swats him like a fly.
CRASH.
Inosuke's body smashes into three trees.
He stands up instantly, laughing.
"THAT WAS AWESOME!"
He charges again, blades clashing against Spider Father's claws.
Blood sprays.
Branches fall.
Trees are ripped apart.
Inosuke fights like a beast unchained—
but Spider Father is getting angrier, growing larger, skin bubbling with transformation.
---
The Mountain Awakens
Three battles.
Three struggles.
But the forest grows darker still.
A cold voice echoes through the trees:
"Why are you all… ruining my family?"
Sans freezes.
That voice…
Tanjiro grips his sword.
"I feel it. He's stronger than all of them."
Papyrus shivers despite having no skin.
"THIS DOES NOT FEEL LIKE A NORMAL BOSS BATTLE!"
Zenitsu (still fainted) twitches as lightning flickers.
Inosuke screams at the top of his lungs.
"BRING ME STRONGER DEMONS!!"
A pale figure with red eyes steps onto a web bridge high above them.
A boy.
Small.
But wrong.
So wrong.
Rui.
The Lower Moon.
The real nightmare of Mount Natagumo has arrived.
To be continued…