[FATE] OP Demon King Across Multiverse!

Medusa's chains slithered through the air, closing in like an unbreakable cage, sealing off all escape routes.

The battlefield was now a prison of steel, with Ryuu, Cú Chulainn, Mash, Ritsuka, and Olga trapped inside.

Medusa chuckled softly, her golden eyes gleaming.

"You've followed me this far, so I must commend you, Master of Caster."

Ryuu smirked, gripping his blade tighter.

"Heh, what's wrong, Lancer? You sure you don't wanna just run away? Three against one—you're not exactly in a winning position here."

Medusa's lips curled into a sly smile.

"Oh, but you're mistaken."

A violet glow flickered in her Mystic Eyes, and in an instant—

Everything in her gaze began to turn to stone.

Mash barely raised her shield in time, blocking the petrification effect from swallowing the group whole.

Ryuu, however, didn't take any chances.

He lunged at Mash, tackling her to the ground just as Medusa's gaze swept over them.

A split second later, the entire area where they had stood was reduced to stone.

"Mr. Ryuu… p-please let go of me!"

"Oh, right, my bad—just saving your life here."

"That's fine, but please, get up!"

Ryuu quickly released her, feeling the warmth of her skin lingering in his palm.

Damn. Shield girl's pretty soft.

Mash, red-faced, turned away in embarrassment, refusing to meet his gaze.

Cú Chulainn—who had been holding off Medusa this entire time—glanced over, scowling.

"Oi, Master, this isn't the time to be flirting! Get your ass over here and help me!"

Ryuu sighed, rubbing his temple. "Yeah, yeah, I got it."

He turned his focus back to Medusa.

Shit… I can't get in close.

One direct hit from her Mystic Eyes of Petrification would turn him into a statue. Right now, Cú Chulainn was only able to fight her at range using rune magic, but that wouldn't last forever.

Ryuu clenched his fists. I have Geass, but…

Unlike Berserkers like Hercules or Darius III, Medusa had full consciousness and reasoning.

If Geass could force even one second of hesitation, that would be enough for Cú Chulainn to land a killing blow.

The problem?

Geass only worked if the target made direct eye contact.

And there was no way in hell he could just stare at her without getting petrified first.

He needed a setup.

Ryuu's mind raced, then—an idea struck him.

"Caster! Follow my lead!"

Cú Chulainn glanced over. "Tch, fine—what's the plan?"

"Flame tornado."

Cú Chulainn's eyes widened slightly, then he smirked.

"Heh. I see what you're getting at."

Without hesitation, he drew several runes into the air, summoning a violent hurricane that spiraled upward into the sky.

Ryuu ignited his flames, activating Infernal Dragon's Wrath, and sent a blazing inferno straight into the whirlwind.

The fire and wind merged, forming a raging firestorm, cutting the battlefield in half—isolating Medusa from the others.

"Mash!"

Mash reacted instantly, dashing forward with her shield. With a single Shield Bash, she launched Ryuu straight into the flames.

He vanished into the inferno.

Medusa narrowed her eyes. "A foolish move."

With her Mystic Eyes, she could turn even fire itself to stone.

But just as she activated them—

Ryuu burst from the flames, lunging straight at her.

Their eyes locked.

"Geass—Absolute Order."

The crimson sigil ignited in his left eye.

Medusa's expression froze.

Her Mystic Eyes flickered violently, struggling against the new force invading her mind.

Ryuu grinned.

Got you.

"Lancer, in the name of the Demon King—die."

A red spectral sigil erupted from Ryuu's eye, forcefully overriding Medusa's will.

Her own Mystic Eyes of Petrification turned against her.

Her fingers twitched involuntarily.

Her grip on her spear tightened.

Then—she turned her own weapon on herself.

"Wh-What… my body… won't obey…" Medusa gasped, her own hands shaking as she attempted to stab herself through the throat.

She fought desperately, trying to resist the command—but Geass had already taken hold.

Ryuu smirked. "Checkmate."

With zero hesitation, he plunged his blade straight into her heart.

SHINK!

Medusa coughed up blood.

The chains surrounding them shattered.

The battle was over.

Medusa staggered, looking down at the wound in her chest. She gave Ryuu a weak smile.

"Heh… had I been summoned as a Rider, this wouldn't have ended like this…"

Ryuu met her gaze. "Yeah. Probably."

Medusa closed her eyes.

"Forgive me… my sisters."

With that, she vanished into golden light.

A robotic ding echoed in Ryuu's mind.

> "Ding! Congratulations to the host for killing Servant Lancer. +1000 Demon King Points!"

Ryuu smirked, wiping his blade clean. 2000 Demon King Points. Not bad.

Behind him, Ritsuka, Mash, and Olga were staring at him in absolute shock.

"That… that was INSANE!" Ritsuka blurted out.

Mash nodded rapidly. "Mr. Ryuu, you fought a Servant head-on and won… I-I've never seen a human do that!"

Olga folded her arms. "Are you sure you're even human?"

Ryuu chuckled, twirling his blade. "Probably not."

Cú Chulainn let out a low whistle. "Gotta say, Master, I knew you were strong, but that was some crazy shit."

Ryuu shrugged. "What can I say? Luck was on my side."

Mash hesitated, then suddenly clapped her hands together.

"Mr. Ryuu! Can you teach me that fire move? It was so cool!"

Ryuu smirked.

"Sure. First, find yourself a dragon for a parent, then we'll talk."

Mash's face fell.

Ritsuka burst out laughing. "Pfft—wait, that's how you got your powers?!"

"Obviously."

"That's so unfair!"

"Not my problem."

Olga massaged her temple. "Enough, enough! This isn't the time for jokes!"

Her gaze hardened.

"Ryuu… why did those Servants suddenly attack us?"

Ryuu exhaled, his smirk fading.

"…It's simple. Saber defeated them first."

The group fell silent.

"Wait, hold on," Olga muttered. "If what you're saying is true… then there are still at least five more corrupted Servants out there."

"Yeah," Ryuu confirmed. "And they're all coming for us next."

A tense silence followed.

Mash clutched her shield tighter.

Cú Chulainn scowled.

Ritsuka gulped.

Olga bit her lip. "At this rate… how are we supposed to win?"

Ryuu closed his eyes.

Then—he smirked.

"Simple."

He opened his crimson Geass eye once more.

"We take the fight to them."

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