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Piston-Driven Wrist Bolt 551

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by

Dale
in

From: Lineage 1083 of the Iron-Sheath Gestalt

Slot: Arm (Fixed)

Description: A compact, steam-powered projectile launcher integrated directly into the left gauntlet. It fires heavy, blunt-tipped rhodium bolts designed to dent plate armor or shatter stone at a Simple (15) range. The loading mechanism is synchronized with the creature’s internal magic circuits, allowing for a quick-reload action that draws from a wrist-mounted magazine holding five bolts.

Lore: Piston-Driven Wrist Bolt 551

The 551-series is a hallmark of the Seismic-Caster Union, originally engineered for the deep-core surveyors of the Glimmer-Basalt Islets. In the crushing pressures of the subterranean megacities, traditional bows and mechanical crossbows were found to be too fragile, their limbs often snapping under the atmospheric stress or failing to penetrate the reinforced carapaces of feral rock-borers. The Piston-Driven Wrist Bolt was the solution: a weapon that treats the projectile not as a flying arrow, but as a kinetic extension of the user’s own momentum.

The core of the 551 is a miniature, high-pressure steam cylinder forged from Cinder-Iron. It does not rely on tension, but on the violent expansion of mana-infused steam triggered by a pulse from the avatar’s magic circuits. The rhodium bolts are unique; their density is so high that they do not deform upon impact, ensuring that the kinetic energy is transferred entirely into the target’s structural frame. Among the aristocratic enforcers of the Vapor-Spire Metropolises, the 551 is often customized with gold filigree and ivory grips, serving as a “gentleman’s equalizer” in the political intrigue of the high courts. It is a weapon of sudden, overwhelming force—a mechanical “punch” that can be delivered from across a room with enough force to halt a charging beast or buckle a heavy iron gate.

Item Specifications

  • Tier 1 Stats
    • Attack Power: 24
    • Impact Force: 35
    • Effective Range: 15 (Simple)
    • Weight: 4.2 lbs
    • Magazine Capacity: 5 Bolts
  • Skills Gained (While Openly Worn or Held)
    • Ballistic Calculation (Temporary): 3
    • Pneumatic Maintenance (Temporary): 2
  • Passive Magic
    • Sync-Load: The loading mechanism reads the user’s magic flow, reducing the time required to chamber a new bolt to a near-instantaneous reflex.
    • Kinetic Anchoring: While the gauntlet is armed, the user gains a +4 bonus to stability checks against being knocked prone or pushed, as the weapon’s weight and internal gyros assist in grounding the avatar.
    • Rhodium Resonance: The bolts are naturally resistant to magical displacement; they cannot be deflected or slowed by basic Abjuration shields or wind-based magic.
  • Activatable Magics
    • Pressure-Redline: (Action) The user forces a surge of elemental fire into the steam cylinder. The next shot has double the range and treats the target’s Armor as if it were two tiers lower, but the gauntlet must “Vent” for one minute afterward, becoming unusable.
    • Seismic Pulse: (Action) Instead of firing a bolt, the user triggers the piston against a solid surface (like a floor or shield). This creates a 10-foot radius shockwave that forces all Tier 1 creatures to make a Stability check or be knocked prone.
  • Specific Slot: Arm (Fixed)
  • Tags: Steam-Powered, Kinetic, Rhodium-Tipped, Gauntlet-Integrated, Mid-Range, High-Impact, Seismic, Automaton-Grade, Tier-1, Quick-Reload, Fixed-Attachment, Armor-Cracker, Pneumatic-Drive, Heavy-Blunt, Cinder-Iron, Recoil-Compensated, Wrist-Mounted, Shock-Inducing, Impact-Hammer, Mana-Vented, Breach-Loader, Rapid-Cycle, Force-Multiplier

Procurement and Commerce of the Piston-Driven Wrist Bolt 551

Methods of Acquisition

The Piston-Driven Wrist Bolt 551 is a piece of regulated industrial hardware, typically found in areas where heavy labor or high-stakes enforcement is common.

  • Seismic-Caster Union Requisition: Most 551 units are issued directly to certified surveyors and demolition specialists working in the deep-core mines. Obtaining one usually requires a “Laborer’s Permit” or proof of apprenticeship within the Union.
  • Salvage from Basalt Hubs: In the dark cave systems and megacities where ancient mining outposts have been overrun by feral beasts, these gauntlets can sometimes be recovered from the skeletal remains of past surveyors. Because rhodium does not tarnish, the internal piston is often still functional even if the leather straps have rotted away.
  • Custom Commissions: Skilled steam-smiths in metropolises can manufacture a 551 if provided with the necessary Cinder-Iron and Rhodium ingots. This is the primary way Isekai characters with memories of ballistic weaponry acquire them.

Commercial Environments and Market Dynamics

Trading a 551 involves visiting merchants who deal in “Heavy Utility” or “Personal Defense” categories. Because the 551 is a fixed arm attachment, the buying process often involves a fitting session with a mechanic.

  • The Union Foundry Store (Industrial Districts): These are strictly regulated shops located near mining elevators or factory gates.
    • Buying: A standard-issue 551 costs approximately 2,200 Gold. The transaction is recorded in the local registry, and the price includes a basic crate of twenty rhodium bolts.
    • Selling: The Union will buy back a 551 from a retiring or injured worker for 1,000 Gold, provided the steam seals are not warped.
  • The Gear-Head Emporium (Metropolises): Found in the sprawling skyscraper districts, these shops cater to mercenaries, adventurers, and wealthy hobbyists.
    • Buying: Due to the “sellers’ market” in high-population centers, a polished or silver-filigree 551 can cost upwards of 3,500 Gold. Buyers pay a premium for comfort-grade interior padding and “quick-snap” magnetic magazines.
    • Selling: These shops are always looking for stock and will pay 1,400 Gold for a functioning unit, though they will deduct value for any “Mind’s Eye” feedback residue on the magic circuits.
  • The Frontier Scrapper (Island Outposts): These are cluttered, grease-stained shacks found on the smaller, uncharted islands or at the edge of the back woods.
    • Buying: You might find a “surplus” or “battle-worn” 551 here for a bargain price of 1,200 Gold. However, the “buyer beware” philosophy is in full effect, as these units may have a 5% chance of the steam cylinder sticking during a “Pressure-Redline” activation.
    • Selling: A scrapper will rarely offer more than 500 Gold, often citing the “high cost of access” to replacement parts as a reason for the low offer.

Transactional Costs

In the more civilized island countries, a “Fixed-Weaponry License” is required to wear a 551 in public spaces, costing roughly 75 Gold per year. Furthermore, the specialized rhodium bolts are an ongoing expense; a magazine of five bolts typically costs 25 Gold in industrial areas, but can reach 60 Gold in remote frontier outposts where rhodium is scarce. Most reputable sellers also charge a Surgical Integration Fee of 50 Gold to properly synchronize the gauntlet’s magic circuits with the buyer’s internal flow.

Strategic Utility and Roleplay of the Piston-Driven Wrist Bolt 551

The Piston-Driven Wrist Bolt 551 is a weapon of sudden, violent momentum. Roleplaying with this fixed attachment emphasizes the mechanical weight on the avatar’s arm, the sharp hiss of escaping steam, and the physical recoil that must be managed during combat.

Combat Roleplay: Offensive Maneuvers

Offensively, the 551 is used as a “breaching” weapon, intended to break the momentum of an enemy or shatter their defensive posture with heavy kinetic energy.

  • The Point-Blank Piston-Punch: When an enemy closes into melee range, roleplay the “Seismic Pulse.” Describe the avatar bracing their feet and thrusting their left gauntlet forward. Instead of a standard punch, roleplay the thumb-trigger clicking, followed by a thunderous thump-hiss as the piston fires a rhodium bolt directly into the enemy’s center of mass. The roleplay should focus on the target being physically lifted or folded backward by the sheer blunt force.
  • Pressure-Redline Sniping: In mid-range skirmishes, roleplay the “Ballistic Calculation” skill. Describe the avatar’s Mind’s Eye projecting a faint, vibrating trajectory line through the steam-haze. Roleplay the deliberate act of “redlining” the cylinder—the gauntlet beginning to glow a dull orange and emit a high-pitched whistle—before unleashing a bolt that strikes with the force of a falling boulder, punching through a rival’s shield or armor plate as if it were parchment.

Combat Roleplay: Defensive Maneuvers

Defensively, the 551 is used to deny space and create “kinetic zones” that discourage attackers from approaching.

  • Suppressive Hammering: When overwhelmed by multiple Tier 1 feral beasts, roleplay the “Quick-Reload” action. Describe the rhythmic clack-hiss, clack-hiss of the internal magazine cycling bolts into the chamber. The avatar fires into the ground or nearby structures, using the “Rhodium Resonance” to ensure the bolts don’t deflect, creating a barrier of dust and shattered stone that halts the enemy’s advance.
  • Stabilized Bracing: When facing a heavy charge or a knock-back effect, roleplay the “Kinetic Anchoring.” Describe the avatar slamming their left gauntlet into the earth or a wall, the internal gyros whining as they compensate for the impact. Roleplay the steam venting from the wrist-ports to provide counter-thrust, allowing the avatar to remain an immovable object against an incoming force.

Roleplay in Extreme Environments

  • Subterranean Megacities: In the enclosed, high-pressure environments of the deep-core mines, roleplay the “Acoustic Thunder.” Every shot of the 551 sounds like a structural collapse, the echoes bouncing off the basalt walls for several seconds. Describe how the “Pneumatic Maintenance” skill is essential here, as the avatar must constantly clear stone-dust from the steam-ports to prevent a backfire.
  • Vapor-Spire Metropolises: In the high-society skyscrapers, the 551 is roleplayed with “Hidden Lethality.” Describe the avatar keeping the gauntlet tucked beneath a heavy cloak or formal sleeve, the low thrum of the steam-pilot light being the only warning. Roleplay the social tension of “accidental” activation during a heated political negotiation, where the mere sound of the piston priming can end a conversation.
  • Floating Cities and Airships: On the swaying decks of a Zeppelin, roleplay the “Recoil Management.” Describe the avatar timing their shots with the roll of the ship, using the 551 to snap the rigging of a pursuing vessel or to shatter the steering-fins of a rival’s griffon-saddle. The roleplay should emphasize the danger of the “Pressure-Redline” kick-back potentially throwing the wielder off the edge of the deck.

Perception of Activation:

User’s Perspective

When the Piston-Driven Wrist Bolt 551 is triggered, the avatar is subjected to a “Kinetic Shockwave.” Through the Mind’s Eye, the user perceives a sudden, sharp vacuum in their own magic circuits as the “Sync-Load” siphons mana to superheat the internal water chamber. The physical sensation is intense: a rapidly building, localized heat along the left forearm, followed instantly by a bone-jarring backward jerk as the piston fires. Extra-sensory “Trajectory Mapping” flashes a brief, bright line of force in the user’s consciousness, connecting the gauntlet to the point of impact. The avatar’s olfactory sensors are flooded with the smell of scorched cinder-iron, ozone, and the distinct, coppery scent of high-velocity rhodium.

Observer’s Perspective

To an onlooker, the activation is less like a weapon firing and more like a localized explosion. There is no string-twang of a bow; instead, there is a momentary flare of amber light from the gauntlet’s circuits, immediately followed by a deafening, bass-heavy CRACK-HISS. A violent burst of white, high-pressure steam erupts from the wrist vents, momentarily obscuring the user’s arm. Observers close by will feel a physical thump in their chests from the displaced air, and the rhodium bolt moves so quickly it appears only as a dark, blurred streak before the target violently crumples or shatters under the kinetic impact.

Positives

  • Instantaneous Force: The weapon requires no wind-up or physical swing, allowing the avatar to deliver crushing blunt-force trauma from a static or defensive posture.
  • Unflinching Delivery: The “Kinetic Anchoring” ensures that even while firing a massive projectile, the user’s center of gravity remains stabilized, preventing them from being thrown off balance by their own weapon.
  • Psychological Shock: The sheer volume and concussive force of the activation can disorient or frighten unprepared enemies, breaking their combat focus.

Negatives

  • Joint Degradation: The violent recoil of the pneumatic piston puts immense, unnatural strain on the user’s elbow and shoulder servos; repeated use without proper maintenance can cause micro-fractures in the arm bones or mechanical joints.
  • Sensory Overload: The acoustic blast is loud enough to cause temporary deafness or severe tinnitus, rendering the user’s audio-receptors useless for several seconds after a shot.
  • Complete Loss of Stealth: The bright amber flash, the thunderous noise, and the lingering cloud of white steam make it impossible to use the 551 covertly, instantly alerting every entity in the immediate sector to the user’s exact location.

Schematic for the Piston-Driven Wrist Bolt: Series 551

Materials Needed

  • 3 Cinder-Iron Ingots: Requires extreme heat to shape but provides the necessary tensile strength to contain high-pressure magical steam without fracturing under the stress of the piston firing.
  • 5 Rhodium Billets: Used exclusively for forging the solid, blunt-tipped heavy bolts. Rhodium’s extreme density ensures the kinetic transfer does not deform the projectile upon impact.
  • 1 Elemental Water-Fire Matrix Core: A small, stabilized crystal that continuously produces rapid-expansion steam when stimulated by an influx of mana.
  • 2 Yards of Deep-Cavern Basilisk Hide: Thick, heat-resistant leather required to line the interior of the gauntlet to protect the user’s arm from thermal bleed and severe chafing during recoil.
  • Heavy Brass Fastenings and Buckles: Needed to securely anchor the heavy gauntlet to the user’s forearm and prevent it from dislocating the wearer’s joints upon firing.
  • Alchemically Treated Kraken-Rubber Seals: To ensure the steam cylinder remains airtight and does not vent pressure prematurely.
  • High-Tension Steel Springs: For the internal magazine feeding mechanism to push heavy rhodium bolts into the firing chamber automatically.
  • Refined Copper-Mana Threading: Essential for inlaying the sensory circuits that connect the weapon’s trigger to the user’s internal magic flow.

Tools Required

  • High-Heat Blast Forge: Standard coal forges cannot reach the temperatures required to properly temper Cinder-Iron.
  • Steam-Powered Trip-Hammer: Necessary for shaping the heavy Cinder-Iron plates into the curved gauntlet housing.
  • Precision Bore-Drill: A diamond-tipped rotational drill required to hollow out the perfect, smooth cylinder for the firing piston.
  • Arcane Etching Stylus: A specialized jeweler’s tool used to carve the micro-trenches for the copper-mana threading.
  • Pneumatic Pressure Testing Rig: A heavy iron enclosure used to safely test the steam cylinder’s maximum threshold before strapping it to a living limb.
  • Heavy Anvil, Tongs, and Shaping Hammers: Standard requirements for heavy metallurgy and riveting.

Skill Requirements

  • Heavy Metallurgy (Advanced): Level 4 required to ensure the Cinder-Iron is tempered perfectly. If the tempering is flawed, the gauntlet will explode upon the first “Pressure-Redline” activation.
  • Pneumatic Engineering (Trained): Level 3 required to correctly calibrate the expansion rates of the steam cylinder and the release valve for the heavy piston.
  • Arcane Circuitry Weaving (Trained): Level 2 required to properly sync the copper-mana threads with a general soul-core frequency, allowing the “Sync-Load” passive magic to function.

Crafting Steps

  • Step 1: Forging the Main Housing. Heat the Cinder-Iron ingots in the blast forge until they glow a bright, blinding white. Use the steam-powered trip-hammer to flatten and curve the metal into a thick, cylindrical vambrace that fits the dimensions of a forearm. Leave the outer edge flat to serve as the mounting plate for the firing mechanism.
  • Step 2: Boring the Steam Cylinder. Take a solid block of tempered Cinder-Iron and lock it securely into place. Use the precision bore-drill to slowly carve a perfect, frictionless tunnel through the center. This will serve as the housing for the pneumatic piston. Any burrs or imperfections inside this cylinder will shred the kraken-rubber seals.
  • Step 3: Crafting the Firing Piston and Matrix. Lathe a heavy iron rod to fit exactly inside the bored cylinder. Attach the alchemically treated kraken-rubber seals to the base of the piston. At the rear of the cylinder, install the Elemental Water-Fire Matrix Core, ensuring the intake valves align perfectly with the pressure chamber.
  • Step 4: Circuitry and Synchronization. Use the arcane etching stylus to carve the circuit paths along the exterior of the gauntlet housing. Carefully inlay the refined copper-mana threading into these grooves. The primary circuit must connect the user’s wrist pulse-point to the matrix core, while secondary circuits run along the side to power the “Sync-Load” magazine mechanism.
  • Step 5: Magazine Assembly. Weld a rectangular iron box to the side of the main housing. Install the high-tension steel springs at the base. Forge the five rhodium billets into perfectly aerodynamic, blunt-tipped cylinders and load them into the magazine. The spring mechanism must align the top bolt directly over the breech of the steam cylinder.
  • Step 6: Final Assembly and Padding. Rivet the completed steam cylinder and magazine array onto the main gauntlet housing. Cut the deep-cavern basilisk hide to fit the interior of the vambrace, securing it with the heavy brass fastenings and buckles. Ensure the leather padding is thickest around the wrist and elbow joints to absorb the massive recoil.
  • Step 7: Calibration and Pressure Testing. Lock the fully assembled 551 unit into the pneumatic pressure testing rig. Channel mana into the copper threads from a safe distance to activate the steam matrix. Cycle all five rhodium bolts through the weapon to verify that the “Sync-Load” mechanism chambers rounds flawlessly. Finally, push the matrix to maximum output to ensure the cylinder can withstand the “Pressure-Redline” without catastrophic structural failure.

Heavy-Arm-Tube 551

This is the writing that was scratched into the flat-stones by the dirt-dwellers who never saw the sky-fire. In the days of the deep-down, the dirt-dwellers were chewing the bones of the world in the places of the Black-Shine Islands. The heavy-air of the deep-down was like water in the lungs, and the darkness was thick like the mud of winter. The dirt-dwellers were doing a great digging to find the magic-rocks that sleep in the stone. But the stone was not empty. The many-legged rock-eaters lived in the deep-down. They had faces made of grinding-teeth and shells that laughed at the sharp-sticks of the dirt-dwellers.

When the rock-eaters came to make a meat-feast of the diggers, the diggers tried to use the bending-sticks with strings to throw the feather-needles. But the heavy-air of the deep-down hated the bending-sticks. The strings would turn to rot, and the wood would snap into sad splinters. The feather-needles would bounce off the rock-eaters like rain on a turtle. The dirt-dwellers were doing much weeping and becoming the food.

There was a hammer-man named Gar of the Soot-Beard. Gar was very angry at the eating of his friends. He spoke loud words with his face-hole, shouting to the cave walls. He said, “I will not use the bending-stick. I will build the metal-fist that punches from the across-room. It will not have strings to rot.” Gar went to the fires that burn the earth-blood. He took the black stubborn-iron that hates to bend. He beat the stubborn-iron for many sleep-times until it made a hollow tree-trunk for his meat-branch. It was a heavy metal skin for the left arm.

But the metal skin needed a thing to spit. Gar looked at the normal iron, but he said, “No, it is too soft, like the old bread.” He went deeper into the bad-dark and found the silver-heavy-dirt. The silver-heavy-dirt was so dense that a piece the size of a thumb weighed as much as a fat dog. Gar shaped the silver-heavy-dirt into five blunt-fingers. They did not have the cutting-edges. They only had the flat faces of stopping-the-walking.

To make the metal skin spit the blunt-fingers, Gar needed a great pushing. He could not use the exploding-powder, because it would collapse the ceiling-rocks and make everyone flat. He captured the angry-water-ghosts inside a matrix-stone. When the life-water of the body touched the matrix-stone, the angry-water-ghosts would make the violent white-breath. Gar trapped the violent white-breath behind a heavy iron sliding-plug. He put the silver blunt-finger in front of the sliding-plug. He built a box on the side to hold the other four blunt-fingers, with a snake of metal to push them down when the chamber was empty.

The time of testing came quickly, because the Grandfather of Rock-Eaters smelled the sweat of Gar. The Grandfather was big like a house of stone, and its legs made the ground shake the fear into the boots of the dirt-dwellers. The diggers ran away with great screaming. Gar did not run. He strapped the metal skin to his arm. It was so heavy that his shoulder cried the pain-tears.

The Grandfather of Rock-Eaters opened its cave-mouth to swallow Gar in one biting. Gar pointed his arm. He let his life-water touch the matrix-stone. The copper veins on the metal skin glowed like the angry morning. Gar pushed the trigger-bone.

The angry-water-ghosts escaped with a noise that broke the hearing-drums of everyone in the deep-down. It was the sound of the world splitting its skin. A violent white-breath exploded from the arm-vents, hiding Gar in a hot cloud. The iron sliding-plug slammed forward. The silver blunt-finger was spat out faster than the thought of a god. It did not fly like a bird; it dragged the heavy-air with it.

The silver blunt-finger hit the Grandfather of Rock-Eaters exactly in the middle-face. There was no cutting. There was only the great breaking. The shell of the beast shattered like a dropped clay cup. The kinetic-anger of the blunt-finger folded the monster backwards until its front touched its back. The Grandfather of Rock-Eaters was dead before it understood it was no longer alive.

But the great pushing of the metal skin demanded a great pushing-back. The arm of Gar was thrown behind him with the force of a kicking mule. Gar flew through the heavy-air and hit the hard wall. His meat-branch was broken in four places, and his shoulder was no longer in its socket. The metal skin hissed the white-breath, clicking loudly as the snake of metal pushed the next blunt-finger into the chamber.

The dirt-dwellers came back and saw the broken monster. They carried Gar to the healing-beds. They saw the power of the heavy metal skin. They asked Gar how many times he tried to build the matrix-stone before it did not melt his face. Gar said, “Five hundreds and fifty times the fire burned me. This is the one.” So they called it the arm-tube of the Five Hundreds and Fifty and One.

The moral of the story: The heavy stone that crushes the head of the wolf will also break the foot of the man who drops it, for the great striking of the enemy always demands the great shaking of the bones of the striker.

Suggested conversions to other systems:

Call of Cthulhu (7th Edition)

Item Name: The 551-Series Kinetic Vambrace

  • Classification: Weird Science / Heavy Industrial
  • Damage: 2d6 + 4
  • Skill: Firearms (Handgun) or Fighting (Brawl) for point-blank discharge.
  • Malf: 96
  • Game Mechanics:
    • Knockback: Any human-sized target struck by a bolt must make an Extreme STR or DEX roll (target’s choice) or be knocked prone and pushed back 1d4 yards.
    • Armor Cracker: The rhodium bolts ignore up to 5 points of physical armor (ballistic vests, thick hides).
    • Deafening Blast: Upon firing, the user and anyone within 2 yards must succeed on a CON roll or suffer a -10% penalty to all Listen and Occult rolls for 1d10 minutes due to ear-ringing.
    • Fixed Attachment: This item takes 1 full hour to strap on or remove correctly. It cannot be “dropped” if the user is surprised.
  • Syntax: “The heavy rhodium slug strikes with the force of a runaway carriage, leaving a cloud of scalding steam in its wake.”

Blades in the Dark

Item Name: The Union-Grade ‘Piledriver’ Gauntlet

  • Type: Heavy Weapon / Industrial Tool (2 Load)
  • Tier: I (Fine Quality)
  • Mechanics:
    • Heavy Impact: When you Skirmish or Wreck with this weapon, you have Potency against stone, metal, and armored foes.
    • Steam-Recoil: After you fire a bolt, you take Level 1 Harm “Jostled Shoulder” or “Ringing Ears” unless you resist with Prowess.
    • Magazine: The gauntlet holds 5 shots. After 5 shots, you must spend a few moments (an action) to swap the magazine.
    • Anchoring: You may spend 1 Stress to use the “Kinetic Anchoring” passive. For the remainder of the scene, you cannot be forcibly moved or knocked down by physical force.
  • Tags: Loud, High-Force, Fixed, Rhodium-Ammo.

Dungeons & Dragons (5th Edition)

Item Name: Piston-Driven Wrist Bolt 551

  • Weapon (Hand Crossbow), Rare (Requires Attunement)
  • Base Damage: 2d6 bludgeoning
  • Mechanics:
    • Kinetic Impact: On a hit, if the target is Large or smaller, it must succeed on a DC 15 Strength saving throw or be pushed 10 feet away from you and knocked prone.
    • Fixed Attachment: While attuned, this weapon is integrated into your armor or clothing. You cannot be disarmed of this weapon.
    • Steam-Powered Loading: This weapon ignores the loading property. It holds 5 bolts. As a bonus action, you can replace the 5-bolt magazine.
    • Pressure Redline: Once per long rest, you can use an action to “Redline” the cylinder. Your next attack deals an extra 2d6 fire damage and the target has disadvantage on the Strength saving throw. After using this, the weapon is unusable until the end of your next turn as it vents steam.
  • Syntax: “A thunderous hiss precedes the launch of the rhodium bolt, turning the air white with vapor as the target is physically upended.”

Knave (2nd Edition)

Item Name: Wrist-Piston 551

  • Item Slots: 2 (Fixed to Arm)
  • Damage: d10 (Bludgeoning)
  • Mechanics:
    • Armor Crushing: This weapon ignores the first 4 points of an enemy’s Armor rating.
    • Recoil: Every time you fire, you must make a STR save. If you fail, you are knocked prone by the recoil.
    • Ammo: Holds 5 Rhodium Bolts. Reloading takes 1 full round and requires a heat-resistant glove or tool.
    • Steam-Haze: After firing, the user is obscured by steam. The next attack made against the user has a 1-in-6 chance to miss automatically due to the fog.
  • Tags: Heavy, Loud, Fixed, Destructive, Steam-Powered.

Fate (Core/Condensed)

Item Name: The 551 Kinetic Vambrace

  • Type: Extra / Fixed Attachment
  • Aspect: “Bone-Jarring Pneumatic Force”
  • Mechanics:
    • Kinetic Punch: When you use Combat or Physique to attack at range or point-blank, you may invoke the item’s aspect for free once per scene to add +2 to the result or a two-shift hit, provided the target is armored or a construct.
    • Anchored Stance: You gain a +2 bonus to Defend against any action intended to move you from your zone or knock you down.
    • The Price of Power: If you use the “Pressure-Redline” to add a massive bonus (+4) to an attack, the item gains the Compel “Overheated and Venting,” making it unusable for the rest of the scene.
  • Cost: 1 Refresh and 1 available Arm Slot.

Numenera & Cypher System

Item Name: Seismic Wrist-Launcher

  • Level: 1d6 + 2 (Tier 1)
  • Form: A heavy, steam-venting gauntlet fixed to the forearm with rhodium bolt clips.
  • Effect: This medium weapon deals 4 points of damage.
  • Specific Mechanics:
    • Knockback: On a successful hit, the target is pushed back 5 feet. If the d20 roll was a 17 or higher, the target is also knocked prone.
    • Integrated Magazine: The user can fire five times before needing to spend an action to swap the magazine. Swapping the magazine is a routine task (Difficulty 0) because of the “Sync-Load” circuits.
    • Pressure Surge: The user can apply an Effort to increase the damage by 3 points by redlining the steam cylinder. This increases the Depletion roll for that shot.
    • Depletion: 1 in 1d20.
  • Syntax: “A concussive blast of steam accompanies the bolt, transferring massive energy that can buckle plasteel and bone alike.”

Pathfinder (2nd Edition)

Item Name: Piston-Driven Wrist Bolt 551

  • Item 4 | Rare | Evocation | Fire | Magical | Force
  • Price: 90 gp
  • Usage: integrated into gauntlet (arm); Bulk: 1
  • Base Weapon: Hand Crossbow (deals 2d6 B damage)
  • Mechanics:
    • Rhodium Impact: On a successful strike, the target must succeed on a DC 18 Fortitude save or be pushed 5 feet away from the wielder. On a critical success, the push distance is 10 feet and the target is knocked Prone.
    • Steam-Powered Reload [Free Action]: (Frequency: once per turn) Because of the Sync-Load magic circuits, you may Interact to reload the weapon as a free action.
    • Seismic Pulse [Two Actions]: You strike the ground. Every creature in a 10-foot emanation must succeed on a DC 18 Reflex save or fall Prone.
  • Syntax: “The heavy rhodium bolt is accelerated by a violent expansion of magical steam, striking with the weight of a forge-hammer.”

Savage Worlds (Adventure Edition)

Item Name: 551-Series “Piledriver” Gauntlet

  • Type: Ranged Weapon
  • Range: 10/20/40; Damage: 2d8; AP: 4
  • Min Str: d6; Weight: 4 lbs
  • Mechanics:
    • Heavy Kinetic: Targets hit by the bolt are subject to the Push special ability (see Savage Worlds core rules) in addition to taking damage.
    • Fixed: The weapon is strapped to the arm. The wielder cannot be Disarmed, but suffers a -1 penalty to any fine manual dexterity tasks using that hand (such as Picking Locks).
    • Snapfire: Because the weapon is fixed and recoil-compensated, it does not suffer the usual Snapfire penalties if the user moves in the same turn.
    • Reload: 5 shots. Replacing the magazine is a limited free action (once per round).
  • Syntax: “With a thunderous hiss and a jolt that travels up the spine, the wrist-bolt delivers a rhodium slug capable of shattering stone.”

Shadowrun (6th World Edition)

Item Name: Ares-Saṃsāra “Impact-Piston” 551

  • Type: Exotic Ranged Weapon
  • Damage: 5P
  • Attack Rating: 10/8/—/—/—
  • Ammo: 5 (m)
  • Game Mechanics:
    • Kinetic Punch: This weapon yields +2 Edge on Attack tests against targets using Physical Armor or Shields. If the target is hit, they are pushed back 1 meter for every net hit scored.
    • Steam-Venting: After firing, the user receives a -2 penalty to Stealth-based tests for 2 Combat Rounds as a cloud of white vapor persists around the arm.
    • Integrated Bracing: The weapon provides 2 points of Recoil Compensation. Additionally, the user cannot be disarmed of this weapon as it is fixed to the limb.
  • Syntax: “The rhodium bolt is accelerated by a violent pneumatic expansion, hitting with the force of a high-velocity sledgehammer.”

Starfinder (2nd Edition / Playtest)

Item Name: 551 Rhodium Wrist-Piston

  • Item 4 | Rare | Tech | Weapon
  • Price: 2,100 credits
  • Usage: held in 1 hand (integrated); Bulk: 1
  • Base Weapon: 2d8 B; Range: 60 ft.; Capacity: 5
  • Game Mechanics:
    • Impactful Trajectory: On a critical hit, the target is knocked Prone and pushed 5 feet away from the shooter.
    • Integrated Magazine: This weapon has the Auto-Reload trait, allowing the user to reload as a single action without needing a free hand, provided they have a spare magazine on their person.
    • Seismic Burst [Two Actions]: The user slams the piston into a floor or bulkhead. This functions as a 10-foot burst. All creatures in the area must succeed at a Reflex save against the user’s Class DC or be knocked Prone.
  • Syntax: “A concussive crack echoes through the station as a heavy rhodium slug exits the gauntlet amidst a hiss of superheated steam.”

Traveller (Mongoose 2nd Edition)

Item Name: TL12 Heavy Kinetic Vambrace

  • Tech Level: 12
  • Weight: 2 kg
  • Cost: Cr 3,500 (Ammo Cr 100 per magazine)
  • Game Mechanics:
    • Damage: 3d6+3
    • Armor Piercing: The dense rhodium bolt has AP 5.
    • Recoil: 3 (The user must have a STR of 9+ to fire one-handed without a -2 DM to the attack).
    • Stability: While wearing the 551, the user gains a +1 DM to resist being knocked back or moved against their will.
  • Syntax: “The wrist-mounted cylinder cycles with a heavy mechanical clack, launching a high-density projectile that ignores standard ballistic plating.”

Warhammer (Age of Sigmar: Soulbound)

Item Name: 551 Steam-Piston Gauntlet

  • Rarity: Rare
  • Damage: 2 + S (Crushing)
  • Range: Medium
  • Game Mechanics:
    • Kinetic Force: If you score an Outstanding Success on an attack, the target is knocked Prone and moved to an adjacent Zone of your choice.
    • Fixed Mount: This weapon occupies the Arm slot and cannot be dropped. You gain a +1d6 bonus to Might tests to resist being pushed.
    • Redline [Free Action]: Once per encounter, you may increase the Damage of your next attack with this weapon by +2. However, the weapon becomes Inoperable until you spend an Action to vent the excess steam.
  • Syntax: “A thunderous hiss and a jolt of amber light signal the release of the rhodium bolt, turning the enemy’s momentum against them with a violent, bone-shattering strike.”