The Plumber

Real Name: Elias “Pipes” Mercer
Occupation: Wasteland water engineer, tunnel explorer, trap-maker, and reluctant community protector
Known As: The Plumber
Faction Status: Independent, though several settlements, raider gangs, and major factions want control of him
Possible Role: Companion, settlement specialist, recurring NPC, or regional questline character

The Plumber is not merely someone who repairs sinks. In the wasteland, he is one of the few people capable of understanding the forgotten network of water mains, sewage tunnels, storm drains, pumping stations, underground reservoirs, and municipal maintenance passages buried beneath the ruins.

He knows that whoever controls the pipes controls the region.

Appearance

The Plumber wears a patched municipal utility uniform beneath a heavy rubberized work coat. His equipment includes:

Reinforced waders made from scavenged hazmat material
A dented maintenance helmet with a working headlamp
Thick insulated gloves
A large circular valve wheel strapped to his backpack
Pipe fittings, pressure gauges, filters, and tools hanging from his belt
A homemade respirator for sewer gases and underground spores
A Pip-Boy-like utility scanner built from an old water-pressure diagnostic device

His backpack contains a compact filtration system and several transparent tubes filled with liquids of different colors. Some are clean water samples. Others are corrosive chemicals, irradiated sludge, industrial coolant, or substances he refuses to explain.

His signature weapon is an oversized pipe wrench called The Final Adjustment.

Background

Before the war, Elias Mercer’s family had worked for the city’s water department for generations. His great-grandfather had access to restricted infrastructure maps showing maintenance tunnels that did not appear on public records.

Those maps survived in a sealed municipal archive.

Elias discovered them as a teenager while scavenging beneath an abandoned pumping station. He learned that the city underneath the city was still partially operational. Ancient pumps continued moving water through broken pipes. Automated purification facilities remained active. Emergency reservoirs had never been opened. Some tunnels connected government bunkers, hospitals, subway systems, military sites, factories, and wealthy pre-war neighborhoods.

Elias spent decades mapping the underground network.

He became known as The Plumber after saving a settlement whose contaminated well was killing its residents. Rather than treating the water, he traveled six miles underground, repaired an intake valve, redirected an old municipal line, and restored clean water to the entire community.

The settlement offered him leadership.

He asked for copper tubing, three pressure gauges, and a hot meal.

Then he disappeared back underground.

Personality

The Plumber is intelligent, practical, suspicious, and unusually calm in dangerous situations. He speaks about communities the way other people discuss plumbing systems.

“Every settlement leaks. Water, food, ammunition, trust. Find the leak before the pressure drops.”

He believes civilization is not rebuilt through flags, speeches, or armies. It is rebuilt through infrastructure.

He dislikes politicians, faction leaders, and anyone who promises to “save the wasteland” without understanding where drinking water comes from.

He can be compassionate, but he has an unsettling willingness to sacrifice one community to protect several others. To him, survival sometimes becomes an equation of pressure, supply, and population.

Character Traits

Highly observant
Methodical under pressure
Protective of children and struggling settlements
Distrustful of major factions
Fascinated by functioning pre-war machinery
Deep fear of drowning or becoming trapped underground
Hates unnecessary waste
Treats robots more respectfully than most politicians

The Plumber’s Territory

The Plumber operates from a hidden underground workshop called The Junction.

It sits where several major municipal lines intersect beneath the city. The location contains:

A functioning water purification system
Underground hydroponic gardens
A workshop built around an enormous pressure-control station
Maps covering hundreds of miles of pipes and tunnels
Captured mirelurks used to test water toxicity
Small maintenance robots modified to inspect narrow pipes
Emergency floodgates capable of sealing entire districts
A hidden reservoir containing millions of gallons of purified water

Several factions search for The Junction, but The Plumber deliberately spreads false maps and misleading tunnel markings.

Some routes lead treasure hunters into dead ends.

Others lead them into flooded chambers, feral ghoul nests, or pressure traps.

Signature Weapons

The Final Adjustment

A heavily modified pipe wrench reinforced with hydraulic components.

Possible Modifications

Pressure Piston: Adds a mechanical impact to each swing
Valve Breaker: Increased damage against robots, armor, and turrets
Heated Grip: Channels steam through the wrench head
Corrosive Coating: Applies acid damage
Magnetic Clamp: Briefly disarms enemies carrying metal weapons

Its unique critical animation can lock onto an enemy’s armor, weapon, or limb before applying a violent hydraulic twist.

Pressure Lance

A rifle-like weapon assembled from pipes, compressor tanks, and industrial valves.

It fires concentrated blasts of:

High-pressure water
Steam
Irradiated sludge
Acidic cleaning chemicals
Freezing coolant
Flammable industrial residue

Different liquids create different effects. Water can stagger enemies and damage electrical systems. Steam burns through armor. Coolant slows targets. Sludge spreads radiation.

The Drain Snake

A motorized cable weapon used like a flexible spear or industrial whip.

It can:

Strike enemies around shields
Pull weapons from their hands
Entangle legs
Reach enemies through narrow openings
Clear biological growth from pipes
Activate distant valves and switches

Upgrades can add serrated edges, electrical current, or an explosive cutting head.

Pipe Bomb Network

The Plumber’s pipe bombs are not ordinary explosives. He can connect them to old utility lines and remotely trigger a chain reaction.

Possible effects include:

Bursting steam mains beneath enemies
Flooding rooms
Igniting natural gas
Releasing toxic sewer vapor
Blasting manhole covers into the air
Collapsing weakened tunnels
Redirecting contaminated water into enemy territory

Unique Gameplay System: Infrastructure Control

Meeting The Plumber unlocks the Infrastructure Network system.

The player can discover and repair municipal systems throughout the wasteland.

Repairable Systems

Water mains
Sewage treatment plants
Storm drains
Hydroelectric turbines
Pumping stations
Fire-suppression systems
Underground reservoirs
Industrial coolant networks
Emergency shelter pipelines
Agricultural irrigation channels

Repairing these systems changes the world instead of merely producing resources at a settlement.

For example:

A restored water line allows a settlement to expand
Draining a flooded tunnel opens a new dungeon
Repairing a sewer system reduces disease
Redirecting runoff creates farmland
Restoring fire hydrants gives settlers emergency defenses
Cutting a water supply weakens an enemy faction
Flooding a raider base forces survivors to relocate
Repairing a treatment facility slowly cleans a radioactive river

Infrastructure decisions can create long-term benefits and unintended consequences.

Main Questline: Pressure Below

The Plumber discovers that pressure is rapidly increasing throughout the underground water network. Pipes are rupturing, tunnels are flooding, and settlements are reporting contaminated water.

Someone has activated an ancient system known as the Municipal Continuity Grid.

The grid was built before the war to give government authorities complete control over water distribution during a national emergency. It can remotely reroute water, seal districts, poison reservoirs, flood tunnels, and cut off entire communities.

Three groups are competing for control.

The Purifiers

A religious settlement movement that believes all contaminated water must be destroyed, even when communities depend on it.

They want to purge the system and establish strict control over the remaining clean reservoirs.

The Deep Union

A civilization of underground workers, ghouls, scavengers, and tunnel families who believe surface communities have wasted water for generations.

They want to shut off the surface and create a permanent subterranean nation.

The Aqueduct Authority

A militarized faction descended from water-department emergency personnel.

They believe water should be rationed according to productivity, loyalty, and strategic importance.

The Plumber opposes all three, but he is hiding something: years earlier, he secretly activated part of the network to save several settlements during a drought. That decision diverted water away from another district, causing hundreds of people to abandon their homes.

Some did not survive.

Major Quest Stages

1. A Leak in the World

The player encounters The Plumber repairing a ruptured main while mutants attack from both sides of a flooded street.

He refuses to leave until the pipe is sealed because the water supplies three nearby settlements.

The player can defend him, repair the pipe independently, steal his tools, or redirect the water elsewhere.

2. Down the Drain

The Plumber leads the player into the sewer network.

The player encounters:

Feral ghouls wearing municipal uniforms
Albino tunnel mirelurks
Mutated lampreys living inside pipes
Maintenance robots still issuing citations
Raiders who travel beneath settlements through drains
Colonies living in dry sections of the sewer
Pre-war skeletons trapped behind emergency flood doors

3. The Dead Reservoir

The player discovers a reservoir that appears empty but contains a hidden settlement built inside the enormous tank.

Its residents survive by collecting condensation and fear that restoring the reservoir will drown their home.

The player must decide whether to preserve the settlement or refill the reservoir to provide water for thousands.

4. Pressure Test

A major faction attempts to capture The Plumber.

The player may rescue him, betray him, impersonate him, or convince him to cooperate.

Without him, the player must solve the network using terminal records, engineering skill, or recruited specialists.

5. Every Drop

The final mission occurs inside the Municipal Continuity Control Center as multiple factions invade through different tunnel systems.

The player decides who controls the regional water network.

Possible Endings

The Plumber’s Network

The Plumber creates an independent water council. Settlements receive water, but each must contribute labor, equipment, or security.

Infrastructure gradually improves across the region.

Free Flow

The player destroys the central controls so no faction can monopolize the network. Local communities gain independence, but the system becomes harder to maintain.

Some settlements thrive. Others suffer catastrophic failures.

Faction Control

The player gives the network to a major faction. Water becomes reliable in loyal territories but can be used as a weapon against opponents.

The Underground Nation

Surface water is severely restricted, allowing the Deep Union to expand beneath the region.

New underground cities appear, but surface settlements begin fighting over wells and rainfall.

Burn the Maps

The player destroys the control center, seals the major reservoirs, and eliminates the possibility of regional control.

The Plumber considers this unforgivable.

Become the Water Baron

The player takes control personally and can demand caps, supplies, allegiance, recruits, or political concessions from settlements.

This can establish the player as one of the most powerful figures in the wasteland.

Companion Version

The Plumber can become a companion after the player earns his trust.

Companion Perk: Know the Pipes

While The Plumber is traveling with the player:

Hidden maintenance entrances appear on the map
The player gains increased resistance to poison and radiation from water
Water sources can be tested before drinking
Mechanical traps are easier to detect
Industrial valves can be used as environmental weapons
Settlements consume less water
Plumbing and water-production objects cost fewer materials

Companion Ability: Release the Pressure

Once per combat encounter, The Plumber identifies a nearby pipe, tank, hydrant, boiler, radiator, or industrial system and weaponizes it.

Depending on the environment, he may:

Create a steam blast
Flood the floor
Electrify standing water
Release coolant
Produce a smoke screen
Knock enemies down with pressurized water

Companion Approval

The Plumber approves when the player:

Repairs infrastructure
Helps poor settlements
Avoids wasting purified water
Solves problems through engineering
Protects workers
Refuses faction monopolies
Gives practical assistance instead of empty promises

He disapproves when the player:

Poisons water supplies without justification
Destroys functioning machinery
Extorts desperate settlements
Wastes resources
Sides blindly with powerful factions
Contaminates clean land
Treats workers as disposable

Personal Quest: The Last Drop

The Plumber receives an old emergency broadcast from a sealed pumping station where his former apprentice disappeared years ago.

Inside, the player discovers that the apprentice survived and has become the leader of a hidden community.

The apprentice claims The Plumber abandoned them when he redirected the district’s water.

The Plumber insists he saved thousands by sacrificing hundreds.

The player can:

Reconcile them
Convince the apprentice to join The Junction
Expose The Plumber’s actions publicly
Defend his decision
Turn the apprentice against him
Replace The Plumber with his apprentice
Force both to share control of the water network

This quest determines whether The Plumber becomes more compassionate, more authoritarian, or leaves the player permanently.

Settlement Role

When assigned to a settlement, The Plumber becomes a Regional Infrastructure Specialist.

He can construct unique systems:

Municipal Water Hub

Connects several allied settlements to one water network.

Underground Supply Line

Allows resources to travel through tunnels, reducing caravan attacks.

Emergency Fire System

Settlers activate hydrants and sprinklers during raids.

Waste Recycling Plant

Converts sewage, spoiled food, and organic waste into fertilizer, fuel, and crafting chemicals.

Pressure Defense Grid

Buried pipes release steam, water, or chemicals when enemies cross settlement boundaries.

Tunnel Access Station

Creates a fast-travel route between connected settlements.

Enemies Connected to The Plumber

Cloggers

Raiders who intentionally block water lines and demand payment to reopen them.

They use:

Hardened sludge armor
Drain-hook weapons
Toxic waste bombs
Sewage sprayers
Captured maintenance robots

Pipe Crawlers

Long, pale mutants that squeeze through drainage lines and burst from sinks, toilets, culverts, and broken hydrants.

Pressure Ghouls

Ghouls mutated inside steam tunnels. Their swollen bodies rupture when killed, releasing boiling vapor.

The Fatberg

A massive sewer mutation made from grease, chemicals, corpses, plastic, and radioactive waste.

It slowly moves through the underground network, blocking pipes and absorbing anything it reaches.

The Plumber believes it may eventually contaminate every reservoir in the region.

Rumors About The Plumber

Wastelanders tell contradictory stories about him:

He can hear water moving through concrete
He drowned an entire raider army without firing a shot
He lives inside the pipes
He has never consumed irradiated water
He knows of a reservoir large enough to supply the wasteland for a century
He secretly controls every settlement well
He is not one man but a title passed between engineers
His workshop contains a device capable of making ocean water drinkable
He once repaired a Vault’s plumbing, then sealed the residents inside after discovering what they had done

Some rumors are exaggerated.

Several are true.

Memorable Dialogue

“People think caps run the wasteland. Turn off their water for three days and see what they start trading.”

“A pipe doesn’t care about your flag. Pressure goes where pressure can.”

“Civilization didn’t die when the bombs fell. It died when nobody remembered how to fix anything.”

“Clean water is never free. Someone crawled through hell to keep it flowing.”

“You see a sewer. I see roads, shelter, power, food, and ten thousand ways to kill somebody.”

“The surface has generals. Underground, we have valves.”

The Plumber would work especially well as a character who initially seems humorous, but gradually becomes one of the most strategically important people in Fallout 5. His story could introduce a full underground infrastructure layer where water, sewage, flooding, irrigation, tunnels, and pressure systems physically transform the wasteland.

The Plumber: Expanded Fallout 5 Character Concept

The Plumber should become more than a quirky wasteland repairman. He should be a regional power broker whose weapons, knowledge, and influence are hidden beneath everyone’s feet.

People may laugh at his name when they first hear it. By the end of his storyline, the player understands that The Plumber can decide which cities receive clean water, which settlements drown, which bunkers remain sealed, and which armies suddenly lose access to their underground routes.

His Real Identity Should Remain Uncertain

The Plumber introduces himself as Elias Mercer, but evidence found throughout the game raises doubts about whether that is his real name.

Municipal records list several people connected to the Mercer family:

Elias Mercer, a pre-war civil engineer
Elias Mercer Jr., a water-treatment supervisor
E. Mercer, a Vault infrastructure consultant
A maintenance foreman who disappeared shortly before the bombs fell
A post-war drifter mentioned in records written more than a century ago

The current Plumber appears to be somewhere between fifty and seventy years old, but some underground communities claim he has been maintaining the pipes for generations.

Possible explanations include:

“The Plumber” is a title passed from master to apprentice.
He is a ghoul who conceals his condition beneath protective clothing.
He has repeatedly used experimental medical equipment.
He is a synth-like artificial human built to preserve infrastructure.
The underground residents deliberately mix several Plumbers’ histories together.
He is an ordinary man who encourages the legend because it protects him.

The game should never fully confirm the truth unless the player completes his most difficult hidden questline.

The Plumber’s Philosophy

The Plumber sees civilization as a living machine.

Settlements are organs. Roads are arteries. Sewers remove disease. Water mains carry life. Power lines are nerves. Factories are muscles. Leaders are merely temporary operators.

He believes most wasteland factions make the same mistake: they fight over symbols of power while ignoring the systems that make power possible.

“Flags don’t keep children alive. Pipes do.”

He has developed what he calls The Pressure Doctrine.

The Pressure Doctrine

According to The Plumber, every society is controlled by five pressures:

Water pressure
Food pressure
Population pressure
Military pressure
Political pressure

A good leader releases pressure before something breaks.

A tyrant redirects pressure toward enemies.

A fool ignores it until the entire system ruptures.

The player’s actions throughout his questline can push him toward one of three ideological paths.

The Caretaker

He uses infrastructure to protect communities and decentralize power.

The Controller

He concludes that ordinary settlements cannot manage essential systems and begins imposing strict rules.

The Breaker

He decides the old world’s infrastructure creates dependency and should be dismantled so communities can rebuild locally.

His Underground Workshop

The Junction should feel like one of the most distinctive locations in Fallout 5.

It is built inside a massive pre-war distribution chamber where six water mains, three sewer tunnels, a subway service line, and a geothermal pipe network converge.

Main Areas

The Valve Cathedral

A huge circular chamber filled with towering pipes and enormous hand-operated valves.

The Plumber has painted names on the valves based on the communities they affect:

Mercy
Hunger
Ash Town
Old Market
The Nursery
South Graves
The Citadel
No Man’s Tap

Turning one valve may provide water to one district while reducing pressure somewhere else.

Some valves require multiple people, powered equipment, or repaired machinery to operate.

The Map Room

The walls and ceiling are covered with layered infrastructure maps.

Some are official municipal diagrams. Others are handwritten additions documenting:

Mutant nests
Flooded Vault entrances
Raider tunnels
Weak foundations
Buried military facilities
Natural underground springs
Faction-controlled pipelines
Secret exits beneath government buildings
Unexploded gas lines
Areas where something scratches from inside the pipes

The player can help update the map, gradually revealing a second underground world map beneath the surface map.

The Pressure Garden

The Plumber has converted an old filtration chamber into an underground greenhouse.

It uses:

Warm wastewater
Condensation collectors
Nutrient-rich sludge
Recycled human waste
UV grow lamps
Fungal soil beds
Irrigated root channels

The garden contains unusual crops that only grow underground.

Examples include:

Pipevine: A fibrous plant used for crafting filters
Steamcap: A mushroom that grows near hot pipes
Glowroot: A mildly radioactive edible root
Drainmint: Used in medicine and poison resistance
Rustleaf: Absorbs certain metals from contaminated soil
Blue Condensers: Flowers that collect moisture in their petals

The Tool Cemetery

A locked room containing tools owned by previous apprentices and workers who died underground.

Each tool has a name and a story.

The Plumber refuses to throw them away because he believes tools remember the hands that used them.

The player may discover that one tool belongs to someone The Plumber claimed never existed.

The Listening Wall

The Plumber has connected hundreds of thin pipes to an acoustic monitoring station.

By placing his ear against different pipes, he can hear:

Pumps turning on
Distant explosions
Footsteps in maintenance tunnels
Settlers using water
Creatures moving through drains
Raiders cutting through metal
Voices traveling through connected plumbing
Water hammer indicating damaged valves

He sometimes hears knocking from a sealed network that does not appear on any known map.

Expanded Companion Mechanics

The Plumber should not behave like a standard gun-carrying companion. He should interact with the environment constantly.

Environmental Observations

When entering a building, he may comment on:

Broken sprinklers
Unstable boilers
Gas leaks
Clogged drainage systems
Hidden maintenance doors
Water stains concealing structural damage
Recently used pipes
Improvised enemy plumbing
Nearby underground chambers
Incorrectly installed settlement equipment

His observations can reveal alternate paths or hazards.

“That wall is sweating. There’s a warm room behind it.”

“Don’t touch that switch. The pipe beside it is carrying gas.”

“Someone flushed recently. We’re not alone.”

Tactical Plumbing

When combat begins, The Plumber evaluates nearby infrastructure.

Possible actions include:

Opening a steam valve behind enemies
Bursting a pipe to create slippery terrain
Flooding a trench
Turning on a fire-suppression system
Filling a room with sprinkler mist that reduces visibility
Triggering a sewage backflow
Using water pressure to force open a door
Overloading a boiler
Redirecting coolant onto robots
Igniting gas trapped in old lines

The player can command him through a radial menu.

Tactical Commands

Burst It
Flood It
Drain It
Cool It
Heat It
Seal It
Redirect It
Leave It Alone

Some commands create permanent environmental changes.

The Plumber’s Crafting Discipline

He unlocks a new crafting category called Utility Engineering.

This allows the player to build weapons, settlement systems, traps, and exploration tools from industrial components.

New Crafting Materials

Copper fittings
Ceramic valve seals
Pressure gauges
Flexible tubing
Industrial adhesive
Pump rotors
Filter membranes
Rubber gaskets
Chemical cartridges
Sewer gas canisters
Boiler plates
Maintenance keys

Additional Weapons

The Water Hammer

A pneumatic melee weapon built from a piston, pressure chamber, and heavy metal cap.

Each strike stores pressure. After several hits, the player can release a devastating hydraulic blow.

Modifications

Concrete Breaker
Armor Denting Head
Shock Piston
Cryogenic Chamber
Steam Burst
Rad-Sludge Injection

Tap-Out

A compact pipe pistol that fires custom plumbing cartridges.

A reference to both turning off a tap and forcing someone to surrender.

Ammunition Types

Metal rivets
Ceramic shards
Boiling-water capsules
Rusted nails
Chemical pellets
Salt rounds
Pressurized glass fragments

The Porcelain Punisher

A humorous but deadly blunderbuss made from reinforced bathroom fixtures.

It fires scrap from a ceramic pressure chamber.

Rare ammunition can include:

Broken tiles
Sink fragments
Ball bearings
Silverware
Teeth
Small plumbing fittings

It has a chance to shatter and injure the user if poorly maintained.

Geyser Gun

A heavy weapon connected to a backpack pressure tank.

It fires a vertical blast that launches enemies upward or knocks them off ledges.

The weapon can also:

Remove mud from blocked entrances
Expose buried objects
Extinguish fires
Push floating objects across water
Clean corrosive contamination from equipment
Propel small rafts

Drain Cleaner

A chemical projector that sprays highly corrosive liquid.

It is extremely effective against:

Organic growth
Mirelurks
Mutant fungi
Soft-bodied creatures
Rusted mechanical joints

The Plumber dislikes using it near clean water because contamination can spread.

Pipe Organ

A stationary settlement weapon constructed from multiple pressure tubes.

When triggered, it fires a sequence of compressed-air projectiles while producing disturbing musical tones.

Different pipe arrangements create different firing patterns.

Unique Armor Set: Municipal Survivor Gear

The Plumber can teach the player to build a specialized armor set.

Utility Helmet

Features:

Headlamp
Gas detector
Pressure scanner
Rebreather attachment
Underground mapping display

Sewer Coat

Provides resistance against:

Acid
Poison
Disease
Radiation
Contaminated water

Wader Leggings

Allow faster movement through shallow water and sludge.

Grip Boots

Reduce slipping and improve stability during floods, storms, and knockback attacks.

Utility Harness

Increases carrying capacity for tools, liquids, and crafting parts.

Infrastructure-Based Exploration

The Plumber’s storyline should unlock a new layer of environmental exploration.

Pipe Entry Points

The player can enter certain large industrial pipes.

Some become:

Shortcuts
Creature nests
Smuggling routes
Hidden Vault entrances
Pre-war escape tunnels
Secret faction passages
Underwater pathways
Traps designed by The Plumber

Smaller companions cannot always follow. Certain robots can be sent inside first.

Water-Level Manipulation

Some dungeons should change depending on how the player controls water.

The player may:

Flood an area to reach an elevated walkway
Drain a reservoir to reveal a buried town
Raise water to move floating debris
Lower water to access machinery
Redirect a river into an enemy camp
Fill a dry moat around a settlement
Remove water and expose aquatic monsters
Wash radiation downstream
Create a new lake that changes local ecology

A major decision should be irreversible. A district may remain flooded or dry for the rest of the game.

New Underground Creatures

Drain Devils

Hairless, dog-sized mutants that crawl through sewer pipes.

They locate prey through vibrations and can enter buildings through damaged toilets, drains, and sinks.

The player may hear scratching before they emerge.

Valvebacks

Large armored amphibians with circular shell formations resembling valve wheels.

They attach themselves to pipes and drink contaminated water.

Killing one may increase water flow but release stored radiation.

Steam Widows

Pale arachnids that live near hot industrial pipes.

Their webs seal vents and trap pressurized steam. When disturbed, the webs rupture and fill corridors with boiling vapor.

The Gurgler

A mutated predator that mimics the sound of water moving through pipes.

It lures travelers toward flooded chambers.

The player may hear:

A dripping faucet
A running shower
Someone calling through a drain
A child crying behind a wall
The sound of clean water

Sewer Brahmin

Brahmin adapted to underground living.

They are smaller, pale, and nearly blind. Tunnel communities use them to transport supplies through narrow routes.

Their milk has a strong mineral taste and slight disease resistance.

Manhole Mimics

Mutated organisms that disguise themselves as damaged manhole covers.

They attack when stepped on, dragging victims into the sewer.

A Perception check can reveal breathing, mucus, or slight movement.

Human Groups Connected to Him

The Valvekeepers

A neutral order of engineers, mechanics, ghouls, and scavengers trained by former Plumbers.

They maintain essential systems and refuse to carry faction banners while working.

Their symbol is an open valve inside a circle.

Rules of the Valvekeepers

Never poison a civilian water source.
Never destroy infrastructure that can be repaired.
Never conceal a leak that threatens others.
Never deny water to children.
Never teach the complete network to one ruler.
Never open a sealed red valve without three witnesses.

The final rule concerns something called The Red Current.

The Cloggers

The Cloggers began as scavengers who stole copper pipe. They evolved into organized infrastructure terrorists.

They block lines, contaminate reservoirs, and then charge settlements for repairs.

Their armor is made from:

Toilet tanks
Boiler plating
Drain grates
Rubber hoses
Pipe clamps
Maintenance signs

They leave a symbol resembling a clogged drain at attacked settlements.

The Flushers

A radical anti-contamination cult.

They believe the wasteland can only be purified by sending all filth “downward.”

They dump:

Radioactive waste
Corpses
Chemicals
Diseased animals
Unwanted prisoners

Their actions are slowly poisoning underground communities.

Their leader, Saint Siphon, claims a mythical machine beneath the city will cleanse anything placed into it.

The Water Merchants

A wealthy caravan network that sells purified water at extreme prices.

They publicly praise The Plumber but secretly want him dead because restored municipal water would destroy their monopoly.

They hire mercenaries to sabotage repaired systems while blaming poor maintenance.

The Underflow

An underground settlement network that has survived for generations beneath the ruins.

They use plumbing symbols instead of road signs.

They refer to surface residents as Drywalkers.

Some want peaceful trade. Others believe the surface has no right to the water flowing beneath it.

The Red Current

The Plumber’s largest secret should involve an unknown liquid moving through an isolated pipeline.

The fluid is dark red, warm, and slightly luminescent.

Pre-war records identify it only as:

Municipal Line R-0: Continuity Material Transfer

The line does not appear to carry water.

Possible discoveries suggest it may be:

Experimental medical fluid
Liquid nuclear coolant
Cloned biological material
A substance used in Vault experiments
Industrial nutrient slurry
Preserved human blood
A self-replicating repair organism
A living substance spreading through the network

The Plumber has spent years preventing anyone from opening the red valves.

He claims:

“Water gives life. That line remembers how to make it.”

Major Expansion Quest: The Red Valve

The player discovers that a major faction has located one of the sealed red valves.

Stage One: The Knock

The Plumber reports hearing a rhythmic knocking inside the isolated pipe network.

The pattern resembles an old maintenance distress code.

Three knocks. Pause. Two knocks. Pause. Three knocks.

Someone, or something, may be alive inside.

Stage Two: Blood in the Pipes

Red fluid begins leaking into local water supplies.

People exposed to small amounts experience:

Rapid healing
Fever
Shared dreams
Increased aggression
Strange memories
Temporary resistance to radiation
Growths beneath the skin

The Plumber wants the network sealed.

A medical faction wants samples.

A military faction wants to weaponize it.

A religious group believes it is the blood of the earth.

Stage Three: The Living Main

The player enters the red pipeline and discovers that its interior has become organic.

Metal has fused with tissue. Valves pulse like hearts. Pipes contract when touched.

Maintenance robots have grown biological material around their frames.

The player learns the pre-war system was designed to distribute a regenerative biological agent after nuclear attack.

The agent survived, mutated, and has spent two centuries repairing the underground network according to its own interpretation of human anatomy.

It now believes the entire city is one damaged organism.

Final Choice

Kill the System

Destroy the living network before it spreads.

This prevents mutation but permanently eliminates several self-repairing water systems.

Control the System

Use The Plumber’s knowledge to direct it.

Settlements gain extraordinary healing and infrastructure restoration, but mutations begin appearing.

Free the System

Allow it to expand without human control.

The underground environment becomes increasingly alive. Pipes heal, buildings grow tissue, and new creatures appear.

Merge With It

The Plumber volunteers, or is forced, to bond with the system.

He becomes a living controller connected to every pipe in the region.

His voice can later be heard through sinks, drains, radiators, and water pumps.

The Plumber’s Apprentices

The Plumber has trained several apprentices, but few remained loyal.

Wrench

A young mechanic who believes every infrastructure problem can be solved through force.

She prefers explosives and oversized tools.

She may become a recruitable settlement engineer.

Gauge

A former Water Merchant accountant who tracks water flow, population, and resource use.

He believes every drop should be recorded and rationed.

If given power, he may become authoritarian.

Drip

A quiet tunnel scout who can travel through spaces others cannot.

Some believe Drip is a ghoul child. Others claim Drip has not aged in decades.

Drip communicates by tapping on pipes.

Copper

The Plumber’s former favorite apprentice.

Copper disappeared after discovering that The Plumber deliberately withheld water from a rebellious settlement.

Copper now leads a faction that sabotages centralized infrastructure.

The player must decide whether Copper is a terrorist, whistleblower, revolutionary, or all three.

Companion Conflict

The Plumber should sometimes disagree strongly with other companions.

With a Militaristic Companion

Soldier: “Give us control of the reservoir and we can secure the region.”

The Plumber: “Every army says that before it starts deciding who deserves to drink.”

With a Ghoul Companion

Ghoul: “These pipes were old when I still had skin.”

The Plumber: “Then stop leaning on them.”

With a Robot Companion

Robot: “Municipal maintenance remains 97.3 percent overdue.”

The Plumber: “Best news I’ve heard all week. Thought it was worse.”

With a Wealthy Companion

Companion: “Clean water is a valuable commodity.”

The Plumber: “Only to people who think thirst is a business opportunity.”

Morally Difficult Decisions

The Plumber’s quests should avoid simple good and evil choices.

The Hospital Line

A damaged water main serves both a hospital settlement and a farming community.

There is not enough pressure for both.

Save the hospital and crops fail.
Save the farms and patients die.
Attempt a difficult repair requiring rare materials.
Steal water from a third faction.
Evacuate one community.
Contaminate the line temporarily to increase flow.

The Raider Reservoir

A raider camp controls a reservoir but also supports hundreds of noncombatants.

Poisoning the reservoir will defeat the raiders but kill their dependents.

The Plumber refuses unless the player persuades or threatens him.

The Drowned Vault

A flooded Vault contains a functioning purifier.

Draining it could provide clean water to the region.

However, the flood is the only thing containing a dangerous experiment in the lower levels.

The Dry Town

A settlement unknowingly sits above a massive underground reservoir.

Opening the reservoir could save thousands elsewhere but would collapse the ground beneath the town.

The Last Spring

A rare natural spring is sacred to a local community.

The Plumber believes connecting it to the regional network is the only sustainable solution.

The community believes the connection would destroy both the spring and their identity.

Reputation Titles

The player’s infrastructure decisions can earn unique titles.

Pipe Friend
Leak Chaser
Water Thief
Valvekeeper
Floodbringer
Drain Lord
Reservoir Warden
The Second Plumber
Dryland Tyrant
Keeper of the Current

NPCs should react differently depending on the title.

The Player Can Become His Successor

If the player completes his training and earns maximum approval, The Plumber offers access to his complete infrastructure archive.

He places an old municipal badge on the table.

“Plumber isn’t a name. It’s the person who answers when the world starts leaking.”

The player may accept or reject the title.

Accepting unlocks:

Master-level infrastructure construction
Unique dialogue with underground communities
Access to sealed maintenance areas
Authority over the Valvekeepers
Special water-related settlement policies
The ability to recruit apprentices
A regional emergency-response system

The player’s version of The Plumber can become compassionate, ruthless, commercial, faction-aligned, or completely independent.

Settlement Emergency Events

Once The Plumber’s systems are installed, settlements can experience infrastructure emergencies.

Possible Events

Burst water main
Contaminated well
Sewer infestation
Frozen pipe network
Sabotaged purifier
Missing maintenance worker
Flooded crop field
Boiler explosion
Water theft
Pressure loss
Chemical backflow
Creature trapped in a reservoir
Settlers disappearing through drains
Unknown voices coming from faucets

The player can respond personally, send The Plumber, assign an apprentice, or ignore the problem.

Ignoring maintenance creates visible consequences.

Roads flood. Disease rises. Crops die. Buildings collapse. Settlers leave.

Humor and Dark Fallout Tone

The character should still have humorous moments.

Random Dialogue

“Pre-war people had clean water delivered directly into their homes. Then they used half of it to move waste six feet.”

“That toilet’s worth more than your rifle. Rifle doesn’t produce fertilizer.”

“You ever been bitten by something while sitting down? No? Then respect the plumber.”

“People keep asking whether I can fix their sink. I can. I just don’t like them.”

“Vault-Tec built underground cities and somehow still installed the cheapest valves available.”

“Never trust a man with a clean wrench.”

Visual Storytelling Around Him

The world should gradually show The Plumber’s influence.

Before meeting him:

Broken hydrants leak into streets.
Settlements use dirty wells.
Sewer entrances are blocked.
Flooded buildings are inaccessible.
Water merchants dominate local trade.

After helping him:

Hydrants function.
Irrigation channels feed crops.
Children play near clean fountains.
Tunnel caravans move between settlements.
Fire systems activate during raids.
Formerly flooded neighborhoods reopen.
Water merchants lower prices or turn hostile.
New aquatic wildlife appears.
Some regions suffer because water was redirected elsewhere.

His work should physically alter the map.

Final Character Direction

The Plumber should begin as a seemingly eccentric utility worker carrying an oversized wrench.

He gradually becomes:

A companion
A teacher
A settlement specialist
An infrastructure strategist
A keeper of forbidden pre-war systems
A possible antagonist
A potential regional leader
A symbol of how civilization is truly rebuilt

His central question would not be:

Who should rule the wasteland?

It would be:

Who should control what everyone needs to survive?

The Plumber: Deeper Character, Quest, and Gameplay Expansion

The Plumber should have enough depth to function as a companion, regional quest-giver, settlement engineer, underground faction leader, and possible late-game antagonist.

At first, the player hears humorous stories about a man repairing toilets in ruined buildings. Later, it becomes clear that he possesses the only complete map of the region’s underground infrastructure.

The Plumber’s Introduction

The player first encounters The Plumber during a settlement emergency called “Something in the Pipes.”

Residents have reported:

Blood coming from faucets
Missing tools near drainage grates
Strange voices traveling through pipes
Water pressure dropping every night
A child claiming someone speaks to her through the sink
Several settlers disappearing from locked homes

The settlement believes the water system is haunted.

The Plumber arrives wearing a patched utility coat, carrying his enormous wrench and pulling a small maintenance robot behind him.

He listens to a pipe with a homemade stethoscope and says:

“Not haunted. Hungry.”

He determines that a creature has entered the municipal line and is using abandoned plumbing to move beneath the settlement.

The introductory mission requires the player to follow him into the utility tunnels, where the problem turns out to be larger than expected.

A group of tunnel scavengers has been feeding captives to a mutant organism that grows inside the pipes.

The player can:

Kill the organism
Force it deeper into the sewer system
Capture it for research
Redirect it toward a raider settlement
Allow The Plumber to seal it inside the network
Discover that the creature may be intelligent

This quest establishes that The Plumber solves problems other characters do not even understand.

The Plumber’s Maintenance Robot

The Plumber travels with a small utility robot named P-Trap.

P-Trap was originally a pre-war municipal inspection robot designed to enter narrow pipes and identify blockages.

Appearance

P-Trap has:

A cylindrical body
Four retractable mechanical legs
A spinning drain-auger attachment
A small camera lens
Flashing hazard lights
A flexible tail containing sensors
Municipal warning stickers
A speaker that constantly announces code violations

Personality

P-Trap is overly serious and treats every wasteland structure as a municipal violation.

“WARNING: THIS RESIDENCE HAS FAILED 217 CONSECUTIVE SAFETY INSPECTIONS.”

“UNLICENSED NUCLEAR REACTOR DETECTED.”

“OCCUPANCY LIMIT EXCEEDED BY APPROXIMATELY FORTY-SEVEN FERAL GHOULS.”

The Plumber argues with it constantly.

P-Trap: “REPAIR REQUIRES CERTIFIED MUNICIPAL PERSONNEL.”

The Plumber: “They’ve been dead for two hundred years.”

P-Trap: “CERTIFICATION STATUS UNCONFIRMED.”

Gameplay Functions

P-Trap can:

Enter small pipes inaccessible to the player
Scout rooms through drainage systems
Retrieve keys and small objects
Detect gas leaks
Mark underground enemies
Unclog settlement water systems
Repair minor pipe damage
Carry liquid samples
Release smoke, steam, or cleaning chemicals
Distract robots by issuing official maintenance commands

The player may eventually upgrade P-Trap into a combat, medical, reconnaissance, or settlement-maintenance robot.

The Underground Transit Network

The Plumber knows that the utility network connects nearly every major district.

After completing several quests, the player can help restore a system called the Service Line.

This becomes an underground fast-travel network.

Service-Line Stations

Each station requires the player to:

Remove creatures
Repair pumps
Restore electricity
Open pressure doors
Drain flooded sections
Negotiate with underground inhabitants
Defeat factions occupying maintenance rooms

Restored stations allow travel between settlements without crossing dangerous surface territory.

However, using the underground routes has risks.

Possible encounters include:

Tunnel collapses
Sewer ambushes
Maintenance robots demanding permits
Flood surges
Toxic-gas leaks
Creatures entering the line
Smugglers using the route
Settlers trapped underground
Factions attempting to claim stations

The Service Line can become safer or more dangerous depending on player investments and political decisions.

The Plumber’s Skill Tree

Training with The Plumber unlocks a unique perk category called Municipal Engineering.

Rank 1: Leak Detection

The player can identify:

Hidden water sources
Damaged pipes
Weak walls
Pressure hazards
Concealed utility entrances

Water leaks occasionally lead to hidden rooms or buried supplies.

Rank 2: Improvised Pressure

The player can create pressure-based traps from ordinary plumbing materials.

Examples include:

Steam mines
Burst-pipe traps
Scalding tripwires
Pressurized nail launchers
Chemical backflow traps

Rank 3: Water Quality

The player can test liquids and identify:

Radiation
Poison
Disease
Chemical contamination
Mutagenic properties
Medical compounds

The player can also purify small amounts of water without a workbench.

Rank 4: System Override

The player can use utility terminals and valves to manipulate entire buildings.

Options may include:

Activating sprinklers
Shutting off coolant
Flooding lower levels
Releasing steam
Draining tanks
Cutting water to enemy areas
Triggering fire-suppression foam

Rank 5: Infrastructure Warfare

The player can sabotage faction infrastructure.

Possible targets include:

Wells
Irrigation
Sewers
Cooling systems
Industrial pumps
Fire-suppression networks
Underground transportation

These actions can weaken a faction without direct combat.

Rank 6: Master of the Current

The player can connect settlements to a regional infrastructure network.

Benefits may include:

Shared water production
Lower disease rates
Faster settlement growth
Underground supply routes
Emergency fire response
Regional irrigation
Improved sanitation
Increased food production

The downside is that connected settlements can suffer together if the network is contaminated or sabotaged.

The Plumber’s Unique Companion Perk Tree

His companion perk should evolve based on how the player influences him.

Caretaker Path: Clean Flow

Settlement water production increases
Disease spreads more slowly
Purified water heals more
Settlers recover faster after raids
Water shortages generate fewer negative events

Controller Path: Pressure Authority

Connected settlements produce more resources
Settlers obey emergency commands more quickly
Water can be rationed to increase productivity
Hostile settlements can be pressured into negotiations
Happiness decreases if rationing becomes severe

Saboteur Path: Backflow

Increased damage from traps
Easier poisoning of enemy supplies
Better stealth in utility tunnels
Enemy bases can suffer mechanical failures
Factions become more suspicious of infrastructure attacks

Living Network Path: Voice in the Pipes

Unlocked through the Red Current storyline.

The Plumber can detect enemies through plumbing
Organic pipes slowly repair themselves
The player receives regeneration near connected water
Strange mutations may appear in settlements
The Plumber occasionally speaks through distant plumbing fixtures

Signature Questline: The Copper War

Copper, The Plumber’s former apprentice, begins attacking water facilities across the region.

The attacks initially appear to be senseless terrorism.

The Plumber claims Copper became obsessed with destroying centralized systems.

Copper claims The Plumber secretly manipulates communities by controlling their water.

Both are partially correct.

Quest One: The First Cut

A major settlement loses water after someone removes a critical section of copper pipe.

The player follows the stolen material to a refugee camp.

The refugees are using the pipe to build a purifier because The Plumber refused to connect them to the regional network.

The player can:

Return the pipe
Help the refugees build their purifier
Find replacement materials
Force the settlement to share water
Expose The Plumber’s refusal
Blame Copper

Quest Two: No Pressure

Copper sabotages a pumping station serving a wealthy district.

The district has been using far more water than poorer settlements.

Copper demands that The Plumber redistribute the supply.

The Plumber argues that lowering pressure could disable the entire network.

The player may:

Support Copper’s redistribution
Support The Plumber
Repair the network with expensive components
Shut down luxury water usage
Create a rationing system
Secretly divert water elsewhere

Quest Three: The Apprentices’ Table

The Plumber’s surviving apprentices gather at The Junction.

Each presents a different philosophy.

Wrench

Infrastructure should be protected by force.

Gauge

Every drop should be measured and rationed.

Copper

No individual should control essential resources.

Drip

The underground communities should control underground water.

The Plumber

Technical knowledge must remain with those capable of maintaining the system.

The player determines who should inherit authority.

Quest Four: Copper Burns

Copper plans to destroy the central pressure chamber.

Doing so would eliminate The Plumber’s control but also damage the regional water network.

Possible outcomes include:

Kill Copper
Arrest Copper
Join Copper
Convince Copper to stand down
Replace The Plumber
Establish a council
Divide the network into independent systems
Destroy the network
Fake Copper’s death and send her into exile

Copper can later become a companion, enemy, settlement engineer, or faction leader.

The Plumber’s Hidden Moral Failure

The Plumber should not be entirely heroic.

Years before meeting the player, he discovered that the water network could not support every settlement during a severe drought.

He chose which communities would receive water.

He prioritized:

Settlements with children
Agricultural communities
Medical facilities
Locations with repair specialists
Communities that could defend pumping stations

He abandoned several isolated towns.

One of those towns was Copper’s home.

The Plumber insists that there was no alternative.

Evidence may reveal that there was another solution, but it would have required him to surrender control of The Junction.

He chose to protect the network and his authority.

This creates an important question:

Did he save thousands, or did he decide that his own judgment mattered more than other people’s lives?

Additional Named Locations

The Great Cistern

A massive underground chamber supported by hundreds of stone pillars.

The water is unusually clear, but creatures move beneath its surface.

A settlement lives on platforms suspended above the reservoir.

The inhabitants never swim because they believe something enormous lives at the bottom.

The Plumber suspects the reservoir contains a pre-war mobile purification machine.

The Boil House

An industrial heating station where ruptured steam lines have created a permanently hot environment.

Residents survive by using heat-resistant clothing and steam-powered machinery.

The area includes:

Steam farms
Boiled fungal crops
Heat-adapted mutants
Pressure-powered elevators
Sauna-like medical rooms
Steam weapons

The Boil House can become an ally, enemy, or production settlement.

Drymouth

A settlement built around an empty water tower.

Its people believe the tower will one day refill when a prophesied engineer arrives.

The player may be mistaken for the promised figure.

Restoring the tower can save the settlement, but the water line crosses territory controlled by another community.

The Porcelain Palace

A bizarre underground trading post built from salvaged bathroom fixtures.

Its ruler, The Commodore, sits on an ornate golden toilet and controls the region’s ceramic trade.

The settlement produces:

Toilets
Sinks
Ceramic armor
Chemical tanks
Filter housings
Decorative tiles

The Porcelain Palace appears humorous but controls materials needed for advanced infrastructure.

The Maze of Mains

A dense network of nearly identical pipes, tunnels, and maintenance rooms.

Compasses malfunction because of metal interference.

The walls carry old navigation markings, but someone has altered them.

The Maze contains:

Lost scavengers
Former Plumber apprentices
Maintenance robots
Pipe-dwelling mutants
An abandoned emergency shelter
A hidden entrance to The Junction

The layout may change after floods, collapses, or player decisions.

Overflow

A surface neighborhood permanently flooded by a broken reservoir.

The upper floors of buildings have been connected with bridges.

Residents travel by improvised boats.

The player may drain Overflow, preserve it, or increase the water level.

Each option changes the community:

Draining reveals loot and buried dangers.
Preserving supports fishing and water trade.
Raising the level protects the settlement but destroys lower buildings.

The Thirsting Fields

An enormous area of dead farmland.

Beneath it lies a functioning irrigation network, but turning it on would draw water from several settlements.

Restoring the fields could feed thousands.

The player must decide whether water is more valuable for drinking or agriculture.

Underground Economy

The Plumber’s network should create a new regional economy.

Valuable Infrastructure Commodities

Copper pipe
Rubber seals
Purification chemicals
Ceramic filters
Pump motors
Pressure regulators
Industrial lubricants
Water-testing equipment
Storage tanks
Plumbing tools
Replacement valves

Copper becomes one of the most valuable resources in the game.

This creates new criminal activity:

Pipe theft
Illegal water tapping
Counterfeit filters
Purifier sabotage
Reservoir smuggling
Water-meter manipulation
Toxic-waste dumping
Settlement extortion

Water Rights System

Settlements connected to The Plumber’s network can enter water agreements.

The player can establish different policies.

Equal Distribution

Every connected settlement receives a basic water supply.

This improves fairness but limits economic growth.

Population Distribution

Larger settlements receive more water.

Small communities may feel ignored.

Production Distribution

Farms, factories, and medical facilities receive priority.

Productivity rises, but residential settlements suffer.

Contribution Distribution

Communities receive water based on the resources they provide.

Poor settlements struggle to compete.

Emergency Authority

The player or The Plumber decides distribution during crises.

This is efficient but creates the possibility of dictatorship.

Local Ownership

Every settlement controls its own section of the network.

This increases freedom but makes coordination and repairs more difficult.

Dynamic Infrastructure Crises

Infrastructure should deteriorate naturally if ignored.

Minor Problems

Leaking pipes
Clogged drains
Broken pumps
Contaminated tanks
Low pressure
Stolen tools
Damaged filters

Major Problems

Reservoir rupture
Sewage backflow
Regional drought
Chemical spill
Mutant infestation
Faction sabotage
Ground collapse
Pipe-borne disease
Flooded settlement
Water-war outbreak

The player can assign personnel to handle emergencies.

Possible specialists include:

The Plumber
Copper
Wrench
Gauge
Settlement engineers
Robots
Faction technicians

The outcome depends on their skills and personalities.

Wrench may solve a problem quickly but damage equipment.

Gauge may conserve resources but restrict civilian water.

Copper may decentralize the system without permission.

The Plumber may make the technically correct choice while ignoring local politics.

New Enemy Faction: The Water Cutters

The Water Cutters are professional saboteurs hired by merchants, raiders, and political factions.

They do not attack settlements directly.

Instead, they:

Cut pipelines
Poison filters
Destroy pumps
Steal pressure regulators
Redirect sewage
Place explosives beneath reservoirs
Leave false evidence blaming rivals

Their leader is called The Diviner, a former water prospector who can locate underground water without equipment.

The Diviner believes water should remain scarce because scarcity creates power.

“Nobody pays for rain. That’s why rain never ruled anything.”

The player may destroy the Water Cutters, hire them, infiltrate them, or place them under The Plumber’s control.

New Enemy Type: Pipejackers

Pipejackers are raiders who enter settlements through utility systems.

Unlike ordinary raiders, they study settlement plumbing before attacking.

They may emerge from:

Toilets
Basements
Wells
Drainage channels
Maintenance hatches
Flood tunnels
Water towers

They can sabotage defenses from inside.

Settlements need new protective structures:

Drain cages
Backflow gates
Motion sensors
Pipe turrets
Utility patrols
Inspection robots

The Plumber can train settlers as Line Watchers to defend underground approaches.

Infrastructure-Based Combat Encounters

Boiler-Room Battle

Enemies occupy a factory filled with unstable pressure tanks.

The player can:

Fight normally
Release steam
Disable the boiler
Overload the system
Flood the room
Use coolant to freeze machinery
Trigger a controlled explosion

Reservoir Ambush

Enemies attack while the player stands on floating platforms.

Water levels rise and fall during combat.

Creatures may attack from beneath the surface.

Sewer Pursuit

A flood wave moves through a tunnel while the player chases an enemy.

The player must open gates, climb platforms, and avoid being swept away.

Pumping-Station Siege

The player defends engineers while pumps are restarted.

Different valves control defensive systems.

Vertical Pipe Fight

Combat takes place inside a giant vertical maintenance shaft.

The player climbs ladders and platforms while steam and water erupt from damaged pipes.

The Plumber’s Boss-Fight Possibility

If the player turns him into an enemy, The Plumber should be one of the most difficult non-powered-armor human opponents.

He does not confront the player in an open room.

He chooses a battlefield filled with controllable infrastructure.

During the fight, he can:

Flood sections of the arena
Release boiling steam
Shut off lighting
Electrify standing water
Seal doors
Activate maintenance robots
Collapse walkways
Release sewer creatures
Redirect toxic gas
Escape through maintenance passages

He speaks through the public-address system.

“You came into my house carrying a gun. I built the floor you’re standing on.”

The player can defeat him through:

Direct combat
Engineering
Hacking
Disabling pressure systems
Turning his apprentices against him
Convincing P-Trap that he violated municipal safety law
Exposing his moral failures
Trapping him inside his own network

He may surrender if the player proves capable of maintaining the system.

The Plumber as a Regional Leader

If given control, The Plumber creates an organization called the Common Utility Authority.

It promises:

Clean water
Sewage removal
Fire protection
Irrigation
Maintenance
Emergency repairs

In exchange, settlements must accept:

Water meters
Mandatory maintenance labor
Infrastructure taxes
Inspection rights
Restrictions on private wells
Penalties for waste
Authority access to all connected buildings

At first, the system works extremely well.

Disease falls. Crop production increases. Fires become less destructive.

Over time, some communities accuse The Plumber of becoming an unelected ruler.

The player must decide whether to:

Support him
Limit his authority
Replace him
Establish elections
Create an engineering council
Break the network apart
Take control personally

The Plumber’s Personal Habits

Small details would make him feel human.

He Collects Faucets

He keeps rare and unusual faucets from pre-war buildings.

Each has a story:

A hotel faucet from a presidential suite
A child-sized faucet from a school
A gold-plated faucet from a casino
A hospital tap that still runs clean
A Vault faucet containing a hidden microphone
A military faucet designed to recognize officers

He Never Drinks First

Whenever he repairs a water source, he makes someone else test it with equipment before he drinks.

This comes from watching an apprentice die after drinking contaminated water.

He Sleeps Near Running Water

He claims the sound helps him detect pressure changes.

In reality, silence makes him remember the settlements he abandoned.

He Names Major Pipes

Some names are practical. Others are personal.

Old Faithful
Widow’s Line
Copper’s Run
Mercy Main
The Long Drink
Dead Man’s Bend
Mother’s Tap
The Quiet Line

He Repairs Meaningless Things

He occasionally repairs sinks, fountains, showers, and toilets in abandoned buildings even when nobody lives there.

When asked why, he says:

“Something should still work.”

Companion Camp Activities

At camps and settlements, The Plumber may:

Repair water pumps
Inspect toilets
Argue with settlers about waste
Teach children how valves work
Clean his tools
Speak to P-Trap
Check the color of local water
Draw underground maps
Collect rainwater
Repair broken drinking fountains
Complain about decorative plumbing
Quietly carve the names of dead apprentices into wrench handles

Rare World Encounters

The Plumber’s Impostor

A con artist travels between settlements pretending to be The Plumber.

He charges caps for useless repairs and disappears before systems fail.

The real Plumber is furious, not because of the stolen name, but because people may stop trusting legitimate engineers.

The Traveling Bathtub

The player encounters a merchant using a bathtub as a cart.

The Plumber insists the bathtub is a rare pre-war emergency decontamination unit.

The Endless Faucet

A faucet in the middle of a ruined building still produces perfectly clean water.

The pipe does not appear connected to anything.

The Plumber becomes obsessed with discovering its source.

The Singing Pipes

A settlement hears music through its walls every night.

The sound comes from pressure passing through an old pipe-organ system beneath a theater.

The Last Working Shower

A community has built a religion around a functioning hot shower.

The Plumber can repair it fully, dismantle it, or reveal that its water comes from a contaminated hospital.

The Plumber’s Deepest Mystery

Throughout the game, the player discovers maintenance markings bearing The Plumber’s symbol in places he claims never to have visited.

Some markings are more than a century old.

One hidden terminal describes a pre-war emergency program called:

P.L.U.M.B.R.

Pipeline Logistics Utility Maintenance and Biological Restoration

The program combined:

Automated infrastructure management
Human maintenance teams
Biological repair experiments
Emergency population control
Regional water distribution authority

The player must determine whether The Plumber is:

Descended from the program’s personnel
Continuing its mission unknowingly
A surviving biological technician
A clone created by the system
One of several people carrying the title
An artificial caretaker generated by the network
Simply a man who found the equipment and adopted its symbol

The game should provide evidence for several possibilities without fully confirming one.

Endgame World States

The Plumber’s final outcome should visibly transform the region.

Clean Commonwealth

Clean water flows to most settlements.

Disease declines, crops expand, and public fountains return.

Water merchants lose power.

Iron Ration

The network functions efficiently under strict control.

Settlements survive, but water access depends on obedience.

Broken Mains

The central system is destroyed.

Communities become independent but vulnerable.

Some develop local solutions. Others collapse.

Copper Republic

Independent settlement councils share responsibility for the network.

The system is fairer but slower to respond to emergencies.

Underflow Ascendant

Underground communities gain priority access.

New subterranean settlements thrive while surface regions become drier.

Living City

The Red Current spreads through the infrastructure.

Pipes heal, water has regenerative properties, and the city begins behaving like an organism.

Water Baron

The player personally controls the network.

Settlements pay tribute for access.

The player becomes wealthy, feared, and politically dominant.

The Last Plumber

The Plumber destroys the central network and disappears underground.

Years later, travelers report seeing repaired pumps in abandoned settlements.

Nobody knows whether he survived.

Final Identity of the Character

The Plumber should represent a different kind of wasteland power.

He is not powerful because he owns nuclear weapons, commands an army, wears power armor, or controls an ancient supercomputer.

He is powerful because he understands the systems everyone else depends on.

His story would explore:

Public ownership versus private control
Scarcity and resource inequality
Infrastructure as political power
Expertise versus democracy
Survival-based moral compromises
Environmental consequences
The hidden labor required to rebuild civilization
Whether essential resources should ever belong to one person

The Plumber may enter the story as a strange man with a wrench.

He could leave it as the person who quietly decided whether an entire region lived, migrated, surrendered, or died of thirst.