Grav-gun

A grav-gun is a rare Imperial weapon that warps gravity around its target, making it crushingly heavy or light enough to float. It’s a relic of the Dark Age of Technology, tightly guarded by the Adeptus Mechanicus, and prized wherever a bolter won’t do the job.

How a grav-gun works

A grav-gun fires a stream of particles that distorts the local gravitational field around whatever it hits. Depending on the setting, the target becomes dramatically heavier or dramatically lighter. The weapon gives off a deep bass rumble when it fires, because the gravity waves vibrate the air around it. That sound is more than atmosphere; it’s a warning that something nearby is about to get very heavy or very floaty.

At low power, the grav-gun is a capture tool. Enemies slow down, get pinned in place, or stop moving altogether, which makes it handy for taking prisoners alive. At high power it’s lethal. The pressure can rupture organs and crack bones right through armour, and a really large creature might simply be crushed under its own weight.

• Non-lethal at low settings, used to immobilize or take prisoners
• Lethal at high settings, crushing organs and bones through armour
• Excellent for demolition and siege work
• Devastating aboard starships or in null gravity

Why it matters on the battlefield

Grav-weapons aren’t standard issue. Every grav-gun is a relic from the Dark Age of Technology, and the Adeptus Mechanicus keeps them locked in its armouries, rarely letting one leave. Some Space Marine Chapters still maintain a handful, but that’s the exception. The underlying tech is understood well enough to use, not to mass-produce.

That scarcity makes a grav-gun a statement. If you see one on the field, someone with serious pull decided it was worth deploying. It’s also genuinely useful in the right circumstances. Against bunkers and fortifications, the weapon turns a building’s own mass against it and collapses the structure. On starships or in null gravity, where gravity tricks are extra disorienting, they’re devastating.

Origins

The graviton gun started life as a non-military tool for low-gravity environments. Its original job was making objects heavier so they’d stay put. Someone eventually realized that making things heavier was also a great way to ruin someone’s day, and the Imperium turned that principle into a weapon.

That industrial origin explains why grav-guns are so good at demolition. They’re basically repurposed equipment. The same gravitic reaction tech powers grav-vehicles like the Land Speeder, so the science isn’t unique to the weapon, just the application.

Patterns and users

Grav-guns come in several patterns, and the most famous is the Wrath. It’s highly modifiable, which makes it popular with Necromunda gangers and hired guns. House Van Saar fields its own Hystrar Mk.XII pattern. Heresy-era examples survive too, like the Autotellurian pattern, which still turns up in old records. The Deathwatch also carries a bigger cousin, the graviton cannon.

Space Marine Chapters, Inquisitors, and wealthy Rogue Traders are the most likely to have one. They’re rare enough that most Imperial forces never see a grav-gun in service.

Key facts

• Grav-gun is a rare Imperial grav-weapon dating back to the Dark Age of Technology.
• It fires particles that alter local gravity, making targets heavier or lighter.
• Low settings capture; high settings kill by crushing organs and bones through armour.
• Best used against bunkers, fortifications, and in zero-gravity environments.
• Originally designed for low-gravity industrial work, not combat.
• The Wrath pattern is common on Necromunda; House Van Saar uses the Hystrar Mk.XII.

FAQ

Related reading

• The Macharius
• Power Armour
• Land Raider
• The Adeptus Mechanicus
• The Deathwatch
• The Dark Age of Technology