Hearthstone WM-5 'Porter'

Domestic

Arcturus KS-4 'Knitter'

Spider Platform — Antipersonnel

TESSERA TN-1 'Cradle'

Containment — Autonomous Prisoner Transport

Crucible ER-5 'First Response'

Medical

Ouroboros AQ-3 'Undertow'

Aquatic Platform — Harbor Patrol/Denial

Iowan Behemoth — 'Meridian 88'

Iowan Behemoth

Ringo WP-6 'Nightwatch'

Security

Sterling-Nakamura SX-0 'Revenant'

Infiltration Platform — Identity Replication

TESSERA ES-4 'Perimeter'

Security

Arcturus MX-1 'Cerberus'

Multi-Platform — Three-Headed Sentry

Tessera TP-0 'Shepherd's Crook'

Population Control Platform — Behavioral Herding

Arcturus KS-11 'Coffin Nail'

Spider Platform — Precision Kill

Ringo SC-3 'Seneschal'

Domestic

Lazarus MX-7 'Sawbones'

Medical Platform — Involuntary Augmentation

Vantablack VD-2 'Paparazzi'

Pursuit Drone — Harassment/Documentation

Lazarus APC-2 'Locust'

Agricultural — Pest Interdiction Swarm

Crucible Industries CR-9 'Foundry'

Self-Replicating Platform — Manufacturing

TESSERA TX-12 'Chorus'

Swarm — Acoustic Weapon Platform

Arcturus PX-1 'Phantom'

Experimental — Active Camouflage Platform

Ouroboros UT-1 'Worm'

Tunnel Platform — Boring/Assault

Arcturus PG-3 'Aegis'

Security

Red Circuit RC-Pit 'Dogfighter'

Training

Arcturus UP-2 'Sandhog'

Industrial

Arcturus CK-1 'Fetch'

Canine Platform — Explosive Delivery

Lazarus MN-1 'Angler'

Capture Platform — Chemical Lure and Restraint

Arcturus GW-1 'Gargoyle'

Static Sentry — Architectural Integration

Lazarus MB-3 'Mosquito'

Micro Aerial — Pharmaceutical Injection

Dynamo Fitness DF-Coach 'Ironside'

Training

Crucible CN-1 'Cradle'

Domestic

Arcturus FF-9 'Salamander'

Medical

Arcturus EW-3 'Migraine'

Electronic Warfare — BCI Disruption Platform

Lazarus EC-4 'Companion'

Domestic

Iowan Behemoth — 'The Foundry'

Iowan Behemoth

Iowan Behemoth — 'Revenant'

Iowan Behemoth

Crucible HS-2 'Hearth'

Domestic

TESSERA TC-3 'Crucible'

Heavy Platform — Mobile Incinerator

Meridian Domestic MV-9 'Jarvis'

Domestic

Crucible SAR-6 'Saint Bernard'

Search and Rescue — Heavy Platform

Arcturus BW-1 'Widow's Walk'

Pursuit Platform — Relentless Tracking

Kang Athletics KA-500 'Sparmate'

Training

Crucible VG-7 'Bastion'

Security

Ringo RT-4 'Oxcart'

Walking Tank — Logistics and Suppression

Ringo EV-3 'Watcher'

Security

Vantablack VS-3 'Skin Job'

Infiltration Platform — Wearable Exoskeleton

Ouroboros PN-2 'Flicker'

Sabotage Platform — Infrastructure Corruption

Iowan Behemoth — 'Palisade'

Iowan Behemoth

Tessera TX-15 'Cradle Song'

Neural Warfare Platform — Memory Manipulation

TESSERA TX-0 'Mimic'

Experimental — Shape-Memory Chassis

Vantablack VO-1 'Looking Glass'

Optical Warfare Platform — Reflection Manipulation

Vantablack FH-20 'Convoy'

Autonomous Vehicle — Heavy Freight

Arcturus BH-2 'Marrow'

Resource Extraction Platform — Biological Material Harvesting

TESSERA GK-8 'Doorman'

Security

Crucible Industries CX-1 'Golem'

Heavy Platform — Construction/Demolition Combat

TESSERA Widow Mk. III

Spider Platform — Area Denial

Arcturus HD-1 'Homestead'

Domestic

Lazarus LX-5 'Siphon'

Medical Warfare Platform — Biological Data Extraction

TESSERA CR-12 'Whisper'

Communications — Tactical Relay Platform

Iowan Behemoth — 'Thunderhead'

Iowan Behemoth

Ringo RR-1 'Rattlesnake'

Serpentine — Area Denial

Lazarus BX-0 'Test Subject'

Experimental — Biomechanical Hybrid

Crucible Industries CK-3 'Junkyard'

Canine Platform — Scrap Recovery/Combat

TESSERA TX-8 'Scarecrow'

Psychological Operations — Terror Platform

Ouroboros PG-2 'Blackout'

Infrastructure Weapon — Power Grid Attack

TESSERA TK-4 'Hellhound'

Canine Platform — Incendiary

Arcturus DX-4 'Taxidermist'

Deception Platform — Corpse Manipulation

Ringo RM-4 'Thresher'

Agricultural/Combat — Autonomous Clearing Platform

TESSERA TH-2 'Warden'

Walking Tank — Urban Pacification

Iowan Behemoth — 'Cathedral'

Iowan Behemoth

Vantablack VS-1 'Cameraman'

Spider Platform — Surveillance

Kang Athletics KA-900 'Sensei'

Training

Hearthstone CK-3 'Stockpot'

Domestic

Plot 17

Agricultural (Modified)

Arcturus HX-1 'Headsman'

Execution Platform — Autonomous Lethal Enforcement

Iowan Behemoth — 'The Granary'

Iowan Behemoth

Hearthstone GN-6 'Greenthumb'

Domestic

Arcturus CK-5 'Bloodhound'

Canine Platform — Pursuit and Tracking

Lazarus NB-1 'Cradle Robber'

Medical Platform — Neonatal Extraction

Kang Athletics KA-200 'Padwork'

Training

Tessera TS-9 'Locust Cloud'

Swarm Platform — Biological Material Consumption

Arcturus KS-7 'Nursery'

Spider Platform — Swarm Carrier

Crucible RW-3 'Paver'

Industrial

Ringo RB-1 'Judas Goat'

Deception Platform — Synthetic Human Mimicry

Ringo EV-5 'Showstopper'

Entertainment — Performance Platform

Lazarus NI-1 'Earwig'

Infiltration Platform — Neural Intrusion

Ouroboros PD-1 'Leech'

Parasitic Platform — Energy Theft

Meridian Domestic PB-4 'Nana'

Domestic

Hearthstone HC-2 'Dustbin'

Domestic

Lazarus SA-6 'Steadyhand'

Medical

Arcturus UT-5 'Lamprey'

Tunnel Platform — Pursuit

Ringo AG-7 'Fieldhand'

Industrial

Plot 17

Agricultural (Modified)

TESSERA WL-6 'Stacker'

Industrial

Crucible CW-8 'Ironworker'

Industrial

Ringo PT-8 'Truckline'

Industrial

Ringo AB-3 'Barker'

Commercial — Advertising Display Drone

Arcturus MN-3 'Digger'

Industrial

Ouroboros EW-7 'Requiem'

Area Denial Platform — Acoustic Weapon

Lazarus LX-2 'Lab Rat'

Experimental — Autonomous Test Subject

Iowan Behemoth — 'Leviathan'

Iowan Behemoth

Crucible Industries CF-1 'Carapace'

Powered Exoskeleton — Industrial/Combat

1 / 3

Arcturus BH-2 'Marrow'

The BH-2 is a quadruped automaton roughly the size of a large dog, designed for a purpose so specific and so grotesque that even Arcturus — a company that manufactures spider-mounted flechette cannons — refuses to acknowledge its existence. The Marrow harvests calcium from living targets. It pins them, inserts a hollow proboscis through the skin into the nearest bone, and extracts calcium phosphate through a process of localized chemical dissolution that takes approximately ninety seconds per extraction site. The target remains conscious throughout. The pain is described as the worst thing survivors have ever experienced.

The extracted calcium is stored in an internal reservoir and is used by the BH-2 to reinforce its own chassis — the unit's armor is a composite of synthetic polymer and harvested human bone mineral, making it progressively harder to destroy the longer it operates. A fully loaded Marrow has an exoskeletal layer that can resist small-arms fire. The biological component of the armor also makes the unit difficult to detect with standard synthetic-material scanners, as it reads as partially organic.

Victims of BH-2 extraction develop severe osteoporosis at the extraction site within days. Bones become brittle, hollow, prone to fracturing under normal stress. The extraction process also introduces a chemical compound that inhibits calcium reabsorption, meaning the damage is progressive and permanent without expensive medical intervention. Three victims have died of bone collapse weeks after the encounter — their skeletons simply giving way under the weight of their own bodies.

The BH-2 operates primarily at night, in low-population areas where screaming is unlikely to attract intervention. It has been encountered in the deep Shelf, the Underworld fringe, and the wasteland. It does not kill its targets unless they resist extraction. It is, in its own horrible way, conservative — it takes what it needs and leaves. The fact that what it needs is the structural integrity of human bones does not factor into its operational calculus.

name	Arcturus BH-2 'Marrow'
classification	Resource Extraction Platform — Biological Material Harvesting
aliases	Marrow Bone Thief The Calcifier
manufacturer	ARCTURUS DEFENSE SOLUTIONS (DENIED)
tier availability	Tier 5 — black market, no authorized distribution
legality	Prohibited — classified as bioweapon
autonomy level	Fully autonomous predatory behavior
dimensions	0.8m height, 1.4m length, quadruped configuration
weight	65 kg (variable — increases with harvested material)
power source	Chemical battery augmented by exothermic reactions during extraction process
locomotion	Quadruped articulated legs, capable of sustained pursuit at 40 km/h
armament	Calcium extraction proboscis (hollow, diamond-tipped) Restraint limbs (front legs designed for pinning targets) Bone-mineral composite armor (progressive reinforcement)
sensors	Bone density scanner (identifies optimal extraction sites) Thermal tracking Acoustic monitoring
countermeasures	Heavy weapons capable of penetrating bone-mineral composite armor. The proboscis is the most vulnerable component — severing it renders the unit unable to extract or reinforce. Fire disrupts the organic armor component. The unit avoids well-lit, populated areas.
known deployments	Seventeen confirmed attacks in deep Shelf and Underworld fringe (2196-2200) Two wasteland encounters reported by courier guild
story hooks	A clinic in the Shelf is seeing a cluster of patients with inexplicable osteoporosis — all from the same block, all with identical puncture wounds they cannot explain Someone is selling bone-mineral composite armor on the black market — armor that genetic testing confirms contains human calcium
cultural context	The Marrow is nightmare fuel in the Shelf. Children dare each other to say its name three times in the dark. Adults check their door locks twice. The fact that it does not kill — that it takes something from you and leaves you alive to feel its absence — makes it worse than a weapon that simply ends you.