Bianca leans in the doorway, watching the melee. She mutters, "Like great. This must be like some like last line of defense or something."
She looks over at Charlie.
He is still pacing, chin in hand, deaf to the clamor of the fight. The muttering hasn't stopped.
"Sound is the breath of life and cannot be put to death by steel... Of course! Elementary natural philosophy, really! Vibrational resonance possesses no corporeal flesh to cut, no biological cellular matrix to bleed out! The universal monochord is pure, untouched spirit until it strikes the dense, heavy mire of the lower material world!"
Charlie halts. He glances up. Then his head drops and the pacing resumes.
"'Therefore we forged the Vitriol-Pyrobloin Core... bound the demon of the false dawn to the Seven Planetary Spheres, anchoring its acoustic soul within the Living Crystal of the Sea.'"
He stops.
"Living crystal... the Fixed Salt! The ancient engineers didn't kill the Great Discord because an acoustic entity cannot be executed; it can only undergo fixation! They bound the volatile, screaming vapor into a static, solid state using volcanic glass and the sea's unyielding marrow! But look at the conditional clause—look at the grammar!"
His stride quickens.
"'To break the crystal is to sever its leash; it will no longer return to stone, but walk the waking earth forever.'"
He whirls.
"A tether! It's a reciprocal dampening anchor! If the battle on the surface concludes without breaking the crystal down here, nothing changes! The entity will merely recoil down the metaphysical line, slip back into the stone, sleep off its defeat, and wait another few centuries for another singing fool to wake it up! But if we smash the crystal prematurely, the leash snaps, the containment matrix collapses, and it becomes an autonomous, unkillable rough demon! A perpetual, roving cataclysm tearing across the sea!"
He stops dead.
"So how does one banish a metaphysical frequency that the living sea cannot drown?!"
He turns back to the inscription.
"'Only the Sovereign of the Threshold—the one who bears the Salt of the Underworld and rings the Nine Bells of the Void—can open the Gate. Drive the beast beyond the River of Forgetfulness. Oblivion shall swallow what the living sea cannot drown.'"
His eyes widen.
"The Salt of the Underworld... the primordial gloom! Hawkeye's daughter! Marya! Her mist isn't ordinary vapor; it's the universal solvent—the corrosive aether that strips the volatile soul right off the fixed body! And the Nine Bells! The Nine Ancient Governors of the outer celestial circles! The Gate to the River of Forgetfulness! They don't mean an oceanic trench; they mean the River of Oblivion in the Underworld! You cannot murder an ancient song with an ordinary blade, but if its tether to this island is cut, it can be driven beyond that gate into exile!"
His eyes drop to the final line.
"'WARNING: The fracture of the Anchor requires the Voice of the World's Worst Warship. When the stone shatters, the seas shall weep.'"
He freezes.
"Voice? The Voice of the World's Worst Warship?! The Ancient Weapon Pluton! The ancient records never meant ordinary artillery; it was built to erase islands through sympathetic vibration! Pure infrasound matched to the bedrock! But what frequency?! What possible acoustic key could crack a Vitriol-Pyrobloin lattice without tearing the entire sea trench apart?!"
His pacing breaks into a near-trot.
"Seven concentric spheres... forty-two outer sacred radicals... wait... wait! The universal celestial scale begins at the divine pitch of four-hundred and thirty-two hertz! The Living Crystal of the Sea sits at the lowest physical octave—drop it by one perfect, natural half! Four-hundred and thirty-two divided by two is two-hundred and sixteen! And the seventy-two hidden names of the wind and sky—seventy-two taken in three sacred parts—is two-hundred and sixteen! But the crystal was grown to absorb perfect intervals; a clean tone would just be swallowed by the electrum dampening tracks! It needs... it needs the fatal flaw! The wolf interval! The minute mathematical comma of twenty-three point four-six cents sharp!"
He slaps his forehead.
"Ahem! Yes... yes! The entire tripartite harmonic circuit!"
Smack!
"AH HA!"
He pirouettes, arms flung wide.
"Charlie triumphs again!"
He levels a finger at the Poneglyph.
"I have deduced the entire architectural and metaphysical sequence! Listen to the brilliant coherence of this ancient paradigm!"
He resumes his circuit, his voice climbing with every sentence.
"The Poneglyph is not a warning; it is a double-blind procedural manual left behind by the Great Kingdom!"
He holds up one finger.
"First! The crystal sitting beneath Elegia is an alchemical anchor—a crucible! That rough demon is currently tethered to it like a beast on a chain! As long as that crystal stands, it will never truly leave! Even if our friends on the surface manage to beat it down, the entity will merely snap back down the cord, re-condense inside this crystal tomb, and wait centuries for another summoner!"
He holds up two fingers.
"Second! In order to make exile even possible, we must deliberately sever that tether by shattering the crystal anchor! But no pickaxe, bomb, or conventional artillery can pierce vitrified Sea-Stone and Pyrobloin! It requires the acoustic cannons of the Ancient Weapon Pluton! The crew on the bridge must calibrate the dreadnought's transducers not to an explosive blast, but to an acoustic-cavitation beam tuned precisely to two-hundred and sixteen hertz, offset by that twenty-three point four-six cent mathematical comma, riding upon a seven-point-two hertz tectonic carrier wave! That specific discrepancy will force the internal crystal matrix to reject its own harmonic tension and dissolve into harmless dust!"
He holds up three fingers.
"Third—and this is the terrifying crux of the whole operation! The moment Pluton shatters that crystal, the rough demon is completely unchained! Its anchor dissolves! It becomes an autonomous nightmare walking the waking earth, no longer bound to a host, no longer tethered to this island's stone!"
He holds up four fingers.
"Which brings us to the final step! Marya Zaleska is the 'Sovereign of the Threshold'! Her awakened mist and that greatsword of hers are the only instruments in existence capable of ringing the Nine Bells of the Void and opening the Gate! Once the crystal is dust and the leash is gone, the rough demon has no anchor left in this world—leaving Marya and Luffy the exact opening they need to sever its presence here and drive it beyond the River of Forgetfulness forever!"
He spreads his hands.
"We break the cage with Pluton, cut the cord, and clear the path for the final exile!"
He beams.
"It is absolute, peerless, symphonic genius!"
---
Bianca rolls her eyes. "Like cool. So like the Pluton can like send the like signal or whatever, then like Marya and Luffy can like send it wherever."
Charlie draws a breath to reply—
A crash booms down the passage. A gray tongue of smoke curls in through the doorway.
Charlie asks, "Did something happen?"
Bianca nods as she reaches into her pocket. "Like yeah, but like don't worry about it or whatever. We have to like call the Pluton."
---
On the bridge of the Pluton, Law's voice comes through the speakers. "Hakugen, bring the minisub to the dock. Uni, prep medical."
Click.
Uni and Hakugen dash for the hatch.
Jean Bart presses a button. "Ikkaku."
Ikkaku's reply comes back sharp. "What?"
Jean Bart says, "We need you on the bridge!"
Ikkaku replies, "I'm almost finished my calibration. Be right there! OUT!"
Clione glances at his console. "Incoming call!"
Jean Bart nods. "Put it through."
Bianca's voice pops through the speaker. "Like yo. It's like me again!"
Charlie's voice cuts in. "Ahem!"
Bianca talks over him. "Like chill. I got—"
Charlie interrupts. "The ceiling is not waiting on your pleasantries!"
BOOM!
Jean Bart asks, "Everything okay?"
Bianca huffs. "Like fine. Like go ahead."
Jean Bart and Clione flinch as static scrapes through the speaker. Then Charlie comes on the line.
"Ahem! Do you copy?"
Clione replies, "Yes! What do you need?"
Charlie barrels on. "Ahem! I will keep this short!"
Clione mutters, "That'll be a first."
Jean Bart snorts.
Charlie continues. "Ahem! Cease whatever melancholy calculations you are engaged in and tune your acoustic transducers immediately, because I have unlocked the entire mechanical cipher of the Great Kingdom! Do not fire an explosive concussion—the sea-stone bedrock will merely swallow the kinetic shock! You must align the vessel's crescent prow along the subterranean fault line beneath Elegia's western trench and discharge a surgical acoustic-cavitation pulse calibrated to exactly two-hundred and sixteen hertz, offset by an intentional microtonal discrepancy of twenty-three point four-six cents sharp, riding atop a seven-point-two hertz tectonic carrier wave! That deliberate mathematical discord will force the vitrified crystal matrix to reject its own harmonic tension and shatter the leash from below, severing the rough demon's anchor to this island and giving Marya the chance to open the Gate of the underworld—now calibrate your Mother Flame reactor and fire before this entire cavern collapses onto my pith helmet!"
Clione bites back a laugh. "Sure."
He taps a sequence into the console. "Melinoë, did you get all that?"
Melinoë fades into view. A sigh.
"Must you shout, Charlie? The transceiver already rattles like a dying lung, and your enthusiasm for cosmic tragedy is frankly exhausting."
A second, longer sigh.
"So, to summarize our impending catastrophe: you want the Pluton to fire an acoustic shockwave from its prow straight into the trench at two-hundred and sixteen hertz, intentionally de-tuned by twenty-three cents to crack an ancient rock. How marvelous. Leave it to mortals to turn a warship's cannon into an out-of-tune instrument just to break an eight-hundred-year-old padlock."
She pauses.
"I have calibrated the resonance array to the seven-point-two hertz tectonic pulse. When the Mother Flame discharges, the crystal will shatter, the demon's leash will snap, and the entire seabed will cave in—likely dropping several tons of basalt right on your precious pith helmet."
Charlie tries to interrupt. "No! Wait for—"
Melinoë continues. "Mother Flame output locked. Transducers humming."
Her expression doesn't change.
"Firing now. Try to die quietly, Charlie; static gives me a headache."
Ikkaku's voice blares from the speaker. "What the hell was that? We just had a massive power spike!"
Melinoë replies, "Our impending doom. Now if you don't mind, I need a nap. This is more than enough existential dread for one day."
She winks out.
---
The transponder snail clicks off.
Bianca glares at Charlie. "Like you should have like let me talk to them and stuff now—"
A hum rises through the floor. Dust sifts down from the ceiling.
Charlie's throat bobs. His gaze creeps upward.
A fissure splits the face of the Poneglyph. Behind it, glowing fractures branch across the wall.
Charlie whimpers, "Bianca..."
Bianca scowls. "Like yeah. That like looks like a problem."
They both duck and shield their faces as the wall bursts apart, flinging shards and grit across the chamber. Green light floods the room, and the cracking deepens into a groan, as though the stone were remembering how to break.
Bianca looks at Charlie. "We should like run."
Charlie nods. They bolt for the door.
They round the corner—
Aurélie, Limejuice, Building Snake, and Yasopp stop short. Behind them, the giant centipede automaton collapses into a heap.
Yasopp calls out, "What is—"
Bianca snaps back, "Like run! Like right now! The like whole place is like going to like collapse!"
The four of them glance at one another—
Chunks of ceiling start to rain down.
They take off after Bianca and Charlie.
Building Snake calls out, "Did you forget that you blew up the entrance to the library?"
Bianca stiffens, then flashes a sheepish grin. "That like may be a problem."
Yasopp replies, "Ya think!"
---
They pound up the spiral stairs.
Charlie tries to stop, doubled over and wheezing.
Building Snake grabs him. "No time for that! Keep moving!"
Charlie replies, "Yeah, but—"
BOOM!
A ceiling beam crashes down.
They reach the library's rubble-choked entrance. The floor is giving way.
Limejuice groans. "Okay. This is bad."
Bianca's head swivels. Her gaze settles on a blank stretch of wall beside the door. She digs into her pocket and pulls out one of her explosives.
"Like clear."
Yasopp glances over and spots what's in her hand. "Dammit, kid! Really!"
Bianca hurls the bomb. It sticks to the wall.
BOOM!
The blast punches a ragged hole through the stone.
The smoke thins. The coughing tapers off.
Aurélie is already on her feet. "We need to move."
Yasopp replies, "Right behind you."
They scramble through the gap just as the library floor gives way and drops into the churning green glare below.
---
They burst out of the castle. The ground heaves under their feet. Behind them, the castle shudders and comes apart, sinking into the green glow pouring up from the shattering crystal.
The towers crack. The walls split. The great hall folds inward, its roof caving, its pillars shearing through one after another. The green light throbs in slow, sickly surges, and with each one the castle sinks lower, dragged into a widening pit until the earth closes over it.
They stop, chests heaving.
Aurélie straightens. "We should hurry to the minisub."
Yasopp doesn't argue. "Yeah! This whole place looks like it's about to go!"
Bianca nods. "Like cool, but like I gotta make a call!"
Building Snake waves her on. "Do it on the way!"
They run.