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Art: “Brother Liuvgild, Basilisk Lords Death Company” by Vitaly Perevoshikov, used with the artist's permission. source

Space Marines & Primarchs · Melee Weapon

Chainsword

The brutal motorised tooth-bladed sword carried by Space Marines, Imperial Guard officers and Chaos renegades, chewing through armour and bone with monomolecular teeth.

Adeptus Astartes (all Chapters)

Type: Melee Weapon
Origin: Adeptus Astartes (all Chapters)
Characters: 17
Units: 30

Illustrated by Vitaly Perevoshikov (“Brother Liuvgild, Basilisk Lords Death Company”, used with permission) · Additional gallery art by Jakub Palmowski (“There Is Only War — Imperial Guard Commissar & Staff”), George Earl Abalayan (“Chapter Master Malakim Phoros of the Lamenters”), George Earl Abalayan (“Jarl Ragnar Blackmane”) (used with permission)

Lore & history

The chainsword is the quintessential close-combat weapon of the forty-first millennium—an unapologetically savage marriage of medieval swordsmanship and industrial butchery. While more esoteric blades such as power swords or force weapons require rare field generators and centuries of artisan labour, a chainsword relies on a howling internal motor and a loop of spinning, razor-edged teeth that can be manufactured on almost any Imperial hive or forge world. From the mud-choked trenches of the Astra Militarum to the boarding torpedoes of the Adeptus Astartes, the revving snarl of a chainsword's engine is the universal prelude to a charge.

Though most closely associated in the popular imagination with the Imperium of Man, the chainsword is neither uniquely Imperial nor a recent invention. Ancient patterns were carried by techno-barbarian warlords during the Unification Wars on Terra, refined for the Space Marine Legions during the Great Crusade, and adopted in sleeker, near-silent forms by the Aspect Shrines of the Craftworld Aeldari—most famously the Scorpion's Chainsword of the Striking Scorpions—as well as the jagged, blood-caked chainblades of Heretic Astartes and Ork Mekboyz.

Within the Astra Militarum, a chainsword is a badge of rank and personal courage wielded by Commissars, Sergeants and officers—none more famous than Commissar Ciaphas Cain, whose lifelong drilling with a standard-issue Imperial Guard chainsword allowed him to parry everything from Ork warbosses to Genestealer Broodlords. Among the Adeptus Astartes, the heavier Astartes Chainsword is the primary armament of Assault Squads, Vanguard Veterans, Blood Claws and Primaris Assault Intercessors, who use the sheer mass of their ceramite gauntlets to drive the screaming teeth straight through breastplates and ribcages.

Most Brutal Battlefield Feat & Kill Record

Flesh Tearers Boarding of the Space Hulk Death of Integrity & Armageddon Refinery Purge

When Chapter Master Gabriel Seth led the Flesh Tearers into the claustrophobic, promethium-choked industrial under-hives of Armageddon and the corridors of the space hulk Death of Integrity, the roar of Mark XI 'Hell's Teeth' chainswords and two-handed Eviscerators drowned out even the thunder of Ork artillery. Across the war-torn annals of the Forty-First and Forty-Second Millennia, combat records compiled by the Departmento Munitorum, Ordo Malleus, and Ordo Xenos repeatedly cite the Chainsword—particularly in its Astartes Chainsword (Mark XI 'Hell's Teeth' & Indomitus Pattern), Eviscerator, Frost Blade configurations—as an instrument capable of overturning the tactical calculus of an entire theatre. Where lesser armaments falter against void-hardened battleplate, daemonic ichor, or xenos bio-chitin, this melee weapon brings to bear a lethality that leaves no margin for survival.

Trapped inside a collapsing refinery by Goff Clan Nobz outnumbering his vanguard ten to one, Seth and his Assault Squads gunned their throttle-grips to full revolution and met the greenskin charge blade-first—monomolecular adamantium teeth catching on iron jaw-plates and sawing straight through spines and hydraulic power klaws in pressurized geysers of arterial blood while Seth's relic Eviscerator, Blood Reaver, bisected the Ork Warboss from collarbone to hip. Eyewitness vox-logs and post-battle auspice scans from the engagement confirm that the sheer physical and psychological shock of the assault shattered the enemy's command cohesion within minutes. Imperial chainswords commonly use a single-edged housing with a protective back-spine so the wielder can brace the weapon, whereas many Chaos patterns expose both edges of the spinning track. Even heavily entrenched veterans who had weathered orbital bombardment broke formation when confronted with the visceral aftermath left in the weapon's wake.

In the aftermath of the slaughter, recovery teams and battlefield chroniclers documented the unmistakable signature of the Chainsword across every metre of the kill-zone. The Blood Angels and Dark Angels maintain ancient two-handed Eviscerators and relic chainswords in their Chapter armouries for boarding and breach assaults. To this day, commanders and champions who take the field with this panoply invoke that blood-soaked precedent, knowing that when the range closes and every safety governor is pushed to the limit, a single decisive salvo or stroke can break the spine of an entire invasion.

Source: Black Crusade: Core Rulebook (RPG), pg. 162; Codex: Chaos Space Marines (4th Edition), pp. 34, 84

Design, mechanism & battlefield effect

At its heart, a chainsword is a weighted blade-housing containing a high-torque micro-promethium or hydrogen-fuel-cell motor that drives a linked chain of monomolecular or tungsten-carbide teeth around a central guide track at blinding speed. Most Imperial patterns are single-edged, enclosing the return side of the chain within a reinforced protective spine so that the wielder can brace the back of the blade against his forearm or use it to bat aside enemy parries without chewing into his own armour. A cowled hand-guard protects the knuckles from flying bone splinters, sparks and snapped enemy teeth.

When the blade strikes a target, the warrior does not merely rely on the force of his swing. By squeezing a throttle bar built into the grip, he accelerates the tooth-track to maximum revolutions per minute just as the edge bites into armour plate or flesh. The angled teeth hook into the wound and pull the blade deeper, ripping away ragged chunks of ceramite, carapace and muscle while spraying a geyser of gore that deliberately intimidates nearby foes.

Because combat against heavily armoured enemies frequently snaps or blunts individual teeth, Astartes and Imperial Guard chainswords are engineered for rapid field maintenance. Replacement tooth-strips are carried in belt pouches, and a skilled warrior can pop the tension-lock on the housing, strip out a mangled chain, and thread a fresh loop of teeth in a matter of minutes between firefights.

Patterns, variants & doctrine

Countless variants of the chainsword exist across the galaxy. The standard Astartes Mark XI "Hell's Teeth" and the Primaris-issue Astartes Chainsword are far too heavy for an unaugmented human to swing effectively, featuring wider tracks and Kraken-tooth or adamantium-tipped links capable of sawing through light vehicle hulls. At the extreme end of Imperial craftsmanship sits the Eviscerator—a massive, two-handed chainsword fitted with a crude disruption field generator along its housing, favoured by Assault Marines, Sisters Repentia, and Redemptionist zealots to cleave straight through Terminator plate or bulkhead doors.

Among the Blood Angels and their Flesh Tearers successors, relic chainswords take on an almost liturgical status; Chapter Master Gabriel Seth wields the Blood Reaver, an enormous two-handed eviscerator chainsword whose teeth never stop thirsting for slaughter. Traitor Marines of the Chaos Legions frequently modify double-edged chainswords with barbed Daemonic teeth that shriek with the voices of trapped souls, while the Space Wolves forge frost blades whose chain-tracks are lined with diamonds or the fangs of Fenrisian ice-krakens.

Across ten millennia of total war, the Chainsword (Melee Weapon) has spawned numerous classified sub-patterns and field modifications. While standard production runs prioritize logistical interchangeability across warzones, elite formations covet pre-Heresy or master-artificer marks featuring hand-lapped containment assemblies, psycho-conductive firing relays, and over-pressured propellant or energy cells. Captured examples modified by Hereteks, Ordo Xenos Deathwatch armourers, or Freebooter Mekboyz frequently bypass factory safety governors entirely, turning every activation into a calculated gamble between devastating lethality and catastrophic overload.

Forge World Variations, Internal Mechanics & Artificer Visuals

Within the sealed armouries and forge-fanes that sustain Adeptus Astartes war-hosts, the Chainsword is produced and maintained across a spectrum of fiercely guarded sub-patterns, including Astartes Chainsword (Mark XI 'Hell's Teeth' & Indomitus Pattern), Eviscerator, Frost Blade. Unlike crude mass-produced armaments, every authentic example requires precise metallurgical and energetic calibration: from the high-density alloys and psycho-conductive matrices of its core housing to the volatile propellant, capacitor, or bio-symbiotic feed assemblies that power its lethality. Khorne-worshipping renegades in the Screaming Vortex and Eye of Terror prize modified chain-weapons such as the Flesh Render and Legion chainblades described in the Tome of Blood. Veteran armourers, Tech-Priests, Crypteks, Bonesingers, or Mekboyz obsessively tune the internal tolerances before each campaign, balancing cyclic output and thermal dissipation against the ever-present hazard of catastrophic overload during multi-week sieges.

Among Warhammer 40,000 illustrators, Golden Demon miniature painters, and diorama builders, the Chainsword is celebrated as one of the setting's most visually expressive focal points for weathering, contrast, and Object Source Lighting (OSL). Community artists emphasize the stark interplay between battle-chipped outer casings—scarred by sponge-applied metallic scratches, mud spatter, and sub-faction heraldry—and the intense chromatic focal glow of its active elements, whether rendered through violet-to-amber muzzle heat-bloom, crackling non-metallic-metal (NMM) power fields, incandescent plasma/gauss coils, or glossy multi-layered gore across serrated teeth. This devotion to micro-detail transforms every depiction of the Chainsword into a miniature narrative of ten thousand years of total war.

Notable patterns & relic examples

Astartes Chainsword (Mark XI 'Hell's Teeth' & Indomitus Pattern): The heavy, single-edged close-combat blade of Assault Marines and Assault Intercessors.
Eviscerator: A massive two-handed chainsword augmented with a low-level disruption field, wielded by Assault Squads, Sisters Repentia and Flesh Tearers.
Frost Blade: A Space Wolves master-crafted chainsword whose teeth are forged from Fenrisian ice-kraken fangs or diamond-hardened steel.
Scorpion's Chainsword: A whispering, psychically activated Aeldari chainblade wielded by the Striking Scorpions Aspect Warriors.

Deep Cuts

From the archives

Imperial chainswords commonly use a single-edged housing with a protective back-spine so the wielder can brace the weapon, whereas many Chaos patterns expose both edges of the spinning track. Source: Black Crusade: Core Rulebook (RPG), pg. 162; Codex: Chaos Space Marines (4th Edition), pp. 34, 84
The Blood Angels and Dark Angels maintain ancient two-handed Eviscerators and relic chainswords in their Chapter armouries for boarding and breach assaults. Source: Codex: Blood Angels (5th Edition) pg. 59; Codex: Dark Angels (4th Edition), pg. 48
Khorne-worshipping renegades in the Screaming Vortex and Eye of Terror prize modified chain-weapons such as the Flesh Render and Legion chainblades described in the Tome of Blood. Source: Black Crusade: The Tome of Blood (RPG), pg. 37; Codex: Chaos Space Marines (3rd Edition, 1st Codex), pg. 20
Forge World / Haemonculus Sub-Pattern Divergence: Beyond standard frontline patterns of the Chainsword, sealed armory registries document rare master-crafted variants—such as Ryza, Lucius, Deimos, or Stygies VIII marks for Imperial/Chaos patterns, or bespoke Craftworld/Cryptek/Mekboy tuning for Xenos equivalents—that trade thermal safety margins for a 30% increase in armor penetration or cyclic output. Source: Imperial Armour & Munitorum Vol. I
Machine-Spirit & Munitions Chemistry: Prolonged field firing or combat operation of the Chainsword leaves a distinctive ionizing, acoustic, or warp-resonant signature; veteran artificers and crews learn to read the weapon's micro-vibrations and exhaust discoloration to prevent catastrophic containment failure during multi-week sieges. Source: Forge World Horus Heresy Black Books

Wielded & Fielded By

Characters (17)

Ciaphas Cain · Commissar, Hero of the Imperium
Sebastian Yarrick · Commissar, Hero of Hades Hive
Gabriel Seth · Chapter Master of the Flesh Tearers
Ragnar Blackmane · Wolf Lord of the Space Wolves
Astorath the Grim · High Chaplain of the Blood Angels, Redeemer of the Lost
Haarken Worldclaimer · Herald of the Apocalypse
Fabius Bile · Primogenitor, Clone Lord
Sanguinius · Primarch of the Blood Angels, the Great Angel
Rogal Dorn · Primarch of the Imperial Fists, Praetorian of Terra
Leman Russ · Primarch of the Space Wolves, the Wolf King
Corax · Primarch of the Raven Guard, the Deliverer
Sigismund · First Captain of the Imperial Fists, founder of the Black Templars
Konrad Curze · Primarch of the Night Lords, the Night Haunter
Uriel Ventris · Captain of the Ultramarines 4th Company
Commander Dante · Chapter Master of the Blood Angels, Regent of Imperium Nihilus
Kayvaan Shrike · Former Master of Shadows (Chapter Master) of the Raven Guard
Ibram Gaunt · Colonel-Commissar of the Tanith First and Only