Munitions Bay

Sections of the Grenades arsenal

1. Fragmentation Grenades

   The fragmentation grenade — universally referred to in Imperial parlance as the frag — is the simplest of the six canonical patterns and the most prolifically issued munition in the Imperium's entire arsenal. Its principle is mechanical and ancient: a cylindrical casing of stamped steel encloses a charge of high explosive packed against an inner liner of pre-scored fragmentation jacket, often supplemented with thousands of small ball bearings or sharpened steel cubes seated in a polymer matrix. When the priming spring is released and the fuse runs through its three-to-five-second delay, the central charge detonates and the casing shatters along its scoring lines, propelling its lethal contents outward in an expanding cone of shrapnel that lacerates flesh, severs limbs, and renders unarmoured opponents into bloodless meat at radii of several metres. The frag grenade is the standard close-quarters munition of the Adeptus Astartes, two of which are issued to every battle-brother as part of his standard combat load alongside his bolter and his close-combat weapon. Astartes-pattern frag grenades are larger and heavier than their Guard counterparts, their casings thicker, their fragmentation matrix denser, and their charges calibrated to defeat the light armour of xenos warriors and lightly-armoured human cultists alike. The weight in a power-armoured fist is negligible; the throwing arc, propelled by enhanced post-human strength, can carry a frag grenade well beyond the throwing range of an unaugmented soldier. In Astartes squad doctrine, frag is used to clear room corners, suppress enemy positions during advance, and break the cohesion of any close-quarters formation that has elected to receive a Space Marine charge in massed order. For the Astra Militarum, the frag grenade is no less central to combat doctrine and considerably more numerous in absolute terms. Standard issue across virtually every regiment is two frag grenades per line trooper, with additional allocations to specialists, sergeants, and assault formations whose role calls for room-clearing aggression. A Cadian veteran's pouches carry frag the way a hive-ganger's belt carries shivs: at all times, in numbers, and with the practiced ease of a soldier whose first hand-thrown explosive killed his first enemy at fifteen years of age. The shouted command "frag out!" — a warning to friendly squad members that a casing has left the throwing hand — is recognised across regiments speaking dozens of dialects, the universality of the call reflecting the universality of the weapon it announces. The tactical role of the frag grenade extends across the full spectrum of Imperial close-quarters warfare. In the trench-fighting that defines theatres like Krieg and Vraks, frag is the primary tool of forward-position assault: tossed into a defensive emplacement to clear the occupants, dropped through a viewing slit to scour a bunker's interior, or hurled in volleys to suppress an entrenched enemy long enough for the assault to close the final metres. In urban warfare, frag clears hard corners and dismounts barricaded fighters; in tunnel actions, frag is the only practical weapon when ranged fire is denied by the geometry of the approach. The Departmento Munitorum's combat manuals identify the frag grenade as the universal answer to the universal question of what to do when an Imperial soldier finds himself within fifteen paces of an enemy he must kill quickly. The visual silhouette of the frag grenade has become iconic across the Great Crusade's descendant cultures: the segmented pineapple-shape with its raised fragmentation lines, the smooth lever held against the casing by the pin's tension, the loop at the pin's end that catches the trigger finger as the throwing arm cocks back. This silhouette is reproduced on regimental insignia, on tactical-doctrine illustrations, and on the pouch-stencils that mark a Guardsman's grenade allocation. So thoroughly has the frag-pattern penetrated Imperial visual culture that the silhouette serves as a common pictograph for "explosive ordnance" in regions where literacy is rare and pictographic warning signs must communicate the contents of a depot or the hazard of a transport's cargo. Among the Adeptus Astartes specifically, the doctrine of "cooking the fuse" — releasing the lever and counting one or two seconds of the three-to-five-second delay before throwing — is taught and practiced as a specialist technique that unaugmented humans cannot reliably perform. The reason is biological: a Space Marine's reaction time, neural-engineered nerve speed, and tolerance for the consequences of error all exceed the human baseline by margins that make a fractional-second timing window practical. The result is a grenade that detonates in the air above a defensive position, denying the enemy the chance to throw it back or take cover behind its blast-radius. The Astra Militarum explicitly forbids the practice in standard regimental drill — too many soldiers have been killed by frag-detonations in their own hands — but accepts that veteran storm-troopers and certain assault-specialist regiments will cook fuses regardless of doctrine, and quietly adjusts training to acknowledge the reality. Beyond the standard frag-pattern, the same casing geometry serves as the chassis for a small family of variant grenades issued to specialist formations rather than the line. The smoke grenade replaces the fragmentation matrix with a chemical compound that produces dense, light-occluding smoke for a duration of thirty to sixty seconds, used to break enemy line-of-sight during advance or to mark target areas for orbital fire-support. The hallucinogenic and psyk-out variants — most prominently the so-called RAG (Refractor Anti-Gnostic) grenade fielded by certain Inquisitorial retinues and by the Grey Knights in their hunts of warp-tainted enemies — replace the kill-charge with substances that disrupt psychic communion or destabilise the higher cognition of an exposed target. Scare grenades, an obscure pattern issued to certain Commissarial formations, deploy fear-pheromones tuned to the human nervous system and are used in mass-disorder suppression. None of these variants are standard line issue; all are encountered in field reports, all share the frag's external silhouette, and all are mentioned here so the reader understands that the fragmentation casing is a chassis as much as a weapon.

2. Krak Grenades (Anti-Armour)

   Where the fragmentation grenade scatters its lethality across a wide cone, the krak grenade does the opposite: it concentrates the entire energy of its charge into a single focused jet of superheated metal capable of punching through plate that bolt rounds would simply ricochet from. Its principle is the shaped charge — a doctrine of explosive engineering recovered from the same Standard Template Construct fragments that gave the Imperium its frag-pattern, refined across ten thousand years of forge-world iteration into the present standardised form. Inside the krak's cylindrical casing, a precisely-shaped cone of explosive surrounds an inverted copper liner; when the charge detonates, the liner collapses inward along the cone's axis and is forge-pressed into a hyper-velocity slug that emerges from the grenade's contact-face at velocities sufficient to pierce armoured ceramite, thick plasteel, and the cast plates of an enemy main battle tank's hull. The contrast with the frag grenade defines the krak's tactical identity. A frag is a weapon of crowd-killing — thrown into a position to lacerate everything within several metres. A krak is a weapon of precise armoured destruction — placed against, or thrown at, a single hardened target whose defeat opens an objective the squad needs to advance. The two grenades are issued together because they are complements rather than substitutes; a Space Marine carries both because he cannot predict whether the next obstacle will be a squad of unarmoured cultists or a sealed bulkhead through which an enemy command-staff is escaping. The Departmento Munitorum's tactical doctrine instructs every soldier to identify the target before drawing the casing: frag for living targets in open ground, krak for armoured targets and structures. The doctrine of attached detonation — placing the krak against the target rather than throwing it from distance — is encoded in the weapon's design and reflects the realities of shaped-charge geometry. A krak grenade detonated at standoff range loses much of its penetrating effect because the focused jet disperses with distance; a krak placed flush against the surface to be defeated delivers its full kinetic and thermal payload into the armour. Magnetic clamps along the casing's contact-face — present in higher-pattern krak grenades issued to Astartes and to certain elite Guard formations — allow the grenade to be slammed against the side of a vehicle and adhered firmly while the soldier withdraws to safe distance before the fuse runs through. Lower-pattern krak grenades issued to line Guard formations rely on the soldier's hand-pressure and the geometry of the throw to seat the casing against the target, a less reliable mechanism that veteran troopers learn to compensate for through technique. For Adeptus Astartes squads, krak is the squad-level answer to enemy armour at close range. A standard tactical squad's combat load includes one krak grenade per battle-brother in addition to the frag pair, allowing a ten-man unit to bring ten krak charges to bear against a target that resists ranged fire. The doctrinal application is direct: the squad-sergeant identifies the armoured threat, designates the brothers who will close to attached-detonation range, and the rest of the squad provides suppressive Bolters fire to cover the approach. This is the same tactical pattern recorded in Crusade-era field manuals and updated only in details across the millennia — proof that some answers to some problems are old, well-tested, and need no replacement. The Astra Militarum fields the krak grenade more sparingly than its frag counterpart, but the issue is universal across regiments expecting to face armour. A Cadian or Catachan trooper's combat pouches typically include one krak grenade as a hedge against the unexpected armoured contact; assault-specialist regiments and engineer formations carry several. Anti-tank Squads — small specialist teams trained in close-attached destruction of enemy armour — make the krak grenade their primary weapon, supplementing it with melta-bombs when the targets are heaviest. The kill-record of a successful Anti-Tank Squad is measured in tracked vehicles destroyed at arm's length, a metric that captures the specific bravery the role requires: to advance under fire to a vehicle's flank, place the casing, and withdraw before the detonation arrives. The conceptual kinship between the krak grenade and the Melta Weapons family deserves explicit acknowledgement. Both rely on the principle that armour is best defeated not by mass but by concentrated energy delivered at a single point: the krak through the kinetic-thermal jet of a shaped charge, the melta through the fusion-thermal beam of a sub-atomic reaction. A soldier trained on krak doctrine grasps melta doctrine intuitively, and Astartes Devastator instructors record that the tactical psychology of the close-attached anti-armour kill — the deliberate movement to within arm's reach of a thing that can crush a man, the placement of the weapon, the controlled withdrawal — translates directly between the two munition families. The melta-bomb, treated in its own section below, is the natural progression from krak doctrine for targets where the krak's penetration is insufficient. The risk of close-attached krak use is the inverse of its precision: a soldier who places a krak against a tank's flank is, by necessity, within arm's reach of the tank when the casing is committed. Veterans speak of the contraction of attention that close-attached anti-armour work demands — the deliberate exclusion of all peripheral concerns until the casing is seated and the fuse is running, followed by the urgent return of awareness to the tactical situation as the soldier withdraws. More than one Astartes battle-brother has placed a krak successfully and been killed in the same heartbeat by enemy fire he could not see while focused on the placement; more than one Guard anti-tank trooper has died holding the casing because the tank turned at the wrong moment. The grenade rewards courage with effectiveness, and the doctrine accepts the trade.

3. Melta-Bomb

   The melta-bomb is a hand-placed fusion charge that delivers, in a single instant of detonation, the same sub-atomic thermal reaction that the Melta Weapons of Adeptus Astartes Devastator squads project at range. Where a meltagun discharges its fusion-beam outward across metres of open air, the melta-bomb confines the reaction to the volume immediately beneath its contact-face: a sphere of plasma at temperatures exceeding the surface of a star, sustained for the fractional second required to vaporise centimetres of armoured plate, weld the wreckage of an interior crew compartment into a single fused mass, and propagate a thermal shockwave through the host vehicle that reduces its remaining systems to slag. The reaction is initiated by a pyrum-petrol cascade housed in the casing's reactor cell, the same fuel principle the meltagun uses, miniaturised and committed in a single use. There is no second shot; the casing is consumed in the detonation it produces. The melta-bomb's signature attachment mechanism — the magnetic clamp that fixes the casing flush against vehicle armour — is what distinguishes it from the krak grenade and from every lesser anti-armour munition in the Imperium's arsenal. A krak relies on shaped-charge geometry to drive a copper-jet projectile through plate; a melta-bomb requires no projectile at all, because its fusion reaction occurs in direct contact with the target. The clamp grips ferrous plate with sufficient force that no plausible vehicle manoeuvre can dislodge it within the fuse's running time; once attached, the casing is committed and the only remaining question is whether the soldier who placed it can withdraw to safe distance before the detonation arrives. The visual signature of a melta-bomb attached to a tank's flank — a circular casing the size of a soldier's helmet, the indicator-lumen on its housing showing fuse-active orange — is among the most recognisable images in Imperial close-assault warfare. The doctrine of the melta-bomb is the doctrine of the close-attached anti-vehicle kill at its purest expression, and it is the doctrine in which the Adeptus Astartes Devastator squads are specifically trained alongside their long-range melta and lascannon work. A standard Astartes Devastator squad's ammunition allocation includes two melta-bombs per battle-brother for engagements where the squad expects to encounter heavy armour — Land Raiders, enemy super-heavy variants, or the great war-machines of xenos opposition that resist all but the most concentrated thermal weapons. The squad-sergeant designates the brother who will close to attached-detonation range, the rest of the squad provides covering fire, and the brother selected for the placement does what every Astartes is trained to do: walks toward the killing thing without breaking stride, places the casing with mechanical precision, and withdraws as the fuse runs. Techmarines occupy a parallel and equally important role in melta-bomb doctrine, both as the specialists who maintain the casings between deployments and as the warriors most often called upon to use them in field demolition tasks. A Techmarine's command of the Adeptus Mechanicus sacred texts gives him a privileged understanding of the pyrum-petrol reaction's tolerances, the warning-signs of a damaged reactor cell, and the ritual procedures by which a casing must be checked and re-blessed before each combat issue. In the field, a Techmarine wielding a melta-bomb is a sanctioned destroyer of war-machines, the warrior whose hand will end a vehicle that no other weapon in the squad's load-out can defeat. The role is acknowledged in Chapter litany; the names of Techmarines who have closed with enemy super-heavy tanks and ended them with a single attached charge are read out at vigil in their armouries, in the same cadence that records the deeds of bolter-veterans and chainsword-champions. Manufacture of the melta-bomb is concentrated on a small number of forge-worlds, with Mars and several first-generation forge-temples retaining the privileged sanction to produce the pyrum-petrol reactor cells that drive the fusion reaction. Lesser forge-worlds may produce casings, magnetic clamps, and the outer fuse housings; the reactor cells themselves come exclusively from sanctioned manufactory-temples whose Magos Explorator have been ordained in the specific doctrines of fusion-cell consecration. The result is a weapon issued in far smaller quantities than the frag or krak — a Devastator squad may receive several per engagement, but a line Guard regiment will go entire campaigns without any allocation at all. The melta-bomb is reserved for those formations whose role demands the weapon and whose warriors have the training to use it without wasting the issue. The relationship between melta-bomb and krak is a doctrinal hierarchy rather than a tactical equivalence. The krak grenade defeats armour up to and including main battle tanks of standard pattern; the melta-bomb defeats armour beyond what krak can reach — heavy super-heavy variants, fortification gates, the hide of Great Crusade-era relic war-machines that walk the Imperial battlefield to this day. A soldier presented with a target the krak can defeat will use the krak; a soldier presented with a target only the melta-bomb can defeat must commit the rarer charge. The discipline lies in correctly reading the target — wasting a melta-bomb on something a krak would have killed is a sin against the Mechanicum's sanctioned manufacture, while attempting a krak placement against a target requiring melta-grade thermal output is to commit oneself to a kill that will not occur, with consequences for the squad that follow. The act of attaching a melta-bomb is, by long Imperial tradition, treated as a sacrament of close courage. The soldier or Astartes who walks to a tank's flank and places the casing has chosen, in that moment, to stand within metres of a fusion detonation that will kill anything organic within its blast radius if the withdrawal is mismanaged. Imperial chaplains who minister to Astartes formations record specific prayers for melta-bomb deployment — the Litany of the Fixed Charge, the Benediction of the Fuse-Light, the Final Words for those whose withdrawal will be marginal. The casing is checked, the magnetic clamp is engaged, the fuse is armed, and the soldier turns and runs. The detonation follows. What remains is wreckage, the smell of fused armour and pyrum-petrol residue, and the soldier — if he was fast enough — alive on the ground at the engagement's edge, breathing the heat-shimmer of his own kill.

4. Plasma Grenade

   The plasma grenade is the rarest of the standard-issue Imperial throwing patterns and operates on a principle that no other grenade in the Imperium's arsenal duplicates: rather than detonating a chemical or fusion charge, it triggers the deliberate failure of a miniaturised plasma containment field, releasing the captive thermal mass within the casing into the surrounding volume in a single uncontrolled discharge. The reaction is kindred to the reactor cores that drive the Plasma Weapons of Astartes plasma-gunners and the larger plasma cannon mounts of certain Imperial vehicle classes, but where those weapons project their plasma in a controlled beam through carefully-engineered focusing apertures, the plasma grenade does the opposite — it unmakes the field that holds the plasma in place, and the captive sun within is released to do whatever its uncontained temperature directs. The technical principle is one of inverted engineering: a plasma weapon's success is the maintenance of containment; a plasma grenade's success is its failure. The casing houses a small reactor that builds plasma to combat-ready charge state during arming, then suspends the charge under containment for the throwing window — typically four to six seconds before the field destabilises automatically and the charge is released. Imperial doctrine teaches that the plasma grenade should be thrown into the air on a flat trajectory and detonated above the target rather than against it: the dispersal of the plasma cloud across an arc above an enemy formation produces the casualty profile the weapon is designed to achieve, with bodies caught beneath the cloud burned from above by temperatures sufficient to slag ceramite armour from the angles armour was never designed to defend. The rarity and risk profile of the plasma grenade restrict its issue to formations whose discipline can be trusted. A plasma grenade dropped from the wielder's hand mid-arm — the result of a hit during the throwing motion, or a misaligned grip — will detonate against the soldier rather than the enemy, and the result is the same as any plasma weapon misfire: the soldier ceases to exist in any recognisable form, and the surrounding squad is endangered by the heat-burst. For this reason the Adeptus Mechanicus sanctifies plasma grenade issue with greater stringency than any other variant in the standard pattern set, and field handling protocols specify that the casing must be carried in dedicated insulated pouches isolated from other ordnance until the moment it is drawn for the throw. Among the Adeptus Astartes, plasma grenades are most commonly issued to elite squads — Sternguard veterans, Honour Guard formations, and the bodyguard retinues of senior officers — whose accuracy and discipline can be relied upon to deliver the casing on the intended trajectory without misfire. Inquisitorial retinues, particularly those of the Ordo Hereticus and the Grey Knights in their hunts of warp-tainted enemies, also field plasma grenades when the targets are heavy infantry whose armour resists frag and krak but whose density does not warrant the rare melta-bomb. The doctrine in these formations is the same: the plasma grenade is reserved for moments when the volume of fire required to break a position cannot be supplied by other means, and the controlled risk of a deliberate field-failure is judged worthwhile against the gain. The comparison with the frag grenade reveals the plasma grenade's specific tactical niche. Frag delivers area lethality through fragmentation; plasma delivers concentrated thermal lethality through high-temperature dispersion. A frag grenade thrown into a squad of cultists kills perhaps a dozen with shrapnel; a plasma grenade thrown into the same squad melts perhaps half that number into pools of slag and superheated bone, but does so with a finality that no fragmentation pattern achieves. Where frag wounds and breaks cohesion, plasma terminates outright. The two weapons are not substitutes; the plasma grenade is the answer to enemies whose armour or biology renders fragmentation insufficient, and against whom thermal output is the doctrinally correct response. The visual signature of plasma grenade detonation is unmistakable to any soldier who has witnessed it. Where a frag's detonation produces grey-white smoke and a wall of fragmentation; where a krak produces a sharp orange flash and the metallic ringing of armour-defeat; where a melta-bomb produces the deep red-orange glow of fusion-temperature contact, the plasma grenade produces a momentary discharge of pale cyan-white light, like a captive star released for one heartbeat into the world, accompanied by a high-pitched ionic crack and the after-image of a blue-white halo that lingers in the witness's vision for seconds afterward. Imperial chaplains record the visual signature of plasma detonation as one of the closest physical analogues to the Emperor's light — a comparison the Mechanicum resists on theological grounds but cannot definitively refute.

5. Demolition Charge

   The demolition charge stands at the edge of the grenade family rather than at its centre. Where the frag, krak, and melta-bomb are weapons of throw or close-attached use, the demolition charge is fundamentally a weapon of placement — a larger explosive payload affixed in advance of detonation, timer-fused to allow the soldier who placed it to withdraw to safe distance, and committed against targets too large or too hardened for the smaller patterns to defeat. The Imperium's munitions taxonomy classifies the demolition charge alongside the throwing grenades on the doctrinal logic that both are hand-deployed explosive ordnance in the close-quarters envelope, even though the demolition charge's deployment profile differs in every operational particular. The reader unfamiliar with this convention should understand: the engineer's satchel is grenade-kin in the same sense that the eviscerator is sword-kin — a member of the family by structural inheritance rather than by visual resemblance. The standard pattern of Imperial demolition charge takes the form of a satchel-mounted explosive package containing several kilograms of high-yield compound, fitted with a timer fuse adjustable across a range of seconds to several minutes, and equipped with an external priming control that activates the timer when the soldier judges placement complete. Larger variants — the breaching charge, designed for blowing fortified doors and bulkheads, and the denial charge, designed for the deliberate destruction of strategic infrastructure — share the basic chassis but scale the payload appropriately for the target. The breaching charge is shaped to focus its detonation against a flat surface in much the same principle as the krak grenade, but at scales that defeat fortification-grade plate where a single krak would only score the surface. The denial charge is the heaviest variant in regular Imperial issue, a man-portable demolition package whose detonation can collapse a tunnel, drop a bridge span, or render a captured industrial complex unusable to a withdrawing enemy. The doctrine of the demolition charge places it firmly in the hands of engineer formations and specialist troopers across the Astra Militarum's order of battle. Engineer companies — the Combat Engineers, the Pioneer Battalions, and the regimental Demolition Specialists — are the formations whose training centres on placement, timer-management, and the tactical patience that demolition work demands. A demolition charge cannot be hurled like a frag; it must be carried to the target, fixed in place, the timer set, and the soldier withdrawn before the fuse runs through. The discipline of the engineer is a discipline of forward movement under fire, calm placement work in conditions where calmness is least available, and orderly withdrawal as the timer counts down through its committed seconds. Imperial training records include extensive material on the psychology of timer-management — the temptation to set short fuses to shorten one's own exposure, balanced against the fatal error of setting a fuse so short the placement-team cannot clear the blast radius before detonation. Among the Adeptus Astartes, demolition charge work is most often the province of Techmarines and of the assault formations whose tactical role includes deliberate fortification-reduction. The Techmarine carries demolition charges as part of his standard battle-load, the casings sanctified through Mechanicum rite and the timers calibrated to the specific tolerances his squad-sergeant has trained him to expect. In Astartes siege doctrine, the demolition charge is the natural escalation from the krak grenade for fortification work: where krak defeats armoured plate at squad-room scale, the breaching charge defeats fortification gates and reinforced bulkheads at fortress scale. The chronicled engagement records of Great Crusade-era siege actions describe Techmarines and assault-brothers placing breaching charges against gates that the same warriors had previously failed to crack with massed krak fire — the demolition charge succeeding where the smaller pattern had failed. The comparison between demolition charge and melta-bomb illuminates a tactical division that Imperial doctrine treats with deliberate distinction. The melta-bomb is the immediate weapon: placed and detonated within seconds, suited to vehicle kills where the target may move and the placement window is brief. The demolition charge is the patient weapon: placed and timer-set, suited to fixed targets where the placement-team has time to position the charge precisely, calibrate the fuse, and withdraw in good order. A vehicle requires a melta-bomb because a vehicle moves; a bunker accepts a demolition charge because a bunker does not. The two munition types occupy adjacent rather than overlapping niches, and a properly-equipped Astartes siege detachment carries both — the melta-bomb for the supporting vehicle that arrives to relieve the bunker, and the demolition charge for the bunker itself. The arming ritual of the demolition charge is, by long Imperial tradition, a matter of formal procedure rather than mere tactical action. The placement is followed by the verification of seating, then the fuse-cap is removed, the timer is dialled to its committed setting, the priming-control is rotated to the armed position, and the indicator-lumen is observed to display fuse-active. Each step in this sequence is recited by the engineer or Techmarine performing the work — the words varying by regiment and Chapter but the cadence universal — and any deviation from the recited steps is corrected by the squad before the team withdraws. The discipline is not mere ritual; it is the prevention of error in conditions where error is fatal. A demolition charge whose fuse has not been correctly armed will not detonate, leaving the assault unable to proceed; a charge whose timer has been mis-set may detonate while the placement-team is still within the blast radius. The recitation enforces the procedural verification that distinguishes successful demolition work from accidental self-destruction. The role of the demolition charge in Astartes siege warfare extends beyond the destruction of static targets to the deliberate reshaping of the tactical battlefield. Charges placed to collapse approach corridors deny the enemy a route of advance; charges placed to drop bridges over chasms strand enemy formations in positions where they can be reduced at leisure; charges placed to destabilise the foundations of an enemy command-spire bring down the leadership and the defending force together. The chronicled siege of certain hive-world fortresses — recorded in the deep archives of the Adeptus Mechanicus and replayed in tactical instruction across the Chapters — describes loyalist demolition teams reshaping the urban geography of contested sectors so completely that the surviving traitor formations were forced into killing-grounds the engineers had pre-mapped before the assault began. The demolition charge in this application is no longer merely a weapon — it is a tool of strategic-scale terrain editing, the engineer's act of imposing the Astartes commander's will upon the very stone of the battlefield.

6. Cyclonic Warhead

   The cyclonic warhead occupies a place in the Imperial munitions catalogue that no other ordnance described in this page approaches: it is, at full scale, an exterminatus-tier weapon — a planetary-grade thermal-kinetic device whose detonation can render an entire world uninhabitable through atmospheric ignition, magnetic-pole disruption, and surface-strata cracking. The weapon's deployment in its standard scale is the privileged decision of an Inquisitorial seal authority, requiring the formal declaration of an extremis-grade threat — a planet whose population has been corrupted past redemption, a Horus Heresy-grade infestation of warp entities, a xenos infection that no lesser response can purge. The cyclonic warhead at this scale is delivered from the orbital strike capacity of an Inquisitorial vessel and is the answer to questions whose other answers have all failed. What concerns the present discussion of the grenade family is the existence of miniaturised, man-portable cyclonic variants — ordnance scaled down from the planetary device to a casing size that a single warrior can carry into combat. These are extreme-rarity weapons, manufactured under the most stringent Mechanicum and Inquisitorial sanctions, and issued only to formations whose authority and discipline are beyond doubt. The man-portable cyclonic warhead retains the principle of its larger sibling — the cascading thermal-kinetic reaction that makes the weapon's name appropriate — but at scales suited to the destruction of underground fortifications, the deep cleansing of warp-tainted ritual chambers, or the elimination of xenos hive-cores too deeply embedded for orbital strike to address. Its detonation is small in cyclonic terms but enormous in grenade terms: a single such casing can vaporise an Imperial city block and leave the underlying soil glowing with residual energy for months afterward. Authority over man-portable cyclonic warhead issue rests almost entirely with the Ordo Malleus and the Grey Knights who serve as that Ordo's chamber-militant. The Grey Knights' wars against daemonic intrusion frequently encounter targets whose defeat by lesser munitions is impossible — daemon-engines whose physical bodies regenerate from any conventional damage, ritual chambers whose continued existence threatens to open a permanent warp-rift, structures that must be unmade rather than merely destroyed. For these targets the cyclonic warhead is the weapon of last resort, and the Grey Knights' chronicled deployments of the man-portable variant include some of the most extreme single-warrior actions recorded in any Astartes order's history. The casing is carried, the target is reached, the priming sequence is initiated, and the warrior — almost without exception — does not return. Beyond the Ordo Malleus, certain other Inquisitorial Ordos retain the right to issue cyclonic warheads under specific circumstances: the Ordo Hereticus for cases of heretical infestation that exceed standard purgation methods; certain elements of the Ordo Xenos for xenos targets of a tier where standard weapons fail. In all cases the issue is sealed by Inquisitorial authority, the deployment is authorised in writing by a senior Inquisitor, and the casing is tracked through manufacture-to-detonation chain of custody by the Adeptus Mechanicus forge-temples that produced it. No cyclonic warhead deployment is unrecorded; no use goes unaccounted; the weapon is too consequential and too rare to permit the casual battlefield treatment afforded to lesser ordnance. The doctrine is clear: a cyclonic warhead is not deployed to win a battle but to end a problem whose continuance threatens the Imperium at scales above the merely tactical. The doctrine of the cyclonic warhead as a weapon of last resort is preserved in the same Inquisitorial training that selects warriors for the Ordo Malleus's most dangerous assignments. The reading is solemn and explicit: this weapon is the answer to questions whose other answers have failed; the warrior who carries it must understand that his deployment of the weapon will, in the great majority of recorded cases, conclude with his own death; the act of arming and committing the casing is a dedication of the warrior's life as part of the weapon's effectiveness. The Inquisitorial chaplains who minister to Grey Knights formations record specific rites for cyclonic deployment — the Last Communion of the Carrying Warrior, the Final Litany of the Sealed Casing — and the names of warriors who have completed their cyclonic deployments are read at vigil across the Ordo Malleus's recorded history. Few names are read; the deployment is rare. But every name represents a problem ended, and every name is honoured. Adjacent to the cyclonic warhead in the Imperial taxonomy of last-resort ordnance stands the vortex device — kindred in theoretical lineage and similarly extreme in deployment, but distinct in mechanism and arguably more profane. Where a cyclonic detonation produces thermal-kinetic destruction, a vortex device opens, for a brief and unstable interval, a localised tear in the fabric of reality itself, drawing the matter within its event horizon into the warp before the rift collapses. Vortex grenades are recorded in Imperial archives as relics rather than standard issue — pre-Heresy patterns recovered from forge-world deep-vaults and deployed only under the most extreme sanction, often with consequences that exceed the original tactical intent. The vortex device's similarity to the cyclonic warhead lies in its role as a weapon of absolute final answer; its difference lies in the theological discomfort the Mechanicum and Ecclesiarchy alike feel toward a weapon whose effect cannot be cleanly described in the doctrine of pure detonation. Both weapons end what nothing else can; the cyclonic warhead does so with fire, the vortex device with the unmaking of reality. Both are mentioned here because both occupy the same final shelf of the Imperial arsenal — the shelf reserved for the answers no one wishes to need.