The Prism Cannon is the main gun of the Eldar Fire Prism grav-tank, and it’s one of the most flexible laser weapons in Warhammer 40k. It can drill a single tank-killing beam or scatter its shot to cut down whole squads, and it can link with another Fire Prism for a blast that levels almost anything.
How it works
The Imperium has captured working Prism Cannons, but studying them hasn’t gone well. What’s known is that it fires in two stages. A medium-power laser leaves the primary charge chamber, passes through an acceleration chamber, and gets trapped inside a huge crystal prism that intensifies it in a fraction of a second.
That energy then goes through a secondary prismatic lens. Adjustment motors shift it, so the gun can throw a tight, focused beam that punches through the heaviest armour, or a wide dispersed blast that scythes down infantry. Because the main crystal can be re-angled mid-shot, the beam keeps tracking a target even while it’s firing.
Linked fire and range
A Fire Prism’s targeting arrays let it feed its energy into a second Prism Cannon. Two tanks become one weapon, and the combined blast is strong enough to wipe out targets that would shrug off a normal shot.
Range is the other big advantage. The Prism Cannon reaches about twice as far as a Scatter Laser or Pulse Laser, so it can hit things barely visible on the horizon. That makes it a nasty anti-aircraft gun too, and it lets Eldar forces open a barrage before the enemy even knows they’re there.
- Two-stage firing: charge chamber, acceleration chamber, crystal prism, then a focusing lens.
- Two fire modes: a focused armour-piercing beam or a dispersed anti-infantry blast.
- Linked fire: two Fire Prisms combine into one far more powerful shot.
- Roughly double the range of a Scatter Laser or Pulse Laser.
- Exodite Eldar have mounted Prism Cannons on large dinosaurs.
Where you’ll see it
The Prism Cannon is the Fire Prism’s whole reason for existing, and the tank is built around it rather than carrying it as an afterthought. The same weapon turns up in Epic-scale games, where Fire Prism formations lean on linked fire to delete heavy targets at range.
It’s also a good example of how Eldar tech works in general: elegant, precise, and built to hit harder than its size suggests. If you’re facing one, the answer is usually to close the distance fast or spread out so a dispersed shot can’t catch a whole unit.
Key facts
- Main armament of the Eldar Fire Prism grav-tank.
- Two-stage firing process uses a crystal prism to intensify the shot.
- Can fire a focused anti-armour beam or a dispersed anti-infantry blast.
- Two Fire Prisms can link cannons for a far more destructive combined shot.
- Outranges Scatter Lasers and Pulse Lasers by roughly double.
- Exodite Eldar have mounted it on large dinosaurs.
FAQ
What is the Prism Cannon?
It’s the main laser weapon of the Eldar Fire Prism grav-tank. It fires a crystal-focused energy beam that can be tightened against armour or spread to hit infantry.
Can two Prism Cannons fire together?
Yes. A Fire Prism can channel its energy into another Prism Cannon, creating a single much more powerful blast that can destroy even the toughest targets.
How far does a Prism Cannon shoot?
About twice the range of a Scatter Laser or Pulse Laser, which also makes it useful against aircraft and for opening a battle with a long-range barrage.