The darkness of the Onyx Caverns was no longer a lack of light; it was a physical weight. Under the influence of Arain's [Abyss Domain], the very air had thickened into a viscous, cold soup of shadows. In this realm, the laws of the surface world—gravity, sight, and heat—were mere suggestions.
The Night-Stalker Queen, a Rank 6 nightmare of flesh and shadow, hissed. Her many eyes, usually glowing like rubies, were now dim, struggling to find a target in a world that refused to reflect her power.
"Trickery!" her telepathic voice shrieked, echoing inside Arain's skull like a rusty blade scraping bone. "You think you can hide from the mother of this mountain? I was born in the dark when your ancestors were still shivering in caves!"
Arain didn't respond with words. He was standing twenty meters away, his small feet barely touching the surface of the black, liquid shadow that now covered the cavern floor. He could feel her. Every vibration of her many legs, every frantic beat of her dual hearts. To him, she wasn't a terrifying boss; she was a reservoir of mana waiting to be tapped.
[System: Abyss Domain active. Mana Consumption: 5/second.]
[Target Analysis: Night-Stalker Queen. Rank 6.]
[Condition: Distoriented. Armor Integrity: 100%.]
"Ten seconds," Arain whispered, his voice calm, almost detached. "That's how long it takes for a predator to realize it has become prey."
He moved.
He didn't run; he glided. Using [Ghost Step] within his own domain made him faster than a blink. He appeared beneath the Queen's massive, bloated thorax. In his hand, a shard of pure Abyssal energy solidified into a jagged dagger.
Schlick!
He drove the blade into the joint of her rear right leg. It wasn't a deep wound, but depth wasn't the goal.
"Abyssal Corrosion: Inject."
A surge of dark, rotting mana poured into the wound. The Queen screamed—a sound that shattered the nearby purple crystals. Her blood, thick and black, hissed as it hit the floor.
"Insignificant worm!" She swung a massive, chitinous leg, fast enough to break the sound barrier. Arain didn't dodge. He simply dissolved. The leg passed through a cloud of grey mist where his body had been a millisecond before. He reappeared ten meters above her, standing on a thread of shadow he had woven into the air.
"You're fighting the darkness, Queen," Arain said, his red eyes glowing with a cold, predatory light. "But you forget... I am the darkness."
The Queen realized she couldn't hit what she couldn't touch. She retreated into her own nature. Her shadow-tentacles, the hair-like appendages on her head, began to grow, weaving together to form a protective cocoon around her body.
[Warning: Boss Skill Activated – Shadow Feast.]
[Description: The Queen is attempting to reclaim the shadows of the domain to heal her wounds and strengthen her armor.]
The floor of the domain began to ripple. Arain felt a tug on his mana. She was trying to out-drain the drainer.
"Hungry?" Arain's smile was jagged, lacking any warmth. "Then let me feed you something you'll never forget."
He reached into his tunic and pulled out the Solar Crystal he had stolen from the Sun-Eaters. It was still pulsing with the residual light of the Luxmore family, though now it was wrapped in purple veins.
"This is the light of a Great House," Arain said, holding the crystal high. "It's bright. It's pure. And for a creature of the dark like you... it's a lethal poison."
He crushed the crystal in his bare hand.
Normally, a Solar Crystal would explode in a burst of healing or protective light. But Arain had spent the last three days corrupting it. As the shards bit into his palm, the energy that erupted wasn't golden—it was a sickly, incandescent violet.
"Sovereign Art: Corrupted Flare!"
The explosion didn't push back the darkness; it weaponized it. A wave of violet fire roared through the cavern, hitting the Queen's cocoon with the force of a falling star.
The scream she let out this time wasn't telepathic. It was physical. The cocoon shattered. Her beautiful, plum-colored skin began to blister and crack under the "Holy" weight of the corrupted solar mana. To an Abyssal creature, nothing was more painful than Light that had been turned into a curse.
[Target Status: Crippled. Mana Core: Exposed.]
[Condition: Soul Shock detected.]
Arain landed on the ground, his knees buckling for a second. The 'Flare' had taken a toll on his small body. His arm was shaking, the blackened veins on his skin pulsing rapidly.
"Almost... there," he wheezed, wiping blood from his lip.
The Queen lay on the floor, her legs broken, her tentacles charred. She looked at the six-year-old boy walking toward her and saw not a child, but the shadow of the man he used to be—the Demon King who had once commanded legions.
"Who... what are you?" she whispered, her telepathy fading.
Arain stopped in front of her massive head. He placed a hand on her forehead, right between her many eyes.
"I am the mistake that my father couldn't kill," Arain said softly. "And I am the King you should have feared."
"Shadow Extraction: Final Form – Soul Harvest."
The cavern went silent. Arain felt a massive, thrumming energy transfer from the Queen into his own body. It wasn't like the Golden Swan's erratic energy; this was smooth, ancient, and heavy. It felt like a river of black ink filling his soul.
[Target Slain: The Night-Stalker Queen (Rank 6).]
[Experience Gained: 5,000 EXP.]
[Loot: Queen's Heart (Relic), Night-Stalker Silk, 2,000 Soul Points.]
[Level Up! Level 10 -> Level 13!]
[Level Up! Level 13 -> Level 15!]
[Blood Ritual: 66% Completed.]
[Requirement for Final Phase: The Heart of a Hero.]
Arain slumped against the Queen's dead body, his small chest heaving. Level 15. He could feel his muscles becoming denser, his senses sharpening to a point that felt almost painful. He was no longer just "trash" or a "failure." He was becoming a force of nature.
But the System wasn't done.
[Warning: External Breach Detected.]
[Proximity Alert: 500 Meters.]
[Signatures Identified: The Great Hunt Vanguard – 12 High-Tier Paladins.]
Arain's eyes snapped open. He could feel it now—the scent of incense, the hum of holy prayers, and the burning heat of sun-mana. They had followed the 'Flare'.
He looked at the Queen's heart in his hand—a pulsing, black gem the size of a melon. He didn't have time to rest.
"The Heart of a Hero," Arain muttered, looking toward the cave entrance where the first rays of "Holy Light" were starting to leak in. "They didn't come to hunt me. They came to offer themselves as the final sacrifice."
He stood up, his pale face illuminated by the dying glow of the Onyx crystals. He didn't look afraid. He looked hungry.
"Come," Arain whispered to the darkness. "The King is ready for his guests."