Lucivar Thornheart stood still as the last echoes of battle faded into the fog-drenched forest. The air, thick with mist and tension, had fallen unnaturally quiet—like the world itself was holding its breath, watching him. Behind him, the demon's body lay motionless in a pool of blackened blood, the liquid seeping into the roots like ink staining the veins of the earth. It was a grotesque painting of violence, and yet, Lucivar remained upright. Alive. Against all odds.
He was untrained. Unarmed. Unprepared.
And yet… he had survived.
Something ancient had stirred in him during the fight—something not born of reflex or logic, but instinct. A raw, primal hunger had surged through his veins, guiding his hand when his mind failed. He didn't yet understand the rules of this new world, but deep within, a truth had already begun to burn:
This world recognized him.
Then the screen appeared.
Floating in the air like a divine tablet, softly pulsing with crimson and gold light, it cast a surreal glow across the forest floor. Its presence was alien yet intimate—cold in form, yet warm in implication. It wasn't just a system.
It was a mirror.
A voice without sound. A fate without choice.
And for the first time in either of his lives, Lucivar Thornheart felt truly seen.
SYSTEM INTERFACE – USER: LUCIVAR THORNHEART
Authority Recognized: Human
Initialization Complete. Core Functions Online.
SELECT A FUNCTION:
[Status Sheet] [Newbie Gift Package] [Devour Protocol – Species Absorption] [World Travel] — LOCKED
Lucivar exhaled, the tension in his shoulders easing as he took in the options before him. "Well... guess this is real. No better place to start than the beginning."
He tapped [Status Sheet], and the interface shifted, lines of data streaming forward.
STATUS SHEET – USER: LUCIVAR THORNHEART
Race: Human Age: 18 Class: Unawakened Title(s): None Affiliation: None Alignment: Unknown
TRAITS
• Adaptive Mind – Learns faster than average
• Survival Instinct – Brief danger sense when facing death
• Fragmented Past – Some memories are sealed
STATUS: STABLE You are currently classified as a baseline human. No spiritual bloodline detected. Mutation threshold: 0%
Lucivar scoffed. "So... I'm basically a nobody. A glass cannon with no ammo."
Still, the very existence of a system like this meant there was a way out. A way forward. He didn't expect miracles—but he would take opportunity.
He moved to the next option.
[Newbie Gift Package]
His finger hovered for only a second before he tapped.
The interface blossomed into something more intricate, more alive.
Choose One of the Following Enhanced Gifts:
Option One: [Enhanced Hashira Legacy – Supreme Breathing Dominance]
Flame Breathing
Mist Breathing
Sound Breathing
Stone Breathing
Wind Breathing
Water Breathing
Serpent Breathing
Insect Breathing
Sun Breathing
Option Two: [Enhanced Muzan Lineage – Demon King Overload Core]
Absolute Regeneration
Demon Blood Art
Curse of Submission
Cellular Division Control
Demon Creation
Muzan's Mind Split
Enhanced Physicals
Abyssal Black Blood
(Note: All gifts are given without limit. Their true strength is revealed only through your resolve to master them .)
Lucivar stood in the haze of pulsing red code, the system's light casting sharp shadows across his face. His gaze lingered longer on the Hashira option than expected. There was something noble about it—mastery, discipline, and the raw beauty of skill. But that wasn't him. That wasn't his path.
"…Even if I chose to become a Hashira," he muttered, voice low, "I'd still die when my time came. But if I became a demon… I could live forever. For someone who died in his last life, immortality was a dream he never got to touch
His soul didn't seek balance. It craved hunger. Power. Dominion.
"I'm no hero," he said softly. "Give me the abyss."
He selected Option Two.
The forest around him pulsed.
Darkness seeped into his bones, coiling into his DNA. He staggered as something massive and ancient whispered into his blood. His body shifted. His essence cracked. And the system responded.
STATUS SHEET
Title: True King of the Abyss ・ Demon Progenitor Race: Origin Demon (Primordial) Age: 18 Affiliation: None Alignment: Chaotic Evil
Abilities:
Cursed Eternity – Exists beyond time and fate. Cannot be erased, undone, or rewritten.
Thornheart Regeneration – Instantly reforms from any injury, even decapitation or vaporization.
Soul Transfer – Can inhabit other bodies, retaining full might and presence.
Crimson Apex – Possesses monstrous strength and speed beyond all mortal or infernal kin.
Flesh Sovereign – Commands every cell in his body; can evolve, shift, or weaponize them at will.
Blackcore Multiplicity – Grows additional hearts and brains with each power ascent, enhancing resilience and thought-speed.
Abyssal Whips – Generates tendrils of living shadow, striking at subsonic speeds from all directions.
Blood Reign – His blood transforms demons into worshipers; loyalty is no longer taught—it is inherited.
Netherlink Command – Speaks through the minds of his creations across all realms, seeing and hearing through their senses.
Scent of the Unseen – Tracks threats and intentions across distance and worlds with perfect clarity.
Unique Power:
Perfect Demon Creation – Births eternal followers through blood alone. All are sunproof, death-defiant, and bound to evolve forever.
Children of the First Drop – Born from a single drop of his blood. Serve as scouts, servants, and shock troops. Iron Circle Dreadknights – Forged from greater blood, they command in war, regenerate swiftly, and inspire fear. Bonded Flames – Female soul-bound consorts who evolve with Lucivar's power. Each wields a unique ability tied to their bond.
All creations share: Sunlight Immunity ・ Perfect Obedience ・ Endless Evolution ・ Blood Resurrection
"Crap," he said, lips curling into a crooked smile. "I'm actually overpowered."
Power hummed in his veins. He could feel it. No more fragility. No more limits. The old Lucivar—sick, dying, pitied—was gone.
Then, curious, he turned to the third function.
[Devour Protocol – Species Absorption]
He selected it.
Devour Protocol – Species Absorption Status: Active Soul Authorization: Confirmed
Effects:
Absorb racial traits and passive abilities from slain or consumed species
Gain random mutation or skill per target
Permanent power boost scaled to target strength
Species-specific immunity
Evolution bonus upon devouring 10+ of the same kind
Note: Divine, Abyssal, or Celestial beings may resist. Partial devours may destabilize essence.
WARNING: First devour binds your core forever. Proceed?
[Yes] / [No]
Lucivar Thornheart gazed upon the demon's broken body, a quiet testament to what defiance earned. Then, without hesitation—
Yes
Devour Protocol bound to user: Lucivar Thornheart From this moment forward, the multiverse is your banquet.
His body tensed briefly as data flooded his mind. Text flickered before his eyes:
[You have devoured: Lesser Demon] Species Traits Absorbed: Minor Claw Strength, Basic Night Vision Random Demon Art Unlocked: Blood Bubble Generation
Lucivar blinked. "Blood... bubbles?"
A pause. Then he sighed.
"Well, I guess not every power can be flashy right out of the gate." He waved the notification aside. "Still, what kind of twisted joke is that for a first reward?"
The system didn't answer, but Lucivar chuckled dryly anyway. "Guess I'll just have to work with what I get... until I take what I want."
He slapped his forehead, laughing bitterly. "Is this even an option?"
"I just killed something, absorbed its essence, and I'm going to be eating more."
He paused.
"I always thought it was dumb when protagonists clung to morality in worlds begging them to evolve. This? This isn't subtle. It's a declaration. Become a demon or die human."
Lucivar stood taller. This wasn't transformation. This was recognition.
It wasn't the system that made him this way.
It simply gave him permission to stop pretending.
He had never truly been human. Not where it counted.
And now, with power echoing in his blood and the abyss answering his call, he was ready.
He was no longer the sick boy forgotten by fate.
He was the abyss made flesh.
And soon, this world would learn what it meant to kneel.