As the space around them shrank again and again, everyone understood—
They could not afford to drag this out any longer.
The devil's magic power was beyond reason. If the battle was not ended swiftly—
All of them would die within the Shadow Palace.
Licht and Lumiere exchanged a glance.
"Forgive us. The surroundings are in your hands for now," Licht said first, golden eyes grave. White mana began radiating from his body. "We cannot allow you of this era to perish."
"They are the mages who bear the future of the Clover Kingdom," Lumiere added solemnly.
The next instant—
Lumiere placed his hand over the Demon-Dweller Sword in Licht's grip.
Blinding radiance erupted from the blade, illuminating the darkened chamber.
"The Demon-Dweller Sword is a blade that can house the mana of those bound by bonds," Lumiere said with a faint smile. "Our mana—capable of resisting devil power—"
"Will be transmitted through this sword to everyone within the Shadow Palace!"
Together they shouted:
"Combined Magic — Demon-Dweller Sword: Protecting Light!"
BOOM!
Brilliant beams of white light burst from the sword, spreading throughout the entire palace.
Every mage present was wrapped in luminous radiance—
Shielded from the black-blue gel rapidly filling the space.
Only Asta remained untouched, his anti-magic incompatible with the blessing.
Even Yuuki and Yuno were enveloped in white light.
Yuuki raised a hand, studying the glow around him.
"The power of Light Magic and Sword Magic… warm, yet unyielding."
He clenched his fists.
"With this reinforcement, we can abandon defense—and attack with everything we have!"
His mana surged violently.
"Whoa, whoa! What's that glow? Why don't I have one?!" Asta shouted in envy.
Yuno replied calmly, "Because of your anti-magic, idiot. Besides, you don't need protection from that disgusting gel anyway."
Yuuki moved, appearing between them.
He fixed his eyes on the Word Soul Devil above.
"You've noticed it too. The heart is his weakness. Especially when Asta attacks—he deliberately shifts it."
His voice was firm.
"So, we must confirm its position."
Asta tightened his grip on the enlarged Demon-Slayer Sword.
"Then what do we do?"
Yuno answered quietly, "Yuuki and I create the opening. You land the killing blow."
Yuuki nodded.
No matter how much damage they inflicted, the devil regenerated instantly.
Only Asta's anti-magic truly made him wary.
The final strike had to be his.
"Foolish insects!"
"Die!"
"Turn to dust!"
Mad whispers echoed from the countless mouths covering the devil's body.
He spread his arms, crimson eyes blazing.
"Struggle all you want. You will all die here!"
"Stop sentencing us without permission!" Asta roared. "You disgusting, mouth-covered freak!"
Yuno smirked. "Fighting someone this strong… how exhilarating."
Yuuki laughed.
His mana darkened into deep crimson.
Muscles swelled.
His frame expanded to over two meters tall.
Behind him, vast wings like Salamander's unfurled.
Flame-shaped armor engulfed his body.
"Beast Magic — Full-Body Enhancement!"
"Fire Spirit Magic — Spirit Descent: Vulcan!"
BOOM!
Terrifying crimson mana poured from him in surging waves.
Wild.
Ferocious.
Overwhelming.
Asta and Yuno felt their hearts jolt.
"That's insane…"
"Ridiculous…"
Yuuki grinned.
"What? I can't get stronger too? Yuno, I learned this fusion method from you."
He flexed his fist, feeling the Fire Spirit merge completely with him.
He could command the fire element of natural mana at will.
He himself had become flame.
"Let the three of us shut him up for good!"
In an instant—
Red.
Green.
Black.
Three streaks of light shot toward the devil.
The devil waved a hand.
Massive gel serpents surged from all directions.
Larger.
Faster.
More numerous than before.
Yuuki's wings beat once—
He vaulted above dozens of serpents.
"Burn to ash!"
He punched downward.
Under Spirit Descent, his flames reached nearly 2,000 degrees Celsius.
In a breath—
The serpents below were incinerated.
A colossal serpent lunged from behind—
Yuuki turned and smashed it midair, detonating half its body in a fiery explosion.
Below, Asta and Yuno were entangled by swarms.
Yuuki shot upward, piercing through waves of gel with a spiraling blaze reinforced by Protecting Light.
He burst near the devil.
"Meaningless!" the devil sneered.
"Return!"
An invisible force struck Yuuki—
Forcing him backward.
"A single word won't stop me!"
Yuuki roared, slicing open two spatial gates.
"Close—"
"Meow!"
A red cat appeared atop Yuuki's head.
Fate Magic clashed with Word Soul Magic.
One gate collapsed.
One remained.
Yuno burst through it.
"Yuuki!"
They grasped hands.
Their white protective lights merged.
Fire and wind fused violently.
"Disappear!"
"Retreat!"
"Divide!"
Command after command crashed down.
"Meow!"
The red cat dissolved entirely.
Yuuki's face drained of color—
But his eyes burned bright.
"Now!"
"Go!!"
They accelerated with explosive force—
Reaching the devil in an instant.
"Spirit of Zephyr!"
Yuno slashed the devil's chest.
BOOM!
Mana exploded.
"Insignificant humans!"
"Stop!"
"Weaken!"
"Return!"
Yuno's arms trembled.
He was reaching his limit.
"Shut those filthy mouths!"
Yuuki roared.
"Key Magic!"
A seven-colored sphere—the Elemental Orb magic tool—hovered before him, amplifying his mana.
Golden ripples filled the air.
Keys materialized—
Piercing every mouth across the devil's body.
"Lock!"
The keys turned.
The devil's speech distorted.
"Filthy—!"
"Remove—!"
Cracks formed in the keys.
Yuuki trembled violently.
This was far beyond the weakened devil of 500 years ago.
His body and grimoire made him monstrous.
The resistance was overwhelming.
"Too slow!"
Yuuki and Yuno shouted in unison.
BOOM!
Asta's Black Divider cleaved into the devil's back.
"AAAAAAAH!"
The devil screamed in agony for the first time.
Pressure lifted.
Yuuki forced his hands inward.
"Surpass your limits—right here!"
"Lock!"
CLICK!
Every mouth shut.
Only the key in the devil's grimoire shattered.
Yuuki grimaced.
As expected—
He could not seize devil power directly.
Not yet.
The devil raged, weakened.
"Useless insects—!"
But one mouth alone could not overpower three.
With a final roar—
Asta and Yuno cleaved him in half.
Even so—
The body began to rejoin.
Sweat poured down their faces.
They searched—
And found it.
The heart.
"Now!"
"Radiance of the Little Sun!"
"Spirit of Zephyr!"
"Black Divider!"
BOOM! BOOM! BOOM!
All three attacks struck the heart simultaneously—
Shattering it.
"…Impossible…"
The Word Soul Devil stared at them in disbelief.
His body disintegrated—
And vanished.
(End of Chapter)
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