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Electrokinetic Pulse Drone EPD-3 'Thunderhead'

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Electrolytic Bone Density Projector EBDP-4 'Chalk'

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Galvanic Myofibril Lash

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Galvanic Vapor Diffusion Pistol GVDP-1 'Saltlick'

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Gauss Flechette Repeater GFR-3 'Needlerain'

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Gravimetric Induction Pistol GIP-4 'Undertow'

energy

Electrolytic Bone Density Projector EBDP-4 'Chalk'

The EBDP-4 delivers a pulsed electrolytic field tuned to disrupt the calcium hydroxyapatite mineral matrix of cortical bone. Rather than fracturing bone mechanically, the weapon induces rapid electrolytic demineralization — stripping calcium ions from the bone lattice through a process similar to accelerated osteoclast activity compressed into milliseconds. The result is a localized region of catastrophically weakened bone that fails under normal mechanical load, causing compound fractures from the target's own movement or the force of incidental contact.

name

Electrolytic Bone Density Projector EBDP-4 'Chalk'

aliases

Chalk
The Whitener
Bone Dry
Dissolve

category

energy

manufacturer

HELIX BIOSYSTEMS

tier availability

Black market

legality

Prohibited

base technologies

Electrolytic demineralization projection
Calcium ion displacement field
Cortical bone lattice resonance targeting

specifications

length: 55 cm
weight: 2.8 kg
power source: Helix BioElec HBE-7 dual-cell
effective range: 6–70 m
pulse frequency: 3.4 MHz electrolytic field
demineralization onset: Immediate on sustained hit (0.3 second minimum)
target bone density reduction: 60–80% in affected region per full pulse
shots per cell: 18 full pulses
chassis: Medical-grade polymer housing (repurposed surgical device chassis)

tactical use

The EBDP-4 is used almost exclusively in ambush and assassination contexts. Operators typically deliver a pulse to a load-bearing structure — femur, tibia, or lumbar vertebrae — and then allow the target to continue moving until natural biomechanical stress causes the weakened bone to fail. The delayed collapse window (2–15 seconds of continued movement) allows an operator to disengage before the target falls, making attribution difficult. Some operators use it to pre-weaken a target before a physical confrontation, ensuring that even minor strikes will cause catastrophic structural failure.

cultural context

The EBDP-4 originated as a Helix Biosystems prototype for non-invasive bone density correction in degenerative disease patients — the demineralization function was intended to prepare bone tissue for remineralization therapy. The weaponized version surfaced on the black market roughly eighteen months after the prototype was shelved, suggesting an inside leak. In GLMZ's underworld, being hit by Chalk is considered one of the most humiliating ways to be taken down — experienced criminals read the injury pattern and know the target was marked in advance, implying either betrayal or surveillance. Helix Biosystems publicly denies any connection to the weapon.

known users

High-end assassination contractors
Corporate intelligence wetwork operatives
Black-market surgeon 'Dr. Fallow' (known reseller)
Organized crime enforcer 'Ivory' (signature weapon)
Helix Biosystems internal security (rumored, denied)

story hooks

A series of seemingly accidental falls and sports injuries among mid-level corporate managers are revealed to be EBDP-4 attacks — someone is running a long-term removal campaign designed to look like a bad luck streak.
A black-market dealer offers the party a EBDP-4 unit, but the weapon's internal logs contain targeting data for dozens of past operations — a treasure trove of evidence and a death sentence if the wrong people find out they have it.
Helix Biosystems hires the party to locate and destroy all existing EBDP-4 units before a regulatory investigation connects the weapon's design to their shelved medical prototype — but the party discovers the weapons were deliberately leaked by a Helix executive.
A player character begins experiencing unexplained bone fractures from minor impacts — a delayed-onset EBDP-4 pulse delivered days earlier is slowly destroying their skeletal structure, and they need the specific Helix antidote protocol before it reaches the spine.

ammunition type

Helix Biosystems Compact Power Cell HB-3

related entities

University Spine
Brewer's Spine
Djeneba Park-Traore
Ferrogate Enforcer Cruiser
GLMZ
Helix Biosystems
Iron Meridian Cooperative Backbone IMC-3 'Spine'
Ironclad Agrisystems Deadfield Jammer — 'The Fallow'
TESSERA PG-2 'Signature'
The Resonance Communion
Vantablack-CNX

physical description

visual profile	A sleek, medical-instrument-turned-weapon with an ergonomic surgical aesthetic. Resembles a high-end diagnostic probe or therapeutic device rather than conventional gunware—deliberately deceptive. Tapered, almost organic curves suggest biotech origin. The barrel is narrow and recessed, with a faint ionization glow visible in dim light.
dimensions	55 cm length overall; barrel depth 8 cm; grip width 4.2 cm; profile roughly 12 cm at widest (rear capacitor housing)
weight description	Surprisingly light and balanced despite internal power cells—2.8 kg distributes toward the rear, making it point-light and controllable in one hand. Feels like holding a high-end medical scanner rather than lethal hardware.
primary material	Medical-grade polymer housing (white/translucent composite) over carbon-fiber reinforced skeleton. Internal architecture visible through frosted polymer panels on the rear capacitor assembly.
finish	Matte translucent white polymer with brushed stainless steel accents. Internal circuitry and dual-cell power core slightly visible through panel seams—a design choice that reads as professional rather than militaristic. Minimal paint; most surfaces are bare composite.
color scheme	Clinical white and ice-blue primary; stainless steel secondary accents. Faint cyan glow from active capacitor cells visible through rear housing panels. No tactical black or drab finishes—the weapon deliberately mimics medical equipment.
grip texture	Textured medical-grade silicone wrapped around the rear grip section. Slightly tacky, designed for precision control during extended use. Finger grooves are subtle and anatomically refined.
distinctive features	Recessed ionization barrel with faint blue corona discharge visible when armed Dual-cell HBE-7 power core visible through translucent rear panel with blue electrolyte glow Frequency calibration dial (3.4 MHz marking) on the left side grip Minimal sighting system—optical targeting reticle on top rail, sleek and low-profile Heat-dissipation vents along the barrel shroud (surgical cooling design, not tactical) Pulse-feedback indicator lights (cyan LED) on the capacitor housing, stepping up in intensity during charge cycle No visible safety selector—safety is likely biometric or firmware-locked Wear-resistant nano-coating on barrel tip—almost invisible, but catches light with an oil-slick iridescence
manufacturer markings	HELIX BIOSYSTEMS logo (double helix in chrome) stamped on the left side of the capacitor housing. Serial number engraved on a small stainless steel plate recessed into the grip. Regulatory/hazard markings in small text on the barrel shroud (barely visible, clinical rather than tactical).
condition typical	Field units range from pristine to lightly worn. Some show discoloration around the barrel tip from electrolytic discharge residue (faint mineral staining). Grip silicone may show minor scuffs. Operators maintain these meticulously—they're surgical instruments first, weapons second. Black-market units sometimes show jury-rigged modifications to the targeting system or power cell housing.

image prompt

Clinical product photography of an Electrolytic Bone Density Projector EBDP-4 'Chalk' on matte dark surface. Medical-grade white translucent polymer housing with brushed steel accents and visible cyan-glowing capacitor cells in rear panel. Narrow recessed barrel with faint ionization aura. Gripped by a gloved hand (black tactical glove with silver palm plating). Dramatic side-lighting from cool blue LED source, creating sharp shadows and highlighting the translucent polymer panels and internal circuitry. Neo-noir biotech aesthetic—surgical precision meets lethal purpose. Dark blurred background suggesting GLMZ corporate lab environment. Sharp focus on barrel and targeting optics. Professional medical-instrument composition. --ar 3:2 --v 6

visual prompt