The Heroes of the Surface
While the abyss swallowed Akira, the Kingdom of Oakhaven celebrated its saviors. Two weeks after the "useless" student had been cast into the S-Rank pit, Mizuki, Sakura, and Kaiju had finished their basic training. The King had pampered them with the finest silks, the softest beds, and the richest foods. They were no longer students; they were the Swordsman, the God Mage, and the Assassin.
The King stood before them in the throne room, his voice booming. "Heroes, you were summoned for a purpose. This world is divided between Humans, Elves, and Beastmen—but a fourth power has awakened. The Demon Realm has fractured. Primordial and God-class demons are slipping through the cracks. You are our only hope."
Their first test was simple: a D-Rank dungeon. Ten floors of weak monsters, meant to give them "experience." They were escorted by a dozen elite Royal Guards—not to help, but to ensure the "precious" heroes didn't get a scratch.
As they marched through the city, the commoners cheered. "Save us, Heroes!" they cried. Sakura waved, her face glowing with pride. Mizuki gripped his legendary blade, feeling like a god.
But inside the dungeon, the reality was different. On the first floor, ten Level 10 Hobgoblins emerged.
"Heavenly Slash!" Mizuki roared, swinging his blade wildly.
"God Fireball!" Sakura screamed, unleashing a massive, uncoordinated blast of heat.
"Double Slash!" Kaiju added, darting in and out.
They weren't a team; they were three individuals showing off. The Royal Guards watched from the shadows, whispering in disgust. "Look at them," one knight muttered. "No coordination. No tactics. They're just swinging blindly. Are these really the ones meant to save us?"
By the second floor, they faced Fire Wolves. By the third, Stone Bulls. Because the monsters were weak, the Heroes succeeded. Each kill brought a level-up. Mizuki hit Level 35, Kaiju Level 30, and Sakura Level 25. The system granted them their ranks: Rank S.
"We're invincible," Mizuki laughed, wiping a drop of sweat from his brow.
Then came the Fifth Floor—the Mini-Boss. A three-headed Skeleton Wolf.
The Knights stepped back, allowing the Heroes to lead. Mizuki charged with his "Heavenly Strike," but the Wolf wasn't a Hobgoblin. It sensed the mana movement and sidestepped, slamming its skeletal tail into Mizuki's chest. The "Hero" flew backward, coughing up blood. Kaiju tried a stealth attack, but the second head spotted him instantly, biting his shoulder and tossing him against the stone wall like a ragdoll.
Sakura shrieked, creating a "God Barrier," but the wolf's triple fire-blast shattered it instantly. She collapsed, blood trickling from her ears. The Royal Guards had to jump in to save them, slaughtering the wolf in seconds.
Back at the palace, the Knights reported to the King. "They are unreliable," the Captain said coldly. "They don't watch each other's backs. They are children playing with fire."
Mizuki woke up in his silk bed, his eyes burning with a selfish rage. "Never again," he hissed. "I am the Hero. I won't lose."
They spent the next month training under even more protection, completely forgetting the boy they had sent to die.
The Monster of the Abyss
One month had passed in the surface world. In the time it took the "Heroes" to clear five floors of a D-Rank dungeon, Akira had died and been reborn a thousand times.
He stood at the threshold of the 16th Floor.
He didn't have Royal Guards. He didn't have cheers. He didn't have a silk bed. He had , a soul-reaping scythe, and a mind split in two to prevent himself from going insane.
"Let's check my stats one last time," Akira muttered. His voice was a rasp, unused to speaking to anyone but the shadows.
[STATUS: AKIRA ]
[LEVEL: 46]
[RANK: SSSSS]
[GRIMOIRES: 10/10 STACKED]
"Assistant," Akira said, his eyes glowing with a predatory violet light. "Enter the 16th Floor. Dampen the audio filters. My ears... I can already hear the blood pumping."
The Vascular Vaults
As Akira stepped off the final stair, the environment shifted. The stone walls of the 15th floor vanished, replaced by walls of deep crimson, pulsing muscle. The air was thick, humid, and smelled of heavy iron. He wasn't in a dungeon anymore; it felt like he was walking through the throat of a god.
Huge, transparent arteries—the size of tree trunks—snaked across the ceiling, carrying glowing, pressurized blood. The floor was soft and wet, squelching under his boots.
Suddenly, the floor beneath him heaved. From the "veins" of the walls, the 16th Floor's residents emerged.
The Hemoglobin Sentinels.
They were seven feet tall, made of hardened, black marrow armor with liquid blood circulating through their translucent limbs. They didn't have eyes; they had sensory pits that tracked heat and vibration.
Akira didn't wait for them to charge. He wasn't the boy who hesitated anymore.
"Nightmare Mist."
He thrust his hand forward. A thick, oily black smoke erupted from his palm, filling the fleshy corridor. The Sentinels stopped. Their sensory pits flared. Inside the mist, the Labyrinth's own monsters began to scream. They saw the "Heart" of the dungeon stopping. They saw themselves being drained of their own life force.
"Split Mind: Active."
While one half of Akira's brain maintained the nightmare, the other half began the slaughter.
"Shadow Movement."
Akira vanished into the dark corner of an artery. He reappeared behind the first Sentinel. His Spectral Scythe was wreathed in Abyssal Inferno.
Slash.
The blade cut through the marrow armor like a hot knife through butter. The liquid blood inside the monster didn't spill; it hissed and evaporated instantly under the black flames.
"Six left," Akira whispered.
The Sentinels tried to coordinate, shooting pressurized jets of blood like high-powered water cutters. Akira didn't even dodge.
"Ice Barrier: 10-Layer."
The blood jets hit the ice and froze instantly, creating jagged red sculptures in the air. Akira snapped his fingers.
"Sound Wave Manipulation: Amplify."
The sound of the high-pressure blood hitting the ice was captured and roared back at the Sentinels. The vibration was so intense that the liquid bodies of the monsters began to boil and burst. Their black marrow armor shattered.
"Point Shot: Rapid Fire."
Needles of condensed fire and ice flew from Akira's fingers, piercing the "cores" of the remaining Sentinels. One by one, they collapsed into puddles of inert ichor.
Akira stood in the center of the carnage. He didn't feel pride. He didn't feel like a "Hero." He felt hungry.
"LEARN. READ."
The Grimoire flipped open, absorbing the essence of the Hemoglobin Sentinels.
[NEW SKILL ACQUIRED: BLOOD MANIPULATION (TIER 1)]
[DESCRIPTION: ABILITY TO CONTROL EXTERNAL LIQUID BLOOD. CAN BE USED TO CREATE BLADES OR TRACK ENEMIES THROUGH THEIR CIRCULATORY SYSTEMS.]
Akira looked at his hands. The 16th floor was a world of biology, and he was becoming its master. He looked further down the hall, where the "Heart" of the world pulsed with a deafening THUMP-THUMP.
"Mizuki... Sakura..." Akira's voice was cold, colder than the ice he summoned. "You're playing at being heroes in a sandbox. You're leveling up on scraps while I'm eating the world that was meant to kill me."
He stepped over the puddles of blood, his shadow stretching long and jagged against the pulsing walls.
"Train all you want. When I finally climb out of this hole... I won't be the friend you remember. I'll be the nightmare you can't wake up from."
Akira turned the corner, descending deeper into the Vascular Vaults. He was Level 47 now.