Dawn broke over the Ravine Outpost in a wash of pale lavender. The jagged palisade cast long, imposing shadows across the dirt. For the first time since Arthur had awoken in this subterranean nightmare, the camp was silent not from despair, but from exhaustion and security.
Arthur stood by the reinforced wooden gate. His chitin chest plate rose and fell with slow, measured breaths. Beside him stood First. The Elite Kobold was a statue of rust-red iron and dense muscle; his golden eyes were fixed entirely on the dense treeline across the muddy gap. The thrumming heartbeat of the boar within the guard's chest echoed faintly in the quiet morning air.
"Open it," Arthur commanded.
Two lesser Kobolds, looking incredibly small next to First, strained against the heavy timber locking bar. They pulled it back with a loud clatter and swung the crude gate outward.
Arthur didn't take the entire fighting force. He left thirty-seven Kobolds behind the palisade with strict orders to continue reinforcing the trench. The hunting party consisted solely of himself, First, and three of the most agile, sharp-eyed scavengers to act as porters and trackers. They carried coils of braided vine and crude bone knives strapped to their thighs.
They crossed the muddy choke point and stepped into the violet forest.
The atmosphere changed instantly. The ambient light plummeted as the thick, purple-barked canopy blotted out the shattered moon and the rising sun. The air here was heavy with a cloying, sweet rot; it smelled like overripe fruit mixed with old blood. The flora was distinctly alien: thick ferns pulsed with a faint bioluminescence, and the vines hanging from the high branches looked uncomfortably like thick, swollen veins.
Arthur moved with a careful, calculated gait. His digitigrade legs absorbed the uneven terrain of exposed roots and slippery moss perfectly. He kept his Senses highly attuned, parsing the overwhelming smells and sounds of the alien ecosystem.
First took the vanguard. The Elite Kobold moved with an aggressive, predatory confidence. He didn't carry a rusted spear anymore; he held a massive, jagged femur from the bone pile, wielding it like a heavy mace. His rust-red scales blended seamlessly into the dark shadows of the underbrush.
They trekked in silence for two hours. Arthur was looking for specific biological markers. He didn't want a pack of small, agile creatures; he needed a heavy, dense core to harvest for his own physical evolution. He needed an apex predator.
A sharp, vibrating hiss from First brought the party to a dead halt.
The Elite Kobold raised a clenched fist, his talons gleaming in the dim light. He pointed his heavy bone mace down a steep, fern-choked embankment.
Arthur stepped forward, his eyes narrowing as he peered through the gloom.
The vegetation at the bottom of the embankment was completely flattened. Massive, deep tracks were gouged into the black soil. The footprints were vaguely humanoid but incredibly wide, bearing the deep indentations of long, curved claws that dragged through the dirt with every step.
More concerning was the scent. A pungent, acidic reek wafted up from the trail. It burned the back of Arthur's throat, smelling heavily of gastric acid and dissolved bone.
Arthur checked his interface.
[Notice: High-threat biological footprint detected.]
He nodded to First, motioning for the group to follow the trail. They descended the embankment, moving with agonizing slowness to avoid snapping any of the brittle, bioluminescent ferns.
The tracks led them to a massive clearing dominated by the hollowed-out husk of a fallen, ancient tree. The air here was thick with a yellow, acrid mist.
In the center of the clearing stood the architect of the destruction.
Arthur felt a cold chill radiate outward from his human heart. The creature was a grotesque amalgamation of anatomy that defied all biological logic. It stood nearly eight feet tall, hunched over heavily on thick, pillar-like legs covered in matted, reddish-brown fur. It possessed a single, massive eye set deep into a heavily armored, sloping skull.
But the horror of the beast was not its face. It was its torso.
The creature’s abdomen was split entirely open. A vertical, gaping maw stretched from its sternum down to its pelvis, lined with row upon row of jagged, inward-curving teeth. A thick, corrosive drool spilled from the abdominal mouth, sizzling loudly as it hit the damp forest floor.
[Target Identified: Gore-Maw Mapinguari (Lv. 8)]
[Classification: Mythological Aberration (Amazonian Root).]
[Threat Level: Severe.]
The beast was currently hunched over the remains of a massive, centipede-like creature, using its incredibly long, scythe-like claws to feed chunks of meat directly into the slavering maw on its belly. The jaws crunched through the centipede's carapace with deafening, hydraulic force.
Arthur crouched behind the massive root of a nearby tree. His analytical mind rapidly dissected the target.
A Level 8 mythological aberration. It was heavily armored on the skull and possessed immense upper-body strength. The claws could sheer a Kobold in half with a single swipe. The abdominal mouth was an instant-kill zone; anything caught in those jaws would be digested alive by the acidic bile.
But it was slow. The heavy, lumbering anatomy meant it relied on ambush or overwhelming physical mass to pin its prey.
Arthur looked at First. The Elite guard was trembling, but not from fear. The Iron-Bristle heart in his chest was pounding with a frantic, aggressive rhythm. First wanted the kill.
"We don't fight it head-on," Arthur whispered, signaling the three terrified porters to stay hidden behind the roots.
He looked at his own massive, rust-red legs. He possessed incredible jumping power, but his human arms still lacked the strength to pierce thick armor. He needed to strike a critical, unprotected vulnerability.
Arthur tapped First's shoulder. He pointed to the thick canopy of branches overhanging the clearing, then pointed to the beast's blind spot on its right side.
"You take the ground; break its balance," Arthur commanded, sketching a swift flanking maneuver in the dirt. "I take the sky."
First nodded. The Elite Kobold didn't hesitate; he melted into the thick underbrush with predatory silence. His rust-red scales provided perfect camouflage against the dark, decaying flora of the forest floor.
Arthur took a slow, deep breath to steady his human heart. He looked up at the thick, violet-barked branches crisscrossing twenty feet above the clearing. His human arms lacked the strength to pull him up, but his chimera legs were built for explosive verticality.
He crouched low, his digitigrade heels pressing firmly into the black soil. He focused all his latent power into his calves and launched himself upward. The sheer kinetic force propelled him in a massive, terrifying arc. He crashed into the canopy, his hands scrabbling for purchase, but his scaly feet found a thick branch and locked down instantly. The impact jarred his chest plate violently, but the sub-dermal chitin held.
Below him, the Gore-Maw Mapinguari continued to feast. The hideous, vertical maw in its abdomen snapped shut over a large segment of centipede shell, grinding it into a foul, acidic paste.
This content has been misappropriated from Royal Road; report any instances of this story if found elsewhere.
From the shadows on the beast's right flank, First struck.
The Elite Kobold burst from the ferns like a fired cannonball. He didn't aim for the heavily armored skull or the lethal abdominal mouth. He swung his massive bone mace in a brutal, sweeping arc directly at the Mapinguari’s right knee joint.
The impact sounded like a falling tree. The bone mace shattered against the beast's thick hide, but the blunt force trauma was devastating. The Mapinguari let out a deafening, wet bellow. Its massive, pillar-like leg buckled; the creature crashed hard onto its side, tearing up chunks of black soil.
First immediately rolled backward, narrowly avoiding a desperate, sweeping slash from the beast's scythe-like claws that sheared cleanly through a nearby tree trunk.
The Mapinguari began to push itself up, its single eye wide with primal fury. Its abdominal mouth opened fully, revealing a glowing, bubbling pool of yellow gastric acid preparing to violently expel onto the Kobold.
It was the perfect opening.
Arthur stepped off the branch. He didn't jump; he simply let gravity turn him into a falling projectile. As the wind rushed past his ears, he called upon his magic.
[Initializing Surgeon’s Domain.]
The silver box materialized in the air beside him. Arthur didn't reach for the scalpel this time. He needed reach and severing power. His hand closed around the glowing, serrated grip of the System’s bone saw.
He hit the Mapinguari precisely between its massive, hunched shoulders. His heavily muscled Kobold legs absorbed the horrific impact, driving the beast back down into the dirt.
Before the creature could thrash, Arthur drove the humming, glowing blade of the bone saw directly into the base of its thick neck. He didn't slash wildly; he applied his high Intelligence stat and his anatomical expertise. He bypassed the thickest layers of muscle, sliding the blade perfectly between the cervical vertebrae, and engaged the cutting mechanism.
The saw shrieked as it bit into the bone and spinal cord. The Mapinguari’s massive body violently seized. The abdominal mouth snapped shut with a resounding crunch, biting its own slavering tongue in half, and the glowing pool of acid spilled harmlessly onto the soil beneath it.
Arthur pulled the blade free and stepped off the twitching corpse, his chest heaving. The sheer size of the beast made the clearing feel incredibly small.
[Notice: Gore-Maw Mapinguari (Lv. 8) killed.]
[Experience gained. Level Up!]
[Host is now Level 3. 5 Stat Points awarded.]
Arthur dismissed the prompts with a flick of his blood-stained hand. He kept the Surgeon’s Domain active, watching his Stamina bar closely. He turned his attention to the true prize.
A Level 8 mythological aberration possessed biology that could elevate his entire tribe, but he was specifically looking for a way to fix his own frail upper body.
He knelt beside the colossal corpse. The reek of the acid was overpowering, forcing him to breathe shallowly through his mouth. He used the glowing bone saw to carefully pry open the dead creature's arm, avoiding the sizzling pools of gastric fluid leaking into the dirt.
[Notice: Viable biological material harvested: Mapinguari Acid Gland.]
[Notice: Viable biological material harvested: Mapinguari Dense-Muscle Fibers (Forearms).]
[Notice: Viable biological material harvested: Mapinguari Single-Eye Core.]
Arthur stared at the massive, muscular forearms of the beast. The fibers were so dense they looked like woven steel cables. If he could graft that musculature directly into his own human arms, he wouldn't just be able to swing a weapon; he would be able to tear a lesser monster apart with his bare hands.
First stepped cautiously into the clearing, eyeing the massive corpse with deep reverence. The three lesser Kobold porters emerged from the ferns a moment later, their jaws dropping at the sheer scale of the kill.
"Secure the perimeter," Arthur commanded. He pointed a bloody finger at First. "We harvest everything we can carry; the rest goes into the acid."
It was time for the Surgeon to upgrade his own arsenal.
The stench of the clearing was horrific; the Mapinguari’s spilled gastric acid hissed violently as it dissolved the black soil and the shattered remnants of the centipede. Arthur ignored the burning sensation in his throat. He had a brief window of safety before the scent of a Level 8 carcass drew every scavenger in the violet forest.
He opened his interface, eyeing the five unallocated stat points from his recent level up. Complex field surgery on his own upper extremities required absolute, unwavering precision. A single severed nerve could render his hands useless, permanently ending his life as a surgeon.
He mentally allocated the points.
Allocate 3 points to Dexterity.
Allocate 2 points to Intelligence.
The familiar blast of cognitive clarity washed over him. His mind sharpened to a razor's edge, cataloging every anatomical detail of the massive beast before him. His hands, still stained with dark blood, felt lighter and unnaturally steady. His Dexterity was now 15; his Intelligence was 17. He was ready.
"Watch the trees," Arthur ordered First. The Elite guard rumbled an acknowledgment, hefting his bone mace and scanning the dark canopy. The three lesser porters huddled nervously near the perimeter, their bone knives drawn.
Arthur knelt in the damp soil. He reached into the air and called upon his magic.
[Initializing Surgeon’s Domain.]
[Current Stamina: 100/100. (Restored via Level Up)]
The sterile silver box materialized. Arthur retrieved the glowing scalpel and a spool of the blue suture thread. He laid the thick, cable-like strands of the Mapinguari’s dense-muscle fibers across his scaly knees. The aberration's tissue was incredibly heavy, pulsing with a faint, latent heat.
He started with his left arm.
Rolling up his ruined sleeve, Arthur pressed the scalpel against his inner elbow, right at the antecubital fossa. He dragged the blade straight down to his wrist. The pain was immediate, sharp and blinding, but the System's magic prevented the blood from obscuring his vision.
He used the retractors to pull the skin and subcutaneous fat aside, fully exposing the complex musculature of his human forearm.
Arthur’s enhanced Intelligence processed the intricate network of the brachioradialis, the flexor carpi radialis, and the delicate tendons controlling his fingers. He didn't want to replace his human muscles entirely; he needed to retain his surgical dexterity. Instead, he planned to interweave the aberration's dense fibers alongside his own, creating a hybrid muscular structure capable of immense kinetic force.
He picked up the first strand of the dark red, cable-like Mapinguari muscle.
Using the scalpel, he carefully split the fascia surrounding his own flexor muscles. He laid the heavy alien fiber directly into the groove, then grabbed the glowing blue thread. This was not a simple stitch. He had to rapidly bind the aberration's tissue to his own blood vessels and nerve endings, forcing his human biology to adopt the foreign powerhouse.
The blue light flared brightly in the gloomy clearing. Arthur gritted his teeth, sweat stinging his eyes as his stamina began to steadily drain. He worked the needle with terrifying, mechanical speed. Every time the blue thread fused the tissues, a jolt of raw, hot electricity shot up his arm and into his chest.
He repeated the process three times on his left arm, burying the dense fibers deep beneath his skin. Then, fighting through the creeping exhaustion, he moved to his right arm.
The surgical trauma was immense. His forearms swelled grotesquely as the human skin was forced to accommodate the massive influx of dense muscle. The veins bulging against his wrists turned a faint, bruised purple.
[Current Stamina: 20/100.]
Arthur tied the final knot on his right wrist and collapsed the retractors. He rapidly sutured both long incisions closed. The blue magic sank into his flesh, leaving behind two jagged, angry pink scars running from his elbows to his palms.
The silver box vanished. The blue screens shattered and reformed.
[Quest Complete: Muscular Augmentation.]
[Integration Rate: 94%.]
[Host Race Updated: Human (Chimera Variant - Stage 3).]
[Reward: +8 Strength. New Passive Skill: Aberrant Grip (Lv. 1).]
Arthur dropped his head back, gasping for air. His arms felt like they were on fire, but the underlying sensation was completely intoxicating. The frailty of his human upper body was gone. His forearms were now disproportionately thick, corded with dense, unnatural muscle that thrummed with the captured kinetic energy of the Level 8 aberration.
He pushed himself up from the dirt using only his hands. The sheer ease of the movement was staggering. His Aberrant Grip allowed his fingers to dig straight into the packed black soil like iron pitons.
He looked at First. "Strip the armor. We take the acid gland, the eye, and the prime meat."
The Elite Kobold immediately moved to the carcass, his heavy talons tearing into the Mapinguari’s flesh. Arthur joined him. He grabbed a massive, jagged plate of bone armor protecting the beast's shoulder. Before the surgery, it would have taken a pry bar to shift it. Now, Arthur dug his fingers under the edge, braced his rust-red legs, and simply ripped the heavy plate free with a sickening crunch.
The three porters rushed forward with their coils of braided vine, quickly binding the harvested meat and the valuable, basketball-sized Single-Eye Core.
As they cleared the carcass, Arthur noticed something strange beneath the beast. The Mapinguari hadn't just been eating the centipede; it had been digging.
Arthur stepped into the shallow crater the monster had excavated. The soil here was different. It wasn't the soft, black rot of the forest floor. It was hard, rocky, and laced with thick veins of a glowing, pale blue mineral.
He crouched down, running a newly strengthened hand over the exposed rock. The mineral hummed against his skin, vibrating with a cold, clean energy that felt entirely different from the brutal, biological magic of the System.
[Resource Discovered: Raw Mana-Iron Vein.]
[Purity: Medium.]
Arthur’s eyes widened. A kingdom couldn't survive on bone knives and woven vines forever. To build a true civilization, they needed metallurgy. They needed forges, tools, and weapons that wouldn't shatter against the hide of a Monarch. The Mapinguari hadn't just provided him with physical strength; it had died right on top of the exact industrial resource Arthur needed to trigger a technological revolution for the Ravine Outpost.
He chipped a jagged piece of the blue-veined ore loose and stood up, slipping the heavy stone into his pocket.
"Load up," Arthur commanded, his voice ringing with a new, dark authority. "We are going to need better tools. The Iron Age starts tomorrow."
That’s a wrap on the first five chapters of Body Builder!
The Schedule: I’m officially moving to a 2-chapters-per-day release schedule to keep Arthur’s evolution moving at high speed. Since I'm balancing this with my 2nd year of Mechanical Engineering, I'm aiming for consistent, daily progress.
The Algorithm: If you enjoyed this opening burst, please hit Follow or leave a Rating. As a new author, your early engagement is the only way the algorithm knows to keep pushing this story to others.
See you tomorrow morning for Chapter 6!
