I Reincarnated as a Demon King,I Will Kill Everything

The throne hall pulsed softly like the chest of a giant who had just finished running. An illusory map of the High Cathedral hovered in the air—a cube of light that mapped the bell tower, the seal grid, and the choir passages in the building's bowels. My forces assembled: Selena, Nana, Malrik, Nysha, Clarissa, and the technical core—Simon and Algor. Zereth was transported to the Lower East infirmary, bound by soul splints and shadow guards.

A side door opened. Algor entered carrying an obsidian tray. On it were three vials—jet-black crystals filled with a bluish-silver liquid that swirled on its own, reflecting light like a moon crushed to liquid.

Algor knelt. "As commanded, My Lord. Elixir of Celes—a distillation of the hero's core. Three vials. Each vial increases soul output and grants temporary holy resistance."

I stared at the vials. "Composition?"

"Condensed saint marrow, purified lunar ash, Nightshade Myrrh binder, and sealing from the Loom of Amon to prevent breaking the anchor. Effects:

-+20–35% soul output (depending on host stability),

-High Light/Holy Resist for 8–12 minutes,

-Slight edge effect—sharpens focus and reflexes.

Risks: Memory bleed from Celes residue, soul burn if the anchor is unstable, and withdrawal crash after the effect."

Noa echoed from my gauntlet, flatly. "Aura verification match. Potent. Hosts with shaky anchors—forbidden."

Selena glanced at me. "For who, My Lord?"

I glanced down the line. "Three bottles. Zereth isn't allowed yet—the anchor is just being sewn.

-First bottle: Rena. You're the spearhead inside the sanctum—you need immunity to holy in the early minutes.

-Second bottle: Selena. You're the breach leader. When we break the ward pillar, we can't lose you.

-Third bottle: Nana. Our shield. You're the one who carries the Moonbane stake to the choir altar."

Nana looked down, her eyes gleaming. "Orders received."

Algor added cautiously, "Take half before entering, the other half upon first contact with the seal. Not all at once—risk of overdrawing."

I nodded. "Listen,this isn't just any dope. This is a knife—hold it with the right hand."

Rena stepped forward, accepting the first bottle. "I'll use it right when [CHAOS DOMAIN] opens."

Selena spun the second bottle, a faint smile on her face. "If the sacred explodes, let my ice do the heavy lifting."

Nana held the third bottle with both hands. "I won't back down."

"Good." I pointed to the illusion map. "Plan: two nights after the half moon. We hit three phases."

I pointed to the bell tower and the outer wall.

"Phase I – Silence: Nysha, you enter first through the northern airwell. Disable the Bellward and the Rope of Choir. Place three shadow spikes at the nodal points—Simon?"

Simon held up a roll of cloth: seven dark spikes with runic tips. "Moonbane Spikes. Forged from a fragment of Darrius's Storm Shard, Elrodan's lunar ash, and the core of a paladin's helm. Its purpose: to reverse the flow of the sacred choir into a hollow echo."

"Phase II – The Crack: Selena leads the breach into the eastern and western Ward Pillars. Nana leads with Cheondan: Shield Fortress ➜ Guard Break. Malrik summons Gorewurm to break the guard formation. Clarissa handles medics and supplies—your blood acts as coolant for anyone overheating the elixir."

Clarissa smiled palely. "I'll provide cold Blood Draught."

"Phase III – The Heart: Rena enters with me into the Inner Sanctum. Target: The Conclave and the choir engine. We reverse their litany, not just break it. If Kravius ​​appears—I'll hold back. Rena, you cut the rite's channel."

The sound shifted; the tower's stones seemed to bow. Behind them, the Undercrypt's throbbing echoed.

I looked at each one.

"Risk: high. We're not after glory—we're after function. The cathedral must be silent after we return."

Noa followed, technically, "Elixir usage notes:

-Pre-assault – 5 minutes: half dose.

-First holy contact / upon entering Ward Ring: the remainder.

-Danger signs: tremors at 0.6 Hz, splitting vision, or whispers of foreign memories. Immediately to Clarissa for cooling."

Rena raised her bottle. "If Celes's memory bleed comes, I'll handle it."

I nodded once. "If any form of Celes remains, it's just an echo. We don't negotiate with echoes."

Selena closed her helmet. "Then there's one thing left: when do we start breathing heavily?"

"Now." I pointed to the training floor. "60x gravity for the core. 30x for the breaching squad. Two hours—rest—two hours to go. Simon, install the second Soul Splint on Zereth in the third hour, then send it to the throne room for synchronization."

"Obey."

I turned to Algor. "Listen to the elixir pulse. If there's any sign of resistance—I'll override."

Algor bowed deeply. "Ready."

There was a moment of silence. Then I raised my hand, gathering all the waiting eyes.

"This isn't just revenge. It's the lifting of shackles. The cathedral is a mouth that slowly devours the world. We sew up Zereth's soul—tomorrow we rip their throats open."

Armored hands echoed in my chest, in unison.

"YES, MY LORD!"

The illusion of the map vanished. Only the beating of the castle and the glimmer of three elixir vials in the hands of the chosen ones remained.

I looked at Rena. "Drink—test a drop."

She uncapped the cap, dropping a drop onto her tongue. For a moment, her pupils narrowed, the tamed holy glow clashing with the Chaos in her veins, then merging like molten metal finding its mold.

"The taste of iron," she said softly. "And the cold of the moon that stifles pain."

"Listen to your rhythm." I nodded to Selena and Nana—both of them repeated the drop ritual. Noa counted, Clarissa placed the back of her hand on their necks, making sure their soul temperatures didn't rise wildly.

Everything was stable.

I rolled my shoulders—the crack of the wound still singing—then stared up at the hellish sky descending like a curtain. "In two nights, the Supreme Cathedral will learn to spell silence."

Noa whispered, a subtle tremor that only I heard. "And the sword hero will learn,what it feels like to be waited for."

I smiled faintly. "Let it come. We're ready."