The conversion beamer is a rare heavy weapon that turns matter into raw energy, hitting hardest against the most heavily armoured targets. It’s slow, enormous, and nearly lost to the Imperium, which is exactly why it feels special when one shows up on the tabletop or in the lore.
What it does
A conversion beam projector fires a high-intensity beam that converts matter into pure energy. The denser the target, the worse it gets: armour plate, tank hulls, and buildings all get torn apart as their own mass explodes outward.
The beam also grows more intense the further it travels, converting the surrounding atmosphere as it goes. Eventually it hits a point where it can’t hold together any more and detonates violently. So a conversion beamer is at its most lethal at range, not point-blank.
Why it’s so awkward to use
These things are massive. They need banks of huge capacitors running along the projection tube, and the whole assembly has to stay absolutely still while firing. Move even slightly and the beam’s intensity collapses, wasting the shot.
That’s why you’ll usually see them mounted on wheeled carriages or anti-gravity platforms, with the operator standing well back and firing by remote. Smaller hand-held versions exist, but the user has to wear clawed boots just to stay planted.
There’s also a charge-up delay. It’s only about a second, but that’s plenty of time for a target to move or slip out of the firing arc.
Who actually fields them
During the Great Crusade, the knowledge to build and maintain conversion beamers was almost entirely lost. They could still be made, but it was a painful process. Two Legions stood out for fielding them in numbers.
The Dark Angels used them en masse against the horrors they were sent to fight, and the Iron Hands could reproduce and stockpile them thanks to their tech-savvy culture. For everyone else, a conversion beamer was a relic.
- Dark Angels: deployed them in large numbers during the Great Crusade.
- Iron Hands: maintained stockpiles through their technical expertise.
- Everyone else: rare, dangerous, and hard to keep working.
Variants and mounts
The heavy conversion beamer is the bigger, nastier version, an ancient relic-weapon that shows up on Contemptor Dreadnoughts, Decimator Daemon Engines, and Deimos Pattern Predator Executioners.
There are also rarer patterns: the inversion beamer on Saturnine Dreadnoughts, the conversion beam obliterator on Imperial Knight Defenders, and the conversion beam cannon on Knights Asterius, one of the largest surviving examples of the technology.
| Variant | Common mount |
|---|---|
| Heavy conversion beamer | Contemptor Dreadnought, Decimator, Deimos Predator Executioner |
| Inversion beamer | Saturnine Dreadnought |
| Conversion beam obliterator | Imperial Knight Defender |
| Conversion beam cannon | Knight Asterius |
Key facts
- A conversion beamer turns matter into pure energy, so denser targets take more damage.
- The beam intensifies with distance and eventually explodes at an inflection point.
- It must stay perfectly still while firing or the shot is wasted.
- Charge-up takes about a second, giving targets time to move.
- Dark Angels and Iron Hands fielded them in numbers during the Great Crusade.
- Variants include the heavy conversion beamer, inversion beamer, and conversion beam cannon.
FAQ
Is the conversion beamer good against infantry?
It’s built for dense, armoured targets. Light infantry won’t produce much energy from the conversion, so the weapon is wasted on them compared to tanks or buildings.
Why does the beam get stronger at range?
It converts the surrounding atmosphere as it travels, so the beam keeps building intensity. Past a certain point it can’t sustain itself and explodes.
Can a Space Marine carry one?
Not comfortably. Full-sized beamers need carriages or anti-grav platforms. Smaller hand-held versions exist but require clawed boots for stability.