Not spooky. Not cursed. Not haunted.
Just… built for people, used by something else.
Pipes ran along the ceiling like metal veins. Damp stone walls sweated constantly. The blue glow was faint here, but it was everywhere, like a stain that would not scrub out.
Roth led. Lyra walked at his shoulder. Mina behind them. Me behind Mina, because nobody wanted the healer to get jumped from the rear.
I kept my sword up and tried not to look at my boot.
The sole was half melted from the jump onto the boss slime. Mina had cooled the burn, but the boot still felt like it was made of bad decisions.
Then my inventory pinged again, like the system was tapping me on the forehead.
[CRAFTING AVAILABLE]
Basic Reinforcement
Materials: Slimeproof Resin (1)
Target: Boots or Gloves
Result: Acid Resistance (Minor), Durability +20%
Success Rate: 92%
Lyra saw my eyes flick.
“Do not tell me you are crafting in the sewer,” she said.
“I am crafting in the sewer,” I whispered back.
Roth did not turn his head. “Do it while moving. Fast.”
So I did.
I opened my inventory while walking. It felt like trying to read a menu while sprinting down stairs, but the system helped. The blue window snapped everything into neat boxes.
Slimeproof Resin appeared as a small jar of gray paste.
I selected my boot as the target.
[CRAFTING CONFIRMATION]
Apply Slimeproof Resin to: Leather Boots (Damaged)
Proceed? Y/N
Yes.
The resin vanished from my inventory and appeared in my hands like it was teleported. Cool. Great. Terrifying. I smeared it on the boot with my fingers while walking. It was cold, sticky, and smelled like wet clay.
A chime.
[CRAFTING SUCCESS]
Leather Boots reinforced.
Effect: Acid Resistance (Minor)
Durability: 72 / 120
I felt the boot tighten slightly like the leather had remembered it was supposed to exist.
Dopamine hit.
Lyra clicked her tongue. “Unreal.”
Mina glanced back. “Good. You need your feet.”
Roth’s voice stayed calm. “Quiet. Sound ahead.”
I shut up instantly.
Because he was right.
Up ahead, beyond the next bend, the wet sound returned.
Not a gurgle like a normal slime.
More like a rhythmic drip.
Drip. Drip. Drip.
Like a faucet. Like a heartbeat.
We turned the corner.
The corridor widened into a maintenance passage with a shallow channel cut into the floor for water runoff.
The channel was glowing faint blue.
And in the center of the channel was a lump that looked like jelly fused to metal.
It was stuck to the stone like a leech.
Small. Unimpressive.
But the blue glow pulsed from it in steady beats.
My quest window flashed.
[OBJECTIVE UPDATED]
Contain outbreak: Progress
Eliminate source: Nearby
Warning: Spawner detected
Lyra whispered, “That thing is feeding them.”
The lump twitched. A bubble rose in its surface, then popped, and a small slime crawled out of it like a newborn.
The slime looked around.
Then it saw us.
Then it launched itself at our ankles.
Roth stabbed down and killed it cleanly.
[PARTY KILL RECORDED]
Slime spawn slain. EXP +14
Another bubble formed.
Another spawn.
Lyra’s fingers lit. She flicked fire. The spawn died.
[PARTY KILL RECORDED]
Slime spawn slain. EXP +14
The lump pulsed faster.
Drip. Drip. Drip.
More bubbles. More slimes.
Mina’s voice tightened. “It will keep producing.”
Roth stepped forward and raised his shield.
Lyra grabbed his shoulder. “Do not touch it with the shield. It will eat it.”
Roth paused, then looked at me. “Kenta. Appraise.”
I focused on the lump.
[APPRAISAL]
Bloom Leech (Uncommon)
Type: Slime Parasite
Function: Produces minor slimes, leaks corrosive mana into water system
Weakness: Fire, Holy
Note: Linked to: Floodgate Heart (Unknown)
Floodgate Heart.
That sounded like the thing we were already looking for, just said in a more dramatic way.
“Huh,” I muttered. “It is linked to something called Floodgate Heart.”
Lyra frowned. “Of course it is.”
Roth moved without hesitation. “Burn it.”
Lyra planted her feet and sent a concentrated flame into the leech. It shrieked, a high wet sound like boiling glue. The blue glow flared, then flickered.
Mina raised her symbol and spoke a short prayer. Light snapped into the leech like a spear.
The leech convulsed.
I stepped in and stabbed straight down, careful to keep my blade in and out quickly, minimal splash.
The leech split, but it did not become two. It just collapsed.
The channel stopped glowing for a second.
Then the glow returned, still faint.
The system chimed.
[TARGET ELIMINATED]
Bloom Leech destroyed.
EXP +60
Loot: Slime Residue (Common)
Lyra pointed at the channel.
You might be reading a pirated copy. Look for the official release to support the author.
“Glow is still there,” she said. “So this is not the heart.”
Roth nodded. “Keep moving.”
We did.
Two more leeches appeared in the next stretch, then another. Each one linked to Floodgate Heart. Each one producing slimes. Each one a small fight that felt like swatting insects while standing in poison.
My sword got faster. My parry timing got cleaner. My fear stopped getting a vote.
The system loved it.
[LEVEL UP]
Level 12
Stat Points +5
Lyra saw my plate update and rolled her eyes so hard it looked painful.
“You are going to reach level fifty in a week and become the most annoying person in the kingdom.”
“Noted,” I panted, stabbing a spawn. “I will try to be humble about it.”
“You will fail,” she said.
Roth stopped at an iron door embedded in the stone.
Big. Old. The kind of door that existed to keep something contained.
A wheel handle sat at the center. Rust caked it.
A faded symbol was carved above the frame.
A circle of stars around a tear shaped gem.
Church symbol.
Mina’s gaze tightened.
Lyra’s voice went flat. “Why is the church symbol in the sewer.”
Roth held out his hand. “Key.”
I pulled the rusted gate key from my inventory and placed it in his palm.
The key was colder than it should have been.
Roth slid it into the lock.
It fit perfectly.
Metal clicked.
The door did not open.
Roth grabbed the wheel handle and turned.
It resisted, then moved with a grinding scream.
The system pinged.
[QUEST ITEM USED]
Rusted Gate Key
Floodgate Control access: Unlocked
The door groaned.
Then something behind it made a wet, eager sound.
Not a slime gurgle.
A deeper suction noise, like something drinking.
Lyra’s fingers ignited. Mina’s light rose. Roth pushed the door open slowly.
The smell hit like a punch.
Not sewage.
Not rot.
Metal. Damp stone. And something sharp and clean like a storm.
The room beyond was a control chamber.
Old machinery. Gears. Levers. A central valve wheel the size of a wagon. Pipes running into the walls like arteries.
And in the center of it all, bolted to the main valve assembly, was a mass of glowing blue growth.
Not slime exactly.
It looked like crystal and jelly had tried to merge and failed.
It pulsed with the same drip heartbeat we had been hearing.
Drip. Drip. Drip.
The water in the pipes glowed.
And hanging from the growth were tendrils, thin as cords, feeding into cracks in the floor like roots.
Lyra whispered, “That is disgusting.”
Mina swallowed. “That is not natural.”
Roth stepped into the room.
The moment he crossed the threshold, the growth pulsed hard.
Three slimes dropped from the ceiling like they had been waiting.
Not small ones.
These were thick, bright, and angry.
My vision flashed.
[ENEMY DETECTED]
Gate Slime (Enhanced) x3
Level: 10
Traits: Acid, Split on blunt force
Roth barked, “Same rules. Stab. No heavy slashes.”
Lyra nodded, already moving. Mina raised her symbol. I tightened my grip and stepped forward.
The first slime surged at Roth’s shield.
Roth sidestepped and stabbed, then scraped his blade on stone.
The second slime came at my knees.
Parry. Angle. Deflect.
I stabbed into its core and twisted slightly, then pulled out fast.
It shuddered and collapsed.
[KILL RECORDED]
Gate Slime slain. EXP +30
The third slime tried to slide around Mina’s barrier and hit her ankle.
Lyra incinerated it with a sharp fire bolt.
[PARTY KILL RECORDED]
Gate Slime slain. EXP +24
Roth finished the last one.
Silence returned for half a second.
Then the growth in the center pulsed again.
A wet sound. A drip.
A new slime formed directly out of the blue mass and dropped to the floor.
Lyra’s mouth tightened. “It is making them in real time.”
Mina’s eyes fixed on the growth. “We must destroy it.”
Roth stepped toward the central valve assembly.
The air around it felt colder. The glow was brighter up close.
I raised my Appraisal again, focusing hard.
[APPRAISAL]
Floodgate Heart (Rare)
Type: Mana Contaminant Node
Function: Injects corrosive mana into water network
Creates: Enhanced slimes
Weakness: Fire, Holy
Warning: Destroying node may destabilize seal
Authority Tag: ??? (Unreadable)
Unreadable.
That was new.
My skin prickled.
“Mina,” I said, “Appraisal says destroying it may destabilize a seal.”
Mina’s face tightened. “Seal of what.”
Lyra glanced at the church symbol above the door. “A seal of the church, apparently.”
Roth’s jaw clenched. “We end the threat first. Then we handle consequences.”
That was a soldier answer. It did not help my stomach.
The Floodgate Heart pulsed again.
This time it did not make one slime.
It made five.
My vision flashed red.
[WAVE EVENT]
Floodgate Heart is spawning defenders.
Defeat wave to expose core.
Lyra exhaled sharply. “Okay. It is a dungeon now.”
Roth lifted his shield. “Hold formation.”
The slimes surged.
We fought in tight space, blades and flame and light.
No room to run. No room to breathe.
My reinforced boot saved me when acid splashed near my feet. It still burned, but it did not melt through instantly.
That tiny upgrade felt like survival itself.
Dopamine hit again when Parry leveled.
[SKILL LEVEL UP]
Parry (Lv. 2)
Damage mitigated increased.
I parried a slime that would have hit Mina, deflected it into Lyra’s flame, and it died mid air.
[KILL RECORDED]
Gate Slime slain. EXP +30
Roth stabbed with brutal control. Lyra fired flame like a machine. Mina’s light hit like a hammer.
Wave cleared.
The Floodgate Heart pulsed, then hesitated for the first time.
The blue glow dimmed slightly.
A core became visible inside the mass, a bright knot like a heart made of glass.
My system chimed.
[CORE EXPOSED]
Floodgate Heart core vulnerable for 20 seconds.
Roth shouted, “Now.”
Lyra dumped fire into it.
The core hissed. Cracks spidered across it.
Mina slammed holy light into it.
The cracks widened.
I sprinted forward, ignoring the heat, and drove my sword into the cracked core like I was stabbing a gemstone.
The blade hit something hard.
My arms jolted.
Then the core shattered.
Blue light exploded outward like a flashbang.
My vision went white.
The system screamed warnings across my sight.
[WARNING]
Seal destabilizing.
Water network pressure fluctuating.
Corrosive mana discharge.
Then I heard it.
A deep groan from the machinery.
The huge valve wheel began turning on its own, slowly, like something was releasing.
Pipes rattled. Water surged.
A gout of glowing blue water blasted from a cracked pipe and splashed across the floor.
Stone hissed.
Lyra cursed. “Mina!”
Mina stepped forward and threw up a barrier, a wide sheet of light that caught the spray and redirected it into the drainage channel.
Her face went pale instantly.
Roth grabbed the valve wheel and forced it the other direction, muscles straining.
“Kenta,” he snapped. “Help.”
I shoved my hands onto the wheel.
It was slick with condensation and faint slime residue. It felt like turning a giant rusted coin with your life hanging off it.
We pushed.
The wheel resisted, then moved.
The pipe pressure eased.
The glow in the water faded.
The room stopped shaking.
My lungs finally remembered how to work.
The system chimed, bright and loud.
[BOSS DEFEATED]
Floodgate Heart destroyed.
Sewer Bloom contained.
EXP +2,500
Level Up! Level 14
Stat Points +15
Title Earned: Bloombreaker (I)
Loot Acquired: Blue Core Shard (Rare)
Loot Acquired: Seal Dust (Uncommon)
Loot Acquired: Slimeproof Resin x2 (Common)
Level fourteen.
My knees went weak.
Lyra stared at my plate glow and whispered, “You are actually a menace.”
Roth released the wheel slowly and leaned on it for a second, breathing hard.
Mina lowered her barrier and swayed.
I caught her elbow before she fell.
“You are overextending,” I said, voice rough.
She forced a small smile. “Yes.”
Lyra stepped toward the shattered core remains and poked a fragment with her staff.
The fragment did not melt. It did not dissolve. It just sat there, glittering faintly blue.
“Not normal slime,” she muttered.
I lifted the Blue Core Shard from my inventory and appraised it.
[APPRAISAL]
Blue Core Shard (Rare)
Type: Mana Crystal Fragment
Properties: Corrosive mana, high purity
Note: Origin data blocked.
Authority: DIVINE
Divine.
That word made my stomach twist again.
Not panic. Not revelation.
Just… weird.
“Huh,” I said quietly. “Origin is blocked. It says Authority divine.”
Lyra’s eyes narrowed. “That is not a thing objects should say.”
Mina looked at the church symbol over the door. “The church seals the floodgates during plagues. It is old doctrine.”
Roth’s voice was flat. “Doctrine does not make blue crystal cancer in the sewer.”
Lyra snorted. “Best line you have said all week, Captain.”
Roth ignored her.
A faint click sounded from the machinery.
A small panel on the wall slid open, as if the system of this place had recognized the core was gone and decided to reveal a maintenance compartment.
Inside was a stamped metal plate with faded writing.
Mina leaned in. “What does it say.”
It was in the local language. Auto translation helped, but my eyes still had to focus.
The plate read:
“Floodgate Control Room. Sealed by Order of the Star. Unauthorized access forbidden.”
Order of the Star.
The church’s formal name.
Under it, in smaller text, almost scratched out, was a second line.
“Seal integrity check every 30 days.”
Roth’s eyes narrowed. “So someone was supposed to monitor this.”
Lyra’s voice was colder. “And they did not.”
Mina’s shoulders tensed. “Or they did, and this still happened.”
The idea hung in the damp air.
My quest window updated again.
[EMERGENCY QUEST COMPLETE]
Sewer Bloom contained
Civilians rescued: 3/3
Bonus achieved
Return to Guild for reward and report.
The dopamine urge hit hard.
Return. Turn in. Get rewards. Get stronger.
But my eyes kept flicking to the Blue Core Shard in my inventory.
Authority divine.
That was not supposed to mean anything to me.
It still felt like stepping on a nail you only noticed after the pain.
We left the control room with the key still in Roth’s hand.
The corridors behind us were quieter now.
No new slimes. No new glow. The dripping heartbeat was gone.
The sewer felt like it was exhaling.
When we reached the stairwell behind the bakery, the sound of the city hit us like a wave.
Voices. Running feet. Guards shouting. People crying.
Roth pushed the door open and we emerged into torchlight and panic.
A guard captain rushed over. “Captain Roth. Report.”
Roth held up the Blue Core Shard in his palm so the torchlight caught it.
“Source destroyed,” he said. “Outbreak contained. Floodgate control room was compromised.”
The guard captain stared at the shard like it was a curse.
Lyra muttered, “So are we done.”
Mina looked at me. “Are you hurt.”
I flexed my burned leg. “Not worse.”
My Hero Plate warmed again, projecting my level in crisp blue.
Fourteen.
People saw it.
A hush spread.
Then whispers.
“The Hero.”
“He is really leveling.”
“He went into the sewers and came out alive.”
I wanted to sit down. I wanted food. I wanted to open my stat menu and slam points until I became a wall.
Instead I stood there, breathing, cloak damp, sword stained, boots reinforced.
Roth looked at the guild direction.
“We report. We collect reward. Then we sleep.”
Lyra nodded. “Then we take another quest and become poor again.”
Mina’s smile was tired. “Then we keep going.”
I took one more breath and followed them into the night.
The system was already glowing at the edge of my vision, eager and patient.
And in my inventory, the Blue Core Shard sat like a tiny, quiet question that refused to go away.
Not a conspiracy.
Not a prophecy.
Just a small thought with no place to put it yet.
Weird.