Fins 442 of the Liquidated Ledger

These are not heavy boots, but rather ultra-thin, semi-transparent membranes made of alchemical polymer that slide over an avatar’s natural fins. They are reinforced with “Silver-Inlay Veins” that function like the wiring of a calculator.

Lore

The “442 Series” was developed by the Sub-Aquatic Chamber of Commerce to address the difficulty of keeping dry records in high-pressure oceanic trenches. Before these fins, accountants were forced to use heavy stone tablets that hampered swimming. The 442s solve this by turning the avatar’s own movement through the water into a data-processing engine. As the water flows over the membranes, it is filtered for “Financial Residue”—the tiny traces of mana left behind by discarded coins or sunken contracts.

Detailed Tier 1 Statistics

Slot: Fins (Feet/Tail/Arms).
Tier: 1 (Common).
Color: Translucent Teal with glowing Silver “Vein” patterns.
Weight: Negligible (Weightless in water).

Skills Gained (When Openly Worn)

Hydro-Accounting: The avatar gains a +2 bonus to Intelligence (Investigation) checks to locate sunken treasure or identify the origin of aquatic trade goods.
Buoyant Negotiation: While submerged, the avatar gains Proficiency in Persuasion. The steady, rhythmic pulsing of the fins creates a calming “Professional Frequency” that makes debtors more likely to agree to repayment terms.

Passive Magic

Pressure-Value Index: The fins automatically calculate the “Value-per-Depth.” As the avatar swims deeper, the silver veins glow brighter, indicating the increasing rarity and market price of resources found at that pressure level.
The Current Tally: The membranes vibrate gently when swimming through “Wealthy Water” (water that has recently come near or into contact with large amounts of currency or precious metals), allowing the avatar to track fleeing merchant vessels by their “Gold-Wake.”

Active Magic

Liquidity Shift (Normal Casting): The avatar performs a rapid barrel-roll. The fins release a burst of silver bubbles that “appraise” everyone in a 20-foot radius. For the next minute, the avatar knows exactly how much physical currency each target is carrying.
Solvency Shield (Silent Casting): As a reaction when targeted by a cold-based attack or a “slow” effect, the avatar can stiffen the membranes. The fins convert the incoming kinetic energy into “Floating Capital,” granting the avatar a +10ft bonus to Swim Speed for their next turn instead of taking the penalty.

Additional Information

Osmotic Cleaning: The fins do not require polishing; they are cleaned by swimming through saltwater. However, prolonged exposure to freshwater causes the silver veins to tarnish, temporarily disabling the Current Tally passive.
Tier 1 Constraint: These fins are designed for “Surface Wealth.” If the avatar attempts to use them to calculate the value of an Elder Abyssal God’s hoard, the membranes may “Default” and tear under the mathematical pressure.

Methods of Acquisition

Registry Issuance: Most Tier 1 avatars receive these as part of their “Commercial Reef License.” Upon passing the Basic Buoyancy and Bookkeeping exam, a recruit is directed to a government depot to be fitted with their first set of 442 membranes.
Salvage from Sunken Suites: During “The Great Recession” (a period of localized volcanic activity), many accounting firms in the lower trenches were abandoned. Scavengers often find “New Old Stock” (NOS) 442s preserved in airtight pressurized crates within these ruins.
Fleet Inheritance: It is a tradition among nomadic sea-merchants to pass down their fins to the eldest hatchling. While a “used” set may have frayed edges, the silver veins are often “broken in,” making the Pressure-Value Index significantly more accurate.

Shop Descriptions and Atmosphere

The shops that sell high-grade aquatic accounting gear are found in the “Mid-Current Districts,” where the water is clear and the pressure is stable.

The Gilded Gill (Boutique Administrative Outfitter) These shops are built into giant, hollowed-out conch shells or reinforced glass bubbles.

Atmosphere: The water inside is filtered to a pristine crystalline clarity. Quiet, rhythmic clicking—the sound of mechanical abacuses—fills the space. Vats of “Conductive Nutrient-Ink” sit in the corners for fin-maintenance.
The Experience: You don’t just pick a pair off a shelf. You enter a “Flow-Tank” where a technician measures your fin-stroke velocity. The 442s are then laser-bonded to your natural fins while a receptionist offers you a chilled kelp-smoothie and discusses the latest tax-haven rumors.

Pressure-Point Pawn (The Trench Market) Found in the darker, silt-heavy regions of the lower docks, these shops serve those who operate “off the books.”

Atmosphere: Dimly lit by bioluminescent moss that flickers with every passing current. The shop is a jumble of rusted anchors and old filing cabinets.
The Experience: Haggling is mandatory. The shopkeeper, likely a crusty cephaloid with too many rings, will pull a set of 442s out of a bucket of brine. You have to check the silver veins yourself to ensure they aren’t “short-circuited” by reef-rust.

Buying and Selling Process

The Conductivity Test: To prove the fins are genuine 442s, the seller will drop a single silver coin into a fast-moving current. If the fins flare and the silver veins pulse bright teal before the coin hits the sand, the “Gold-Wake” sensors are functional.
Membrane Bonding: Buying the item involves a “Bio-Sync.” The membranes are slid over the fins and heated slightly until the polymer shrinks to a vacuum-sealed fit. This process is painless but leaves the fins feeling “stiffly professional” for several hours.
The “Dry-Land” Trade: Selling these on the surface is difficult, as the polymer becomes brittle in open air. Surface traders usually only buy them if they have a specialized “Brine-Tank” for transport, often at a 30% markdown.

Estimated Costs

In Saṃsāra, the price of 442s fluctuates slightly based on the local tides and the current price of Silver-Inlay.

Silver Pieces: 30 to 55 Silver. This is the “MSRP” in most reef cities.
Electrum Pieces: 6 to 11 Electrum. This is the preferred currency for auditors, as the electrum resonates with the fin-veins.
Gold Pieces: 0.30 to 0.55 Gold. Usually only paid by surface-dwellers who don’t understand the local silver-backed economy.
The “Freshwater Flaw” Discount: If the fins have been exposed to freshwater and the veins are tarnished, they can be bought for as little as 10 Silver, but they will require a 20 Silver “Re-Polishing” at a professional outfitter.

Fiscal Hydrodynamics: Tactical Maneuvers of the 442 Series

Roleplaying with the Fins 442 of the Liquidated Ledger requires a fluid, calculated grace. You do not simply swim; you “navigate the flow of assets.” In character, your movements should be economical—never wasting a single stroke—and your posture should reflect the unyielding stability of a balanced checkbook, even in the center of a whirlpool.

In the Sun-Dappled Shallow Reefs and Trade Ports

Offense: Use Hydro-Accounting to “sniff out” market manipulation. Roleplay your character gliding slowly over the coral stalls, your fins flaring as you follow the “Gold-Wake” of a merchant trying to hide their untaxed spice-crates. You confront them not with a blade, but with a precise list of their hidden inventory, using your Buoyant Negotiation to force an immediate settlement.
Defense: In a dockside chase, use your Pressure-Value Index to find the most “expensive” path of escape. Roleplay the silver veins in your fins glowing brightly as you dive into a narrow, high-pressure crevice where the local law enforcement’s cheaper, standard-issue gear would crack. You outlast your pursuers by simply being the most “valuable” swimmer in the water.

In the Abyssal Trenches and High-Pressure Zones

Offense: Utilize Liquidity Shift during an ambush by deep-sea predators. Roleplay a sudden, rhythmic beat of your fins that sends a cloud of silver bubbles upward. As the bubbles “appraise” the giant squid or abyssal lurker, you announce its “Market Vulnerability”—the exact spot where its hide is thinnest—allowing your allies to strike with precision.
Defense: When faced with the crushing weight of an underwater collapse or a gravity-spell, invoke your Solvency Shield. Roleplay the teal membranes turning rigid as they absorb the crushing force. Instead of being pinned, you convert that “Debt of Pressure” into “Speed Capital,” darting away from the falling debris at a speed that leaves a silver blur in your wake.

In the Turbulent Open Ocean and Mana-Currents

Offense: During a ship-to-ship boarding action, use the Current Tally to find the most efficient entry point. Roleplay your fins vibrating as you swim against the hull, detecting the exact location of the captain’s safe or the primary mana-battery through the vibrations in the water. You lead the charge directly to the “Heart of the Assets.”
Defense: Against “Slow” magic or entangling seaweed, your fins act as an automatic “Refinancing” tool. Roleplay the silver veins pulsing rhythmically to shake off the magical sludge. You explain to your foes that your momentum is “Pre-Approved” and cannot be halted by mere environmental “Interest Rates.”

In Submerged Ruins and Ancient Vaults

Offense: Use Hydro-Accounting to detect “Structural Debt.” Roleplay your character pointing out a crumbling pillar that is mathematically certain to fall if nudged. You use your fins to create a precise “Current-Blast” that topples the ruin onto your enemies, citing it as an “Unavoidable Asset Write-off.”
Defense: If a trap fills a room with freezing water or toxic silt, use the Pressure-Value Index to find the “Cleanest Dividend” (the safest pocket of water). Roleplay your fins guiding you like a compass toward the exit, your movements as calm and steady as a long-term investment, while your companions struggle in the chaotic “Market Volatility” of the trap.

Perception of Activation:

The activation of the Fins 442 of the Liquidated Ledger transitions the avatar from a mere swimmer to a fluid data-processor. The sensation is one of profound clarity, where the chaotic weight of the ocean is organized into a streamlined financial manifest.

Visual Perception
- Description: The water clarity appears to sharpen significantly. Translucent teal “Value-Lines” trace the movement of all nearby biological and mechanical entities. A shimmering silver overlay identifies objects of high mercantile value, highlighting them with a soft, bioluminescent pulse.
- Positives: Allows for perfect navigation in silt-heavy or pitch-black waters and identifies hidden treasures or pockets of high-quality resources instantly.
- Negatives: The constant “Price-Tagging” of every fish and coral can be visually exhausting and leads to a cynical worldview where everything is seen as a commodity.
Auditory Perception
- Description: The muffled roar of the ocean is replaced by a crisp, rhythmic “Ping” sound, similar to a high-frequency sonar, but with a musical, metallic timbre. Each fin-stroke produces a soft “Chime” that resonates through the avatar’s jawbone.
- Positives: The sonar-pings provide a 360-degree awareness of the avatar’s surroundings, detecting invisible current changes or approaching threats.
- Negatives: High-noise environments (like busy shipping lanes or underwater volcanoes) can cause “Auditory Overload,” resulting in a temporary disorientation or a “ringing” in the gills.
Tactile Perception
- Description: A sensation of “Slickness.” The avatar feels as though their skin has been coated in a frictionless oil. The pressure of the deep sea no longer feels like a weight but like a “Supportive Grip,” pushing the avatar forward with every movement.
- Positives: Drastically reduces swimming fatigue and provides an instinctive understanding of buoyancy, allowing the avatar to hover perfectly still with zero effort.
- Negatives: The lack of friction makes it difficult to “feel” fine textures with the fins, making delicate underwater tasks feel slippery and imprecise.
Extra-Sensory: Osmotic Market-Sense
- Description: The avatar “tastes” the wealth in the water. Saltwater carries the chemical signatures of nearby precious metals, gems, and mana-crystals.
- Positives: Enables the tracking of merchant ships or sunken treasure by following the “Scent of Solvency” through vast oceanic distances.
- Negatives: Swimming through polluted or “economically depressed” waters (like slum-docks) tastes bitter and metallic, causing physical nausea.
Extra-Sensory: Hydro-Calculus
- Description: A subconscious awareness of the “Cost of Movement.” The avatar knows the exact calorie-to-currency ratio of every action they take under the waves.
- Positives: Grants the ability to perform hyper-efficient maneuvers, ensuring the avatar never wastes energy on a suboptimal path.
- Negatives: Can lead to a paralyzing indecision where the avatar refuses to act unless the “Profit Margin” of the movement is sufficiently high.
Extra-Sensory: The Liquidator’s Chill
- Description: A sudden drop in perceived temperature when a “Bad Debt” (a liar or a thief) enters the nearby current.
- Positives: Acts as a biological lie detector; the water literally grows colder around individuals who intend to default on a contract or steal from the avatar.
- Negatives: In areas of high crime or social unrest, the avatar may experience “Thermal Shivers,” making it difficult to maintain a professional composure.

Fabrication Guide: Fins 442 of the Liquidated Ledger

Replicating the 442 Series requires a mastery of hydro-morphic polymers and conductive metallurgy. The challenge lies in creating a membrane that is flexible enough for high-speed swimming but rigid enough to maintain the micro-circuitry required for “Blue Economy” accounting.

Materials Needed

Alchemical Polymer Resin (4 oz): A translucent, shelf-stable liquid that cures into a flexible, pressure-resistant membrane.
Silver-Inlay Wire (10 ft): Hair-thin strands of high-purity silver, pre-treated with “Market-Resonance” salts.
Teal Bioluminescent Pigment: Harvested from deep-sea algae, used to provide the visual HUD feedback.
Pressurized Brine Solution: Used as a tempering agent to ensure the fins can withstand abyssal depths.
Conductive Adhesive: A waterproof bonding agent used to secure the silver veins to the polymer base.

Tools Required

Vacuum-Molding Chamber: A specialized tank used to shape the polymer around a fin-template without introducing air bubbles.
Micro-Scribe Stylus: A precision tool for carving the “Flow-Logic” channels into the membrane.
Silver-Spinning Wheel: Used to draw the silver-inlay into the hyper-fine veins required for the 442 series.
Hydro-Static Pressure Gauge: To calibrate the fins’ Pressure-Value Index sensors.
Ultrasonic Welder: To fuse the silver veins into the polymer structure without melting the delicate membrane.

Skill Requirements

Aquatic Artifice (Tier 1): The ability to work with materials that change density and behavior when submerged.
Fluid Dynamics Calculus: Understanding how water moves across surfaces to optimize the “Gold-Wake” sensors.
Runic Bookkeeping: Proficiency in the specific shorthand used to program the Liquidity Shift active magic.

Crafting Steps

Template Casting: Place the avatar’s fin-mold (or a standard anatomical model) into the Vacuum-Molding Chamber. Pour in the Alchemical Polymer Resin and evacuate the air to ensure a glass-smooth finish.
Logic Etching: Once the polymer has partially cured to a “tacky” state, use the Micro-Scribe Stylus to etch the “Silver-Inlay Vein” patterns. These patterns must follow the natural flow of water to maximize data collection.
Vein Placement: Thread the Silver-Inlay Wire into the etched channels. Every intersection of wires must be secured with the Conductive Adhesive to form a complete mathematical circuit.
Pigment Infusion: Inject the Teal Bioluminescent Pigment into the “Status-Nodes” at the tips of the fins. This provides the visual interface for the Pressure-Value Index.
Membrane Lamination: Apply a second, thinner layer of polymer over the silver veins. Use the Ultrasonic Welder to fuse the two layers into a single, seamless membrane.
Deep-Sea Tempering: Submerge the completed fins in the Pressurized Brine Solution. Gradually increase the pressure to 50 atmospheres over six hours to “seat” the internal sensors.
HUD Calibration: Activate the fins in a testing tank. Drop various trade goods (shells, coins, scrap) past the fins. Adjust the tension of the silver veins until the teal glow matches the pre-set “Market-Value” frequencies.
Bio-Bonding Prep: Apply a final coating of “Skin-Safe Catalyst” to the interior of the fins. This ensures that when the avatar slides them on, the 442s will shrink-fit perfectly to their natural anatomy.

Foot-Wing-Membrane-of-Clear-Water and Fish-Prince Who Summed Ocean

In the cycle of the Great-Dampness, when the Sky-Islands were yet soft as the belly of a tadpole, and the Deep-Dark-Salt-Place was the only kingdom of the True-Breath, there lived a Fin-Lord named Gill-Zah. In the throat-clicks of the First-Wet-Tongue—a language now drowned by the silt of eternity—Gill-Zah is transcribed as “He-Who-Tastes-the-Weight-of-the-Blue.”

Gill-Zah was a collector of the “Cold-Currents,” where the pressure is so heavy it turns the soul into a diamond. He was not satisfied with the simple snap of the jaw at the passing worm. He possessed a mind like the migration of the eels: thousands of silver paths all seeking the “Final-Account.”

“The Great-Blue is a messy ledger,” Gill-Zah bubbled to the Whale-Gods. “The reefs grow without a tax-stamp, and the tides bring in the driftwood without a manifest of the shore. I shall wrap my fins in the ‘Skin-of-Logic’ so the sea may no longer hide its debts from me.”

He swam to the Deep-Sump of the 44th Trench, where the “Alchemical-Teal” grows in the heat of the world’s-bottom-fires. He took the “Silver-Screams” of the mountain-roots and wove them into the veins of a ghost-membrane. He did not use a needle of coral; he used a “Needle of Calculated-Fluidity.” He bonded the Fins-442 to his own meat using the “Sticky-Water” of the ageless kelp-forests.

The papyrus of this tale is much chewed by the sea-snails here, making the words faint and slippery. It says Gill-Zah became the “Master of the Liquid-Asset.” When he beat his fins, the silver-veins glowed like the moon-on-waves, and the ocean revealed its “Underwater-Prices.” He saw the “Dividend-of-the-Plankton” and the “Interest-Rate-of-the-Gulf-Stream.” He was the first who could tell you the exact profit of a shipwreck before the gold had even touched the sand.

But the ancient translation turns dark like a disturbed ink-sack. It says Gill-Zah became a prisoner of the “Perfect-Stroke.” He looked upon the Great-Coral and saw only a “Depreciating-Habitat.” He looked upon the dancing of the jelly-fish and saw only an “Inefficient-Spending-of-Calories.” He forgot the “Song of the Current,” for his ears were filled with the “Tink-Tink-Tink” of the silver-veins counting the cost of his own heartbeat.

One day, a “Market-Void” opened in the Abyss—a place where the water had no value and the currents moved in “Bankruptcy.” Gill-Zah’s fins began to hum with a frantic, cold frequency. The 442-membranes stretched and throbbed, trying to index the Nothingness, trying to find the “Receipt of the Silence.”

He swam until his fins became as stiff as frozen glass. He saw a thousand routes to the surface, but each one cost more “Kinetic-Wealth” than his soul could borrow. The story says he dissolved into a cloud of teal bubbles, whispering the “Last-Inventory.” When the tides turned, the mer-folk found only a single, silver-veined skin clinging to a rock. Gill-Zah had “Liquidated Himself into the Deep,” becoming a number so thin it could pass through the gaps in a net.

The story is bubbled by the reef-elders to every young hatchling who desires the Ledger-Fins. They say that if you count the cost of every swim, you will eventually find the ocean too expensive to live in.

The Moral of the Story: The swimmer who spends his life counting the drops of the sea will eventually drown in the math, for the true wealth of the water is the freedom to drift where the ledger cannot follow.

Suggested conversions to other systems:

Call of Cthulhu (7th Edition)

Artifact Name: The Membranous Shrouds of the Deep Auditor

These alchemical polymer sleeves are often associated with the “Lloigor-touched” or remnants of Pre-Human aquatic civilizations that viewed the ocean as a biological commodity.

Item Type: Artifact / Attire
Specific Mechanics:
- Hydro-Accounting: Grants a Bonus Die to Appraise, Science (Oceanography), and Navigate checks while submerged in saltwater.
- Pressure-Value Index: The user instinctively knows the depth and the “monetary potential” of any shipwreck or ruins within 100 yards. This grants a Bonus Die to Spot Hidden when searching for valuables underwater.
- Liquidity Shift: The user may spend 4 Magic Points to release a swirl of silver bubbles. For the next 1d10 minutes, the user can “see” the exact number of coins or precious stones carried by any creature within 20 yards.
Sanity Cost: 1/1d4 SAN. Viewing the majestic ocean solely as a series of spreadsheets causes a cold, clinical detachment from nature.
Syntax Note: Follows 7th Edition Bonus Die and MP expenditure logic.

Blades in the Dark

Item Name: Fine Leech-Fins of the Canal Actuary

Specialized Gear (Load: 1) used by aquatic specialists or Bluecoats patrolling the ink-black waters of the canals.

Item Tier: I (Quality)
Mechanics:
- Fine Quality: This item provides Potency when swimming in treacherous currents or contaminated industrial runoff.
- The Current Tally: When you Survey or Study a waterway to track a target or locate submerged contraband, you gain +1 Effect.
- Solvency Shield: You may expend 1 Armor (Special Gear) to resist a consequence related to cold, drowning, or being slowed while in the water. The silver veins pulse, providing a momentary burst of “Kinetic Capital” to break free.
Syntax Note: This item is “Fine” quality and consumes 1 Load.

Dungeons & Dragons (5th Edition)

Item Name: Fins 442 of the Liquidated Ledger

Wondrous item, common (requires attunement by a creature with a swimming speed)

Item Description: These translucent teal membranes wrap around your fins, pulsing with silver light as you navigate the currents.
Passive: Hydro-Accounting: You have advantage on Intelligence (Investigation) checks to find treasure or hidden passages while underwater. Additionally, you always know your current depth and the direction of the nearest high-value trade route.
Active: Liquidity Shift: As an action, you spin in the water, releasing silver bubbles. For 1 minute, you can see the “wealth signature” of any creature within 30 feet of you, revealing the general value of their carried currency (e.g., “Destitute,” “Wealthy,” “Aristocratic”). Once used, you cannot do so again until you finish a short or long rest.
Active: Solvency Shield: When an effect would reduce your speed or move you against your will while underwater, you can use your reaction to stiffen the membranes. You ignore the effect and move up to 10 feet in a direction of your choice.
Syntax Note: Uses standard 5e Action Economy and Attunement.

Knave (2nd Edition)

Item Name: Auditor’s Webbing

In the rugged, item-focused world of Knave, these fins turn the wearer into an expert salvage-tracker.

Item Slots: 1 (Worn over fins/feet)
Quality: 4
Mechanics:
- Pressure-Value Index: The wearer always knows the “Market Price” of any raw material or treasure found underwater.
- Hydro-Accounting: The wearer has Advantage on any check to navigate or survive in aquatic environments.
- Liquidity Shift: Once per day, the wearer may flare their fins to perceive the exact inventory (items and coins) of one creature within line of sight underwater.
Syntax Note: Occupies one inventory slot; utilizes Advantage and Quality (Durability) mechanics.

Fate (Core/Condensed)

Name: The 442 Hydro-Audit Membranes

Type: Extra (Requires an Aspect related to aquatic heritage or a Swim speed)
Functional Aspect: Bio-Synced Ledger Membranes
Stunts:
- Hydro-Accounting: Because I have the 442 Hydro-Audit Membranes, I get a +2 to Investigate rolls when I am submerged and searching for hidden treasure, sunken cargo, or mineral wealth.
- Liquidity Shift: Once per scene, I can flare my fins to create a scene Aspect called Full Financial Disclosure. This represents the silver bubbles identifying the exact gear and wealth of everyone in the zone, providing one free invoke.
- Solvency Shield: I can spend a Fate Point to ignore any physical movement penalties or “Slow” effects caused by water pressure or cold-based hazards, gaining a +2 to Athletics for the remainder of the exchange instead.
Cost: 1 Refresh.

Numenera & Cypher System

Name: Abyssal Liquidation Vanes (Artifact)

Level: 1d6 (Level 4 typical)
Form: Translucent teal sleeves that bond to fins or a tail.
Effect:
- Aquatic Appraisal: The wearer is Trained in all tasks involving navigation, swimming, and identifying the value of artifacts found underwater.
- Depletion: 1 in 1d20 (Check only when using Active powers)
- Active: Liquidity Shift: The wearer releases a burst of silver bubbles. For the next hour, they gain an Asset to all tasks involving social interaction with aquatic creatures by identifying their “status” via their carried wealth.
- Active: Solvency Shield: If the wearer is targeted by a cold-based attack or an effect that would hinder their movement, they can spend 3 points from their Speed pool to negate the penalty and move their normal speed as part of the defense. Roll for depletion.
Syntax Note: This artifact occupies the “Fins” slot and requires immersion in water to function.

Pathfinder (2nd Edition)

Name: Fins 442 of the Liquidated Ledger

Item Level: 1
Price: 18 Silver Pieces
Usage: Worn (Fins); Bulk: L
Description: These alchemical polymer membranes reinforce your natural fins, glowing with silver veins that track the flow of “Liquid Assets.”
Traits: Divination, Investigation, Magical, Water.
Mechanics:
- Hydro-Accounting: You gain a +1 item bonus to Perception checks to find hidden treasure and Survival checks to navigate while underwater.
- Active: Liquidity Shift (Two Actions): (Divination, Visual, Water) Effect: You release a 20-foot emanation of silver bubbles. You learn the approximate value of all items and currency carried by creatures in the area. This grant you a +1 circumstance bonus to Diplomacy or Intimidation checks against those creatures for 1 minute.
- Active: Solvency Shield (Reaction): Trigger: An effect would give you the Clumsy or Paralyzed condition while you are in water. Effect: You stiffen your fins. You ignore the condition’s penalty to your movement speed and gain a +10-foot status bonus to your Swim speed until the end of your next turn.
Syntax Note: Follows standard 2e trait and action economy rules.

Savage Worlds (Adventure Edition)

Name: 442 Ledger Fins

Type: Personal Gear (Fins Slot)
Weight: 1 lb (Negligible in water)
Mechanics:
- Hydro-Accounting: The wearer gains a +2 bonus to Notice and Research rolls when searching for sunken objects or assessing the value of aquatic resources.
- Pressure-Value Index: The wearer ignores up to 2 points of penalties related to high-pressure environments or deep-water swimming.
- Active: Liquidity Shift: As a limited free action, the wearer may flare their fins. They make a Notice roll; on a success, they identify the “Gear Level” and approximate wealth of all targets within 5″ (10 yards).
- Active: Solvency Shield: If the wearer is affected by a “Slow” or “Entangle” effect while submerged, they may spend a Bennie to automatically break free and move their full Pace plus a d6.
Syntax Note: These are considered “Aquatic Augmentation Gear.”

Shadowrun (6th World Edition)

Name: Hydro-Data Vanes (Qi Focus)

In the flooded districts of neo-metropolises or the aquatic hubs of Saṃsāra, these polymer sleeves allow an Adept to process the “Aetheric Current” of commerce while submerged.

Item Type: Qi Focus (Rating 1)
Availability: 4(I)
Cost: 5,500¥
Mechanics:
- Hydro-Accounting: While the focus is active and the user is submerged, they gain a +1 dice pool bonus to Athletics (Swimming) and Perception tests.
- Liquidity Shift: The user can spend a Minor Action to release a burst of silver bubbles. This grants the user a +1 dice pool bonus on Negotiation or Intimidation tests against aquatic targets by revealing their “Financial Weaknesses” in AR.
- Solvency Shield: When the user would be affected by a “Slow” or “Bind” status effect while underwater, they may spend 1 point of Edge to negate the status and gain a +2 bonus to their Defense Rating for the remainder of the round.
Syntax Note: Requires Bonding Karma equal to (Rating x 2).

Starfinder (2nd Edition / Playtest)

Name: 442 Series Flow-Ledger

This hybrid gear utilizes bioluminescent polymer and silver micro-circuitry to turn aquatic movement into a digital appraisal system.

Level: 1
Price: 240 Credits
Hands: 0 (Worn over fins)
Bulk: L
Traits: Hybrid, Magical, Tech, Water.
Mechanics:
- Passive: Pressure-Value Index: You gain a +1 item bonus to Survival checks to navigate underwater and Perception checks to Seek hidden objects or treasure.
- Active: Liquidity Shift (Two Actions): (Envision, Tech, Water) You release a 20-foot emanation of silver bubbles. You learn the approximate value of all items and currency carried by creatures in the area. Until the start of your next turn, you have Advantage on the next check you make to interact socially with a creature affected by this ability.
- Active: Solvency Shield (Reaction): Trigger: You are targeted by a cold-based attack or an effect that would reduce your speed while in water. Effect: You gain a +2 circumstance bonus to your AC or Save against the trigger. If you succeed, your Swim speed increases by 10 feet until the end of your next turn.

Traveller (Mongoose 2nd Edition)

Name: TL 6 Sub-Aquatic Metric Fins

These fins incorporate micro-sensors that filter seawater for metallic particulates, identifying the “wealth signatures” of submerged wrecks.

Tech Level: 6
Weight: 1 kg
Cost: Cr 1,400
Mechanics:
- Metric Navigation: The wearer receives a DM+1 to any Athletics (Swimming), Navigation, or Broker check made while submerged.
- The Current Tally: The internal sensors act as a biological metal detector. The wearer gains a Boon to Electronics (Sensors) checks to find metallic objects or currency underwater.
- Solvency Shield: Once per encounter, if an environmental effect (like a current or pressure trap) would force the wearer to move, they may make a Difficulty 8 Athletics check to stay stationary and gain a Boon to their next action.
Syntax Note: Requires a Standard Power Cell (1 year duration).

Warhammer (Age of Sigmar: Soulbound)

Name: Aether-Veined Fin-Shrouds

Favored by the Isharann of the Idoneth Deepkin or those auditing the sea-lanes of Chamon, these shrouds treat the ocean as a fluid vault.

Availability: Common
Cost: 350 Drops
Mechanics:
- Hydro-Accounting: You have Advantage on Mind (Survival) and Mind (Appraise) tests made while underwater.
- Liquidity Shift: As a Free Action, you flare your fins to release silver bubbles. You learn the current Toughness and Armor of all enemies within Short Range that are also submerged.
- Solvency Shield: When you take the Defend Action while swimming, you may release a cloud of “Kinetic Capital.” Enemies have Disadvantage on attacks against you until the start of your next turn, and if they miss, you may move up to your Speed as a Free Action.
Syntax Note: This item is an Adornment (Fins/Feet slot).