Harem Startup : The Demon Billionaire is on Vacation

Chapter 670 – You Have No Idea How Unreasonable I Can Be

The Overlord lunged.

Lux threw the dagger.

It pierced the air.

Straight into the center of the ledger projection.

The runes screamed.

The abyss cracked.

The Overlord roared, first in rage, then in fear.

And Lux?

He kept laughing.

Because sometimes?

The only way to close a debt...

Was to bankrupt the entire system.

Black light surged around the ruptured ledger core, flickering with ancient code unraveling at the seams. Cracks spread like spiderwebs across the abyssal walls. But Lux wasn’t done. Not even close.

He raised his hand again.

And in a smooth, arrogant flick of his wrist, summoned the second dagger.

Amore.

Its blade shimmered with seductive crimson, the aura around it pulsing like a heartbeat that refused to die. Etchings carved in sin’s language danced along the curve, glowing brighter with each second Lux held it.

”Meet your match,” Lux grinned, spinning the Lust Dagger once between his fingers. ”Left hand for business... right hand for pleasure.”

The Overlord surged toward him in an instant, its robes unraveling into abyssal tendrils, its mouth splitting open with rows of teeth and black fire erupting from within.

Trying to crush him inside its own core.

The air twisted. A deafening hum swept the realm. The Overlord activated environmental override.

[Abyssal Core Skill: Void Domain Compression – All internal energy begins to destabilize.]

The very space around Lux tightened. The ground hissed. Gravity spiked. A normal demon would’ve collapsed to the floor in seconds, bones snapping under the pressure.

But Lux?

He just reached calmly into his storage and pulled out a single, old-looking coin.

Greed-sigil pressed deep on both sides.

He flipped it once, casually.

[Item Deployed: Artifact – Equity Balancer, ”Coin of Equal Blood”]

[Grade: Legendary – Greed Core Artifact]

[Effect: Temporarily enforces a relative balance of combat power within the active domain. All entities’ power output capped to local average.]

Lux caught the coin.

And everything froze.

The Overlord’s pressure plummeted.

His environmental hacks?

Neutralized.

Lux’s grin sharpened. ”Now we’re fair.”

He teleported in a blink... behind the Overlord.

Two daggers flashed.

One Greed.

One Lust.

And both cut deep.

The Overlord shrieked, twisting its body with unnatural fluidity, but not fast enough to avoid the first strike across its spine. Black ichor spilled into the air, like corrupted smoke and venom merged, and Lux pivoted, flipping in the air as he drove the Lust dagger downward through a weak point in its exposed back.

The Overlord retaliated instantly. Its arm transformed into a scythe of pure debt-rune metal, slicing sideways with speed that shredded the very air.

Lux teleported again, right above it.

And summoned the first wave.

[Skill: Demonic Orbs Activated]

Black spheres exploded into existence around him. Orbiting like crazed planets. Each one sparking with curse sigils, minor detonation glyphs, and some bouncing unpredictably with volatile glee.

They swarmed.

Dozens collided into the Overlord’s body at once, detonating in controlled pulses. The air filled with flashes of purple-black explosions. Its robe-arm whipped around in desperation, trying to deflect the orbs, but they rebounded, ricocheting like possessed marbles across the core walls, only to come back harder.

The Overlord reeled backward, screeching in a thousand broken voices. Its shadow tried to reform, but Lux was already there, rushing in with dual daggers slashing crosswise at the core’s center mass.

”Dark Healing,” Lux muttered casually as the Overlord’s retaliation finally landed, cutting deep across his shoulder. Blood spilled, but instantly reversed, veins glowing black as the wound healed mid-motion.

”Come on, you ancient accounting mistake,” Lux taunted. ”You’ve got more, right? Or was that your opening bid?”

The Overlord roared, and the very floor beneath Lux opened into a pit of gnashing mouths and broken sigil shards.

He leapt into the air with boosted agility, flipped twice...

And cast his next favorite card.

[Abyssal Grasp Activated]

The core floor erupted.

Massive black tendrils surged from the cracked abyss, writhing like eldritch serpents.

They pierced the Overlord’s leg. Snared its shifting ribcage. Crushed its arm as it tried to conjure more attacks.

The Overlord screamed.

Lux landed lightly atop one of the tendrils as they dragged the entity backward, slamming it into its own core structure, like throwing a banker through their vault.

Blood-black ichor sprayed across the air.

”You wanted to corner me,” Lux snarled, twirling both daggers. ”But I don’t do corners. I flip the whole damn board.”

The Overlord pulsed with rage. Runes flared.

[Core Defense Initiated – Heart Seal Protocol]

From the walls of the core, hundreds of floating iron-bound glyphs emerged, each glowing with suppression arrays. They formed a circle around the heart of the Overlord, shielding it from further strikes.

Lux’s eyes locked on the structure.

A glowing, spiraling sphere suspended mid-air, the true core.

Surrounded by glyphs. Rotating. Sealed tight.

”Oh,” he whispered. ”There you are.”

The Overlord’s fragmented voice echoed all around him. ”You... cannot reach it. This domain is mine. My laws. My seal. You are just a young prince of greed. You will submit.”

Lux laughed again.

Blood on his shoulder.

His jacket slashed open.

Eyes glowing.

Lips sharp with teeth and war.

”You have no idea how unreasonable I can be.”

He dashed forward, straight into the next barrage of rune cannons firing from the Overlord’s glyphs.

The walls screamed with sigil-light.

But Lux spun, summoned a barrier mid-sprint.

[Barrier Activated]

The blasts hit, but bounced off his kinetic shell in a flurry of light.

He slid under one projectile, flipped off a spinning orb...

Then hurled his Greed dagger like a missile.

It tore through two glyphs, exploding them instantly.

Lux appeared behind the third with a teleport blink, slashing the Lust dagger across the rune’s spine.

More glyphs crumbled.

The Overlord howled again.

”Too slow,” Lux said, panting slightly, licking blood from his lip. ”You’ve been calculating for centuries, but you forgot the most basic investment rule.”

He crouched low, power flooding both arms.

”Never bet against someone who loves taking risks.”

And then he charged the final line of defense.

Fangs bared.

Daggers ready.

And his eyes locked only on that core.