They collided in the center of the chamber like two opposing pressures that had been building since the moment Nathan stepped through the tunnel.

Nathan was faster. That much established itself immediately — each swing of Kyomei arrived before Yorimasa’s body had fully registered the intent behind it, the cursed blade cutting arcs through the candlelit dark with a low, resonant hum. Any one of them should have ended it. Against anyone else, any one of them would have.

But Yorimasa didn’t defend. He didn’t parry or block or throw himself clear. He simply wasn’t where the blade arrived — not through speed, not through reading the strike, but through something boneless and deeply wrong in the way he moved. He bent around Kyomei’s edge the way smoke bends around a hand that passes through it, his torso folding sideways past the flat of the blade, spine curving at angles that had no place in a human body, joints rotating through their range and then beyond it without resistance or sound. Where a person would have broken, Yorimasa simply continued moving, flowing into the next position with that same unhurried, liquid wrongness.

Nathan landed two steps back and reset his grip.

He’s not dodging. He’s redirecting. The distinction mattered. Dodging required anticipation, required the body to commit to a direction. What Yorimasa was doing was more like water choosing the path of least resistance — reactive rather than predictive, governed by something coiled and instinctual running just beneath the surface of him.

Yorimasa straightened from a contortion that should have snapped his spine in three places and smiled.

Then he opened his mouth — far wider than it should have opened — and a sound came out that was less voice and more resonance, a deep, subsonic vibration that moved through the stone floor and up through Nathan’s boots.

The chamber answered it.

The walls split first — long vertical cracks racing from floor to ceiling as something underneath the stone shifted and pushed. Then they came through. Massive triangular heads forcing through the gaps in the rock, scales black-green and gleaming in the candlelight, bodies as thick around as old tree trunks uncoiling from the spaces behind the walls as though they had always been there, waiting. Four of them. Then six. Eyes like cold amber catching the flame-light, forked tongues tasting the air.

The chamber became considerably smaller.

Nathan moved immediately, driving forward toward Yorimasa before the snakes could fully emerge — if he could end the man commanding them, the rest would follow. Kyomei came down in a heavy overhead strike aimed at splitting Yorimasa from crown to sternum.

Yorimasa slid sideways like oil across stone, and two of the serpents lunged simultaneously from opposite directions, their combined mass striking the space Nathan had occupied a fraction of a second before he cleared it with a sharp pivot. Stone cracked where the impact landed. One of the great heads swung back around immediately, jaw unhinging as it struck toward his flank — Nathan caught it across the snout with the flat of Kyomei’s blade and drove it into the ground, buying himself two seconds before another came from above, dropping from the ceiling where it had coiled silently around a beam.

He severed that one’s head cleanly mid-drop, the body crashing to the stone in a thrashing heap.

But as it fell, the neck sprayed — not blood. Something else. A fine, dark mist that dispersed through the air faster than it had any right to, catching the warm currents of the candle flames and spreading outward in a thin, invisible veil across the chamber.

Nathan caught the first breath of it before he could stop himself.

It hit the back of his throat like cold metal, acrid and deep, and his body registered it immediately — a wave of vertigo rolling up from the base of his skull, the edges of his vision blurring slightly, the familiar sharpness behind his eyes softening in a way he trusted about as much as a blade held at an unfamiliar angle. He clamped his forearm over his nose and mouth and drove his focus inward, forcing his body to push against it, but the mist was already inside him and it wasn’t waiting for permission.

The chamber tilted slightly. Just slightly. Enough to matter.

Yorimasa observed this from across the room with visible satisfaction, standing relaxed between two of his serpents, one hand resting on the nearest coil as though greeting an old companion.

"The venom disperses on contact with air," he said pleasantly. "You can hold your breath for quite some time, I imagine. But it’s already in your blood." He tilted his head, that too-wide mouth curving. "How are your legs feeling?"

They were feeling, Nathan noted with cold displeasure, slightly less reliable than they had been sixty seconds ago.

He exhaled once, hard, clearing his airway, and raised Kyomei with absolute steadiness despite the current running beneath his skin.

"Still good enough," he said.

He moved again — not directly toward Yorimasa this time but through the serpents surrounding him, Kyomei finding gaps between coiling bodies with precise, economical cuts rather than large sweeping strikes. Less range, less exposure to the dispersal mist the bodies produced when cut. He took one across the neck — turning his face away from the spray — drove another’s strike into the stone floor with a downward redirect, and came through the gap in the ring they’d formed with Yorimasa suddenly, immediately in front of him.

Yorimasa’s body began to fold away—

But Nathan had anticipated that this time. He didn’t follow the direction Yorimasa moved toward. He placed Kyomei where Yorimasa would arrive.

Yorimasa’s smile stretched wide — far too wide — as Nathan’s blade tore through empty air again, and something almost like delight moved through those amber eyes.

Nathan had stopped being surprised by it. The man simply had no geometry that made sense, no fixed architecture of bone and joint that a blade could predict and target. He moved like something that had learned to wear a human shape the way a traveler wears borrowed clothes — convincingly, but without any real commitment to the fit.

He didn’t let the thought slow him.

His darkness detonated outward from his core without warning — not Kyomei, not a swing, not anything Yorimasa could read in the set of his shoulders or the angle of his wrist. Just pure, concentrated force released in a single outward pulse that hit the Daimyo like a wall of black pressure.

BADOOOM!

The sound was less a sound and more a physical event. The candle flames died in an instant. The altar cracked down its center. And Yorimasa, for the first time, did not flow out of the way — he was simply struck, his body folding around the impact before being hurled backward into the stone wall hard enough to leave a dark impression in the rock.

For a moment there was stillness.

Nathan moved immediately, crossing the chamber in three strides, Kyomei raised to finish it—

The remaining serpents came from both sides at once, a wall of scaled bodies and snapping jaws flooding the space between him and Yorimasa, buying their master the seconds he needed. Nathan carved through the first with a clean diagonal cut, drove the second’s head into the ground with a heel, used the third’s own momentum to redirect it sideways — but they were large and relentless and each time he opened one, the poison mist spread further through the already contaminated air of the chamber.

Then the sound reached him — wet, rapid, rhythmic — and he turned to see Yorimasa no longer standing.

The Daimyo was moving on the floor. Slithering. His body had stopped pretending entirely, that too-long spine and those wrongly-jointed limbs folding into something low and fast and deeply unnatural as he shot across the chamber floor toward the tunnel and the stairs beyond. The motion was smooth and nightmarishly quick, more black mamba than man, the silk of his robes trailing behind him like shed skin.

"As if you’ll escape me," Nathan said.

He swept Kyomei through the remaining serpents in three rapid strokes — turning his face from the poison spray each time, ignoring the sting of it where it hit his arms and hands — and vaulted the bodies, sprinting through the tunnel after Yorimasa’s retreating form. The stairs blurred beneath him. The cold night air of the summit hit his face as he burst through the temple entrance and slid out onto open stone.

He felt it immediately — a shift in the pressure above him, something enormous and wrong dropping toward his position — and threw himself forward without thinking.

BADOOOOM!!

The stone where he’d been standing exploded inward, cracked to rubble by an impact that sent a shockwave rolling outward through the snow. Nathan rolled to his feet and raised his eyes.

The Orochi Temple was no longer alone on the summit.

Something vast and green-black was coiled around it — coiled over it — scales the size of roof tiles catching the moonlight in dull emerald gleams, a body so massive that where it pressed against the temple’s outer walls the stonework had begun to fracture under the weight. The head that turned toward Nathan was enormous, triangular, its jaw already slightly unhinged, the forked tongue that slid out between its teeth long enough to taste the air ten feet in front of its face.

And in that face, in those cold and ancient amber eyes, was something that had once called itself Daimyo of the Hebi-Yama.

"You will be delicious, Ronin," Yorimasa said — and the voice that came out of that serpent mouth still carried his cadence, his unhurried pleasantness, obscene inside something that large.

"So you’re a monster," Nathan said flatly.

The laugh that echoed from the mountainside was enormous and deeply, wrongly amused.

"I am the guardian of the Hebi-Yama!"

He struck.

The speed was categorically different now — no longer the evasive liquid movement of the humanoid shape, but something built for pursuit, built for closing distance and swallowing what it caught. The great head shot toward Nathan like a thrown spear, fast enough to flatten the snow in a wave ahead of it.

Nathan sidestepped by a margin that wasn’t comfortable and raised Kyomei in a broad upward arc, blade connecting hard against scales just behind the jaw—

The contact released a hiss of thick green vapor along the cut line. Not blood. Not simply venom dispersing in air. A pressurized cloud of it, dense and immediate, erupting from between the scales where Kyomei had parted them.

Nathan recoiled, pulling back hard, but the edge of it caught him before he fully cleared it — and this was different from the ambient mist in the chamber below. This was concentrated, purposeful, and it hit the back of his throat and his eyes simultaneously like cold fire. The vertigo that had been sitting at the edges of his awareness for the last several minutes surged forward, his legs briefly questioning their instructions, the world tilting by a fraction that his body could compensate for but his mind tracked with focused alarm.

He shook his head once, sharp and hard.

Too much. Between the Curses of Pandora draining steadily at his reserves and the poison already working through his blood from the mist below, he was operating on a margin that he would not normally have accepted. The only reason he was upright at all was the simple, blunt fact of what he was — Demigod blood ran slower to compromise than mortal blood, and his body was fighting back against the toxin with everything it had. But it was a battle with a clock on it.

Yorimasa clearly understood this. He circled at the edge of his own vapor cloud, massive coils sliding through the snow with a sound like rushing water, surrounding Nathan in a slow, patient spiral — tightening it, not rushing, content to let the poison do its patient work while the Ronin’s legs continued their quiet deterioration.

"Hehehehe..." The chuckle rolled across the summit like distant thunder.

"Yukihime — stay back!" Nathan called out sharply without turning, his eyes tracking Yorimasa’s circling form.

From the edge of his vision he caught her — still, pale, her hands already moving — and saw her stop at his command, though the look on her face said it cost her something.

Nathan’s gaze went back to the circling shape. The snow rose in drifts around the great coiling body. His face had gone slightly pale, the cold of the altitude and the cold of the poison meeting somewhere in his bloodstream in an argument his body was mediating through sheer stubbornness.

He let out a slow breath. Let his eyes close for exactly one second.

Celestial Rank Dark Magic.

The words formed quietly in the back of his mind, pulling at something deep and vast and very dark.

He raised Kyomei.

Yorimasa felt it — Nathan could tell by the way those amber eyes snapped toward him, the circling suddenly accelerating, the great head drawing back and then lunging with everything the transformed body had, maw fully unhinged, large enough to take Nathan whole.

"YOU ARE DEAD!"

Nathan opened his eyes.

"Black Sword."

He swung down.

The blade came through the arc and the darkness came with it — not a glow, not a shimmer, something more absolute than light or its absence, a tearing edge of pure cursed force that followed Kyomei’s path and then kept going, ripping through the air and into the ground and through everything between those two points. The sound it made wasn’t a crack or a boom so much as the sound of something fundamental being briefly interrupted.

The ground split. A clean, deep fissure tore across the summit from Nathan’s feet outward, racing through the stone and snow and crashing into the temple behind with enough residual force to fracture the front wall and bring the roof’s corner down in a grinding collapse of old timber and tile.

And through Yorimasa.

The great serpentine body recoiled — the head separating from the neck in a single violent instant, the severed halves falling apart in opposite directions, thrashing against the stone in their final reflex before going still.

Nathan stood in the ringing silence with Kyomei lowered, watching.

Then the severed head moved.

Not thrashing. It knitted — the severed neck elongating, reaching, rejoining itself with a wet and horrible efficiency, scales re-locking like a wound closing in fast-forward. The regeneration was rapid and wrong and deeply confident, and as the head reattached and turned toward him, those amber eyes held something new.

Not just hunger now.

The fangs came for his neck before he could fully track the motion — too fast, too precise, and aimed not at his center mass where Kyomei was already moving in defense, but at the vulnerable line just above his collarbone. The sword intercepted the attack’s original vector and Yorimasa simply bent around it again, that boneless serpentine flexibility surviving even the transformed state, and the fangs found their mark.

"Hgh—"

The sound Nathan made was brief and involuntary — less pain than the shock of something entering his body that had no business being there. Two points of cold fire burned into his neck, and immediately, deeply, something moved through his bloodstream that was categorically different from everything that had come before.

The other poison had been a fog. Disorienting, cumulative, manageable if stubborn.

This was a presence.

It entered him like something alive and hostile.

Yorimasa’s eyes gleamed seeing that.

"The Yamata no Orochi’s venom," he said softly, almost tenderly. "Not even a Demigod walks away from that, Ronin. You have minutes."

Nathan’s eyes opened.

They had changed.

The black was gone, replaced by a burning, molten demonic gold — not warm, not human, the color of something divine and furious looking out through a mortal face. The killing intent that rolled off him in that moment was not the controlled, directed pressure he had used on the road — it was something rawer and vaster, the kind of thing that made the air itself pull back.

His grip on Kyomei tightened until the knuckles went white.

BADOOOOOM!!

The pressure detonated from his body in a single outward wave, throwing snow and stone fragments outward in a perfect circle, the shockwave hitting Yorimasa’s coils and forcing them apart by sheer released force.

Then Nathan swung Kyomei down.

Not a technique. Not a named skill. Just every remaining fragment of what he was — Demigod blood and cursed blade and the cold, furious refusal to die in a snake’s stomach on a mountain in the dark — condensed into a single downward arc that hit Yorimasa’s body and did not stop.

The scales that had deflected and regenerated and circled and poisoned him simply came apart. The flesh divided along the blade’s path in chunks, the great serpentine form losing its coherence one catastrophic section at a time until what lay scattered across the summit’s stone was no longer something that could be called Yorimasa at all — just wreckage, steaming faintly in the cold mountain air, still at last.

The golden light faded from Nathan’s eyes then.

He stood in the silence with Kyomei at his side, the blade dripping dark, and the summit finally — completely — empty of anything that moved.

But then he glanced at the snake bite mark on his neck, burning purple.

He really had a bad feeling about this.