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Equation 702 Steam Rupture Lance

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by

Dale
in

From: Item 512 of the Arcane Engram Codex

Description: A Tier 1 evocation spell engineered for combat in cramped factory settings. It draws ambient moisture from the air (or steam vents) and compresses it with arcane energy into a superheated, high-velocity projectile. It is designed to punch through heavy armor or thick monster hides rather than create a wide explosion, minimizing collateral damage to nearby machinery.

Roleplay: Utilizing the codex’s “Targeting Algorithm,” the avatar holds the book steady, allowing the holographic reticles to align on the target’s weak point. The chant sounds less like traditional magic and more like a pressure valve slowly giving way. Upon release, the avatar thrusts two fingers forward through the hologram. A blindingly fast needle of violet energy and superheated water fires with a loud, deafening crack, leaving a lingering trail of localized fog and the scent of boiled copper.

Lore of Equation 702

In the industrial sprawl of Saṃsāra, the greatest threat to a mage is often their own environment. Early Tyrian combat-casters found that traditional fireballs or lightning bolts were a death sentence in the “Pipe-Jungles” of the lower wards; a stray spark could ignite leaked gas, or an explosive blast could rupture a high-pressure steam main, killing the caster along with the target.

Equation 702 was developed by the “Valve-Watchers,” a guild of mages tasked with clearing vermin from critical infrastructure. They realized that the air itself, saturated with humidity and leaking steam, was a weapon. By applying the mathematical principles of hydraulic pressure to arcane manifestation, they created a spell that doesn’t explode—it pierces. The “Lance” is not a physical object but a hyper-compressed stream of water molecules encased in a violet kinetic sheath. It mimics the industrial “water-jet cutters” used to slice through thick steel, scaled up for the battlefield.

The Use of the Steam-Rupture Lance

Equation 702 is the definitive “Boss-Killer” for a Tier 1 avatar. While other spells deal with crowds, the Lance is designed to eliminate a single, high-priority target wearing heavy plate armor or possessing thick, natural chitin.

Its use is surgical. Because it draws from ambient moisture, the spell is significantly more potent in humid environments—such as sewers, rainforests, or steam-filled factories. The projectile moves with such velocity that it creates a localized vacuum in its wake, often pulling a thin trail of mist behind it. It is the perfect tool for a caster who needs to end a fight with one precise, devastating shot while standing in a room full of volatile chemicals.

Assigned Values and Mechanics

Category Specific Assignment
Spell Name Equation 702: Steam-Rupture Lance
Tier Limit Tier 1
Frequency Once per day (The internal quartz indexing requires a full thermal reset)
Mana Cost 15 Mana Points (or 1 Tier 1 Spell Slot)
Requirements Held Arcane Engram-Codex (Item 512), Somatic (Two-finger thrust), Verbal (Pressure-vent hiss)
Range 60 Feet (Line)
Damage High Piercing / Thermal Damage (Ignores 3 points of Armor/Hardness)
Environmental Bonus +2 Damage if cast in a “Humid” or “Steam-Filled” environment.
Skills Used Spell Attack (Intellect-based), Perception (for targeting weak points)

 

Tags

Tier-1, Evocation, Single-Target, Armor-Piercing, Thermal, High-Velocity, Hydraulic, Steam-Tech, Line-Of-Sight, Precision-Strike, Surgical-Strike, Hydraulic-Pressure, Cauterizing-Heat, Armor-Bypass, Low-Collateral, Water-Based, High-Pressure

Roleplay and Tactics

Tactical Applications

  • Armor Nullification: This spell is your answer to the “Tank.” If an enemy is hiding behind a heavy shield or thick scales, Equation 702 ignores a portion of that protection. Always aim for the heaviest target on the field.
  • Collateral Safety: Unlike an Aura or Blast spell, Equation 702 travels in a straight, narrow line. You can safely fire this past an ally’s shoulder or through a gap in expensive machinery without fear of collateral damage.
  • Environmental Synergy: If you are fighting in a dry desert, consider splashing water from a canteen on the ground or into the air before casting. The spell requires moisture; providing it yourself ensures the spell functions at peak efficiency.

Immersive Roleplay

  • The “Hissing” Chant: Instead of ancient Latin-esque words, the roleplayer should describe a sound like a kettle reaching a boil. Start with a low ssssss that rises in pitch and intensity as the violet light builds in the Codex’s hologram.
  • The Kinetic Recoil: Even though it is a spell, the “Hydraulic” nature of the Lance creates a physical kickback. The avatar’s arm should jerk backward upon release, and the air in front of them should ripple with a visible shockwave.
  • The Aftermath: Describe the scent of “boiled copper”—the smell of metal heated by extreme friction. The target shouldn’t just be “hurt”; they should have a glowing, cauterized hole through their armor, with steam still whistling out of the wound.
  • The Targeting Interface: Roleplay the “Targeting Algorithm” of the Codex. Mention the violet holographic crosshairs sweeping across the enemy’s chest, flickering from “Searching…” to “LOCKED” as the avatar finds the seam in the armor.

Activation Perception of Equation 702: Steam-Rupture Lance

User’s Perspective: Physical Senses

Visual Perception

  • What is Perceived: A locking geometric reticle and a blinding linear flash.
  • Description: As the spell is prepped, a violet holographic crosshair projects from the codex, sweeping until it visually “snaps” onto the target. Upon thrusting the fingers forward, a needle-thin, blindingly bright violet beam instantly connects the caster to the target, leaving a lingering, fading streak of ionized air and mist.
  • Positives: Provides absolute, pinpoint visual confirmation of the spell’s trajectory. The lingering mist-streak can briefly point to the exact location of a target, even if they fall behind cover.
  • Negatives: The sheer brightness of the compressed beam creates a temporary afterimage in the caster’s eyes, causing a moment of visual tunneling right down the line of fire.

Auditory Perception

  • What is Perceived: A rising pressure-valve hiss followed by a deafening sonic crack.
  • Description: The casting chant physically alters the air, creating a high-pitched squeal of straining metal and boiling water. When the spell is released, it breaks the sound barrier instantly, resulting in a concussive, whip-like CRACK that echoes violently off nearby surfaces.
  • Positives: The terrifying build-up and resulting boom serve as immense psychological warfare, frequently causing nearby enemies to flinch or drop their guard.
  • Negatives: The extreme decibel level of the sonic boom will cause temporary ringing (tinnitus) in the caster’s ears and instantly alert every creature within the industrial sector to their exact location.

Tactile & Olfactory Perception

  • What is Perceived: Violent recoil, extreme desiccation, and the stench of boiled copper.
  • Description: The moment the spell fires, the caster’s thrusting hand is hit with massive hydraulic kickback, jerking the arm backward. Simultaneously, the air immediately surrounding the caster feels instantly, painfully dry as all ambient moisture is sucked into the spell matrix. A wave of radiant heat washes over the face, accompanied by the sharp, metallic tang of superheated machinery and vaporized blood.
  • Positives: The sudden vacuum of moisture can instantly clear localized fog, smoke, or toxic gases directly around the caster for a brief moment.
  • Negatives: If the caster does not properly brace their shoulder and wrist, the recoil can cause severe sprains. Careless casters often suffer minor thermal burns on the tips of their casting fingers.

User’s Perspective: Extra-Sensory Perceptions (ESPs)

Hydraulic-Tension Sense

  • What is Perceived: A localized compression of spatial reality.
  • Description: Through the Mind’s Eye, the caster feels the surrounding ambient water molecules not as wetness, but as a vast, invisible web. During the chant, this web is violently yanked toward their fingertips, compressing into an impossibly dense singularity of kinetic potential that feels like holding a miniature collapsing star.
  • Positives: This sense grants the caster a momentary, subconscious awareness of all moisture in a 30-foot radius, allowing them to blindly sense the presence of hidden biological creatures (which are mostly water) or concealed steam pipes.
  • Negatives: The sheer density of the gathered mana feels like a heavy, crushing physical weight on the caster’s consciousness. Holding the spell for more than a few seconds before firing induces severe magical migraines.

Target Vulnerability Resonance (The “Lock-On”)

  • What is Perceived: A geometric highlighting of structural weakness.
  • Description: As the codex’s targeting algorithm syncs with the caster’s mind, the target ceases to look like a living creature or a machine. Instead, the caster’s brain perceives them as a complex mathematical wireframe. A specific point—a rusted joint, a thin scale, a scarred breastplate—pulses with a glaring, crimson warning light in their mind’s eye.
  • Positives: Allows for flawless surgical precision, guaranteeing the spell strikes the most devastating structural weak point without requiring traditional marksmanship skills.
  • Negatives: This forces the caster into a cold, hyper-logical state of mind. Viewing living, breathing enemies purely as “structural equations to be solved” can be deeply alienating and emotionally numbing over time.

702 Needles of Wet Squeeze

It is written on the rusted skins of the metal trees where the sun never looks. This is the word-memory from the Time of the Too Much Boiling. In the deep places of the world, the walkers of the loud tunnels lived in the Forest of Hollow Iron. The hollow iron carried the ghost-water [steam] that makes the wheels turn.

In the old days, the speakers of the math-magic were very foolish in the head. When the danger-beasts came into the iron forest to eat the walkers, the speakers would throw the fat fire [fireballs] and the wide lightning. This was a bad choosing. The fat fire hit the danger-beasts, but the fat fire also hit the hollow iron trees. The trees would burst open with a great shouting, and the boiling ghost-water would cook the walkers like the river-crabs. To use the big magic in the iron forest was to invite the death for everybody in the room.

There was a walker named Eye-Of-The-Valve. He was a speaker of the counting-shapes. One dark cycle, the Great Crawling Iron-Skin came into his tunnel. The beast had a back made of the hard mountain shell [thick armor plate]. The spears of the guards only tickled it. The fat fire of the old magic would break the pipes and cook the guards.

Eye-Of-The-Valve was watching a very small break in a pipe. The pipe was hissing with the angry ghost-water. The hole was very small, like the eye of a needle. But the ghost-water came out so fast that it cut a solid rock into two pieces.

Eye-Of-The-Valve said to his think-box, “Ah! The fat fire is wide and stupid. But the ghost-water, when it is squeezed very tight, is a sharp knife that does not make a fat explosion.”

He went to his hot-room. He took his heavy book of the yellow metal [Codex]. He tried to make the counting-shapes [math] to squeeze the ghost-water. He tried the counting of one. The water just made his hand wet. He tried the counting of four-hundred. The water became hot but did not go fast. He tried the counting of seven-hundred-one. The water went fast but exploded, burning his eyebrows into the nothing.

Then, he did the counting of seven-hundred-two. He told the math to take the sweat of the air [humidity] and push it together with the purple light of the kinetic holding.

The Great Crawling Iron-Skin came to eat Eye-Of-The-Valve. Eye-Of-The-Valve did not run. He held the heavy yellow book. He found the counting of seven-hundred-two. He pushed the wheels. The purple light jumped up. Eye-Of-The-Valve looked through the purple light at the beast. The light made a cross in the air. The cross moved until it found the place where the beast’s hard mountain shell had a weak hinge. The purple cross blinked the warning of the target.

Eye-Of-The-Valve began the speaking words. It did not sound like the singing magic. It sounded like the iron pot screaming because the water is too hot. Sssssss-shhhh-SSSSS! The air around him suddenly became very thirsty. All the wetness in the tunnel was sucked into his hand.

He pushed his two pointing-fingers through the purple ghost-picture. He let the counting-shape go.

CRACK!

The sound was louder than the falling sky. Eye-Of-The-Valve’s arm was kicked backward by an invisible horse. Out from his fingers flew a needle of purple light. It was not fire. It was water squeezed so tight it was harder than the diamond.

The purple needle flew. It did not touch the iron trees. It did not make a fat explosion. It hit the Great Crawling Iron-Skin exactly on the weak hinge. The needle punched through the thick shell, went through the meat of the beast, and buried itself deep into the stone floor.

The tunnel was quiet. There was a long line of white cloud hanging in the air where the purple needle had traveled. The smell was very strange. It smelled like the brown metal [copper] when it is left in the fire for too many turnings of the moon.

The Great Crawling Iron-Skin stood still. Steam whistled out of a perfect, tiny round hole in its back. Then, the beast fell over, completely dead of the inside-cooking. The iron trees of the tunnel were perfectly safe.

All the speakers of the math-magic threw away the fat fire. They learned the counting of seven-hundred-two. They walked the tunnels, drinking the sweat of the air to make the purple needles, and the iron pipes never burped the boiling death upon them again.

Moral of the Story: Do not use the fat fire to kill a bug on a glass window; instead, squeeze the water until it is a fast needle, and the window will not break.

Suggested conversions to other systems:

Call of Cthulhu (7th Edition)

Equation 702: The Needle of Pressurized Vapor

In the world of Cthulhu, this is a dangerous piece of hyper-geometry or “Weird Science” that manipulates fluid dynamics beyond human understanding. It is treated as a combat spell that carries a heavy physical toll.

  • Cost: 10 Magic Points; 1D6 Sanity
  • Casting Time: 2 Rounds (1 to calculate/aim, 1 to release)
  • Damage: 2D10+4 (Ignores up to 8 points of mundane Armor)
  • Game Mechanics: The caster must succeed in a Science (Mathematics) or Hard Occult roll to lock the targeting reticle. On a success, a line of superheated vapor pierces the target. On a fumble, the “pressure valve” fails, dealing 1D6 damage to the caster and permanently jamming the device until a successful Mechanical Repair roll is made.
  • Syntax Note: The deafening crack requires all nearby individuals to make a CON roll or be stunned for 1 round.

Blades in the Dark

Equation 702: The Steam-Rupture Lance

A high-tech Spark-craft ritual favored by those who hunt the hull-clad Horrors of the Deathlands or heavily armored Bluecoats in narrow alleyways.

  • Type: Arcane Tool / Ritual
  • Stress Cost: 3 Stress
  • Game Mechanics: When you use the Lance to strike a target, it is always considered a Great Effect against armor or physical barriers. The attack is a “Precision” move; you do not cause collateral damage to the environment, allowing you to fire safely in a workshop or vault.
  • Specific Rule: This counts as a Fine weapon for the purposes of quality. On a “Critical” success, the lance pierces through the first target and strikes a second target immediately behind it.
  • Complication: The “Boiled Copper” scent is a tell-tale sign of Spark-craft; anyone tracking the user via Survey or Hunt gains +1d to find them within the next hour.

Dungeons & Dragons (2024 Edition)

Equation 702: Steam-Rupture Lance

1st-Level Evocation (Wizard)

  • Casting Time: 1 Action
  • Range: 60 feet (Line)
  • Components: V, S, M (The Arcane Engram-Codex)
  • Duration: Instantaneous
  • Frequency: Once per Day

A 60-foot long, 1-foot wide line of superheated, pressurized water streaks from your fingers. Each creature in the line must make a Dexterity saving throw. On a failed save, a creature takes 3D8 piercing damage. On a successful save, a creature takes half as much damage.

Armor Piercing: This spell ignores any AC bonus provided by non-magical shields. If the target is wearing heavy armor or has Natural Armor, they take an additional 1D8 fire damage as the steam cauterizes the wound. This spell deals double damage to objects made of wood, stone, or thin metal, but does not cause explosions.

Knave (2nd Edition)

Equation 702: The Vapor Needle

A high-pressure spell found on rare quartz slides. It is the ultimate “point-and-kill” tool for subterranean dungeon crawlers.

  • Casting: Intelligence check (to align the reticle).
  • Damage: 1D10 + Intelligence Bonus.
  • Range: 60ft Line.
  • Game Mechanics: The spell ignores any armor worn by the target (the target’s Defense is treated as 10). If the environment is damp or misty, add +2 to the damage roll.
  • Restriction: You can only cast this once per day. If you roll a 1 on your casting check, the high-pressure feedback deals 1D4 damage to your casting arm and the spell fails.
  • Visual: A trail of fog remains in the air for 1D6 rounds after casting, providing “Partial Cover” for anyone standing directly in the line.

Fate

Equation 702: Steam-Rupture Lance

  • Type: Magical Stunt
  • Cost: Once per day.
  • Description: The avatar locks onto a target’s structural flaw via a holographic reticle and fires a hyper-compressed needle of superheated vapor.
  • Game Mechanics: When you use Equation 702 to make an Attack using Lore or Shoot, you ignore any physical Armor benefits the target possesses (such as the Heavy Armor Stunt or similar Aspects).
  • Specific Rule: If the target has an Aspect related to being “Large,” “Constructed,” or “Armored,” you gain a +2 bonus to the attack roll as the spell seeks out their specific structural weak points.
  • Complication: Because of the hydraulic recoil and the “Surgical” focus required, you are Restricted from moving or taking a supplemental action on the same turn you cast this spell.

Numenera & Cypher System

Equation 702: Steam-Rupture Lance

  • Level: 4 (Evocation)
  • Kind: Esotery (Enlisted via Item 512)
  • Cost: 4 Intellect (and Once per Day restriction)
  • Range: Long (100 feet)
  • Game Mechanics: You fire a beam of hyper-pressurized water and arcane energy in a straight line.
  • Specific Rule: This attack deals 6 points of damage. It ignores up to 3 points of Armor. If the target is a machine or a creature with a hard outer shell (chitin, stone, metal), it deals an additional 2 points of damage (8 total).
  • Complication: The “Deafening Crack” of the sonic boom makes the caster “Deafened” for one round and alerts all creatures within a mile of the caster’s location.

Pathfinder (2nd Edition)

Equation 702: Steam-Rupture Lance (Spell 2)

  • Traits: Uncommon, Attack, Evocation, Fire, Water
  • Cast: [two-actions] (Valve-Hiss Chant, Two-Finger Thrust)
  • Range: 60 feet; Target: 1 creature
  • Frequency: Once per day.
  • Game Mechanics: Make a ranged spell attack roll against the target’s AC. On a hit, the target takes 4d6 piercing damage and 1d6 persistent fire damage from the superheated steam.
  • Specific Rule: This spell ignores the first 5 points of any Physical Resistance the target has. If the attack is a critical success, the target is also Stunned 1 from the concussive force of the hydraulic impact.
  • Roleplay Constraint: You must have a hand free to perform the two-finger thrust through the Codex’s hologram.

Savage Worlds (Adventure Edition)

Equation 702: Steam-Rupture Lance

  • Power: Bolt (Modified)
  • Rank: Novice
  • Power Points: Special (Once per Day)
  • Range: 12/24/48; Damage: 3d6
  • Game Mechanics: Success on a Spellcasting roll fires a needle of superheated water.
  • Specific Rule: The Lance has AP 4 (ignores 4 points of Armor). It is a “Straight Line” attack; if it kills the target, the GM may allow the Bolt to continue through to hit a second target directly behind the first (subtracting 4 from the damage roll for the second target).
  • Environmental Synergy: If the setting is currently “Rainy,” “Foggy,” or inside a “Steam Works,” the damage increases to 3d6+2.
  • Complication: The recoil is significant. After firing, the caster is Distracted until the end of their next turn.

Shadowrun (6th World Edition)

Equation 702: MCT “Steam-Jet” Strike

This spell is classified as a “Limited Combat Spell.” It is heavily favored by corporate mages working in the tight, industrial corridors of “Renraku Arcology” or “MCT Zero-Zones” because its lack of splash damage prevents expensive hardware from being bricked.

  • Type: Physical, Direct Combat
  • Range: Line of Sight (Line)
  • Duration: Instantaneous
  • Drain Value: 5
  • Frequency: Once per Day
  • Game Mechanics: The caster makes a Spellcasting + Magic vs. Intuition + Reaction test. If successful, the spell manifests as a hyper-pressurized needle of water.
  • Specific Rule: The spell grants a +2 bonus to Armor Penetration (AP). Additionally, because it is a precision strike, it ignores the target’s “Cover” defensive bonuses unless the cover is total (behind a reinforced wall).
  • Syntax Note: The “Sonic Crack” of the spell creates a noise signature equivalent to a heavy rifle shot. The “Boiled Copper” scent remains in the area for 10 minutes, allowing trackers using scent-based sensors to gain a +1 Tactical Advantage.

Starfinder (2nd Edition Playtest)

Equation 702: Steam-Rupture Lance

  • [Area] 60-ft. line; [Target] 1 creature in the line
  • Defense AC; Duration Instantaneous
  • Frequency Once per Day
  • Game Mechanics: You utilize your matrix-codex to calculate a structural weakness. Make a ranged spell attack roll against the target’s AC. On a hit, the target takes 4d8 piercing damage.
  • Specific Rule (Precision Breach): This attack ignores “Hardness” and non-magical Physical Resistance (PR) up to 5. If the target is a Construct or an armored vehicle, the damage increases by an additional 1d8.
  • Syntax Note: Upon firing, the caster must succeed at a DC 15 Athletics check or be knocked Prone by the hydraulic recoil. The 60-foot line is filled with a “Mist Cloud” that provides Concealment for 1 round.

Traveller (Mongoose 2nd Edition)

Equation 702: TL 13 Hydraulic Penetrator Software

In the Far Future, this is a “One-Shot” high-pressure burst routine stored on an indestructible quartz drive, capable of punching through boarding-party vacc suits or armored bulkheads.

  • Tech Level: 13
  • Skill Requirement: Electronics (Computers) or Gunner (Turret)
  • Range: 50 Meters
  • Game Mechanics: Activating the program requires a Difficult (10+) Electronics check. On a success, the drive fires a needle-thin jet of water and kinetic energy.
  • Specific Rule: The Lance deals 4D6 damage. It possesses the AP 10 trait (ignoring 10 points of Armor). Because it is a surgical strike, it does not possess the “Blast” or “Burst” traits and cannot damage the ship’s internal systems beyond the immediate target.
  • Syntax Note: The recoil is equivalent to a high-powered slugthrower. If the user does not have a Strength of 8+, they take a -2 DM to their next action due to physical jar.

Warhammer (Age of Sigmar: Soulbound)

Equation 702: The Sky-Dwarf’s Pressure-Lance

A “Chamon-touched” spell found within Ironweld Engram-Codices, blending the engineering of the Kharadron Overlords with the offensive traditions of the Collegiate Arcane.

  • Complexity: 14
  • Duration: Instantaneous
  • Frequency: Once per Day
  • Game Mechanics: You channel the moisture of the Realm into a concentrated point. Make a Mind (Channeling) Test. If successful, you deal 5 + (additional successes) Damage to a single target within Long Range.
  • Specific Rule: This attack is “Piercing.” It ignores any Armor the target has, representing the steam jet finding the exact gaps in Chaos-forged plate or monster hide.
  • Syntax Note: The loud crack of the spell release causes all creatures in the same Zone to become “Deafened” until the end of their next turn. A thick “Steam Fog” settles in the Zone, making all tasks involving Sight one step more difficult for 1 round.