The ion cannon is a heavy T’au weapon that fires a stream of ionised particles, and it shows up on everything from battlesuits to starships. It’s the T’au answer to an Imperial lance: less punch than a railgun, but more shots and a nasty secondary effect when it hits.
What the ion cannon actually does
It works by generating a stream of high-energy ionised particles and accelerating them with an electromagnetic field. When the stream hits, those particles react explosively with the target, dumping huge amounts of energy at the atomic level. The result is vaporisation, which spreads the damage even further.
That makes it a versatile anti-armour and anti-infantry weapon. Starship-mounted versions are broadly comparable to Imperial lances, so the T’au use them to punch through void shields and hull plating alike.
Main variants
The ion cannon isn’t one gun, it’s a family. The core design scales up and down depending on what’s carrying it, and a few specialist patterns exist for specific battlesuits and ships.
| Variant | Mounted on |
|---|---|
| Ion cannon | Hammerhead and other large T’au vehicles |
| Long-barrelled ion cannon | Manta |
| Tri-axis ion cannon | KX139 Ta’unar Supremacy Armour |
| Heavy ion cannon | T’au Navy starships |
| Ion scattercannon | Warmaker battlesuits |
How it compares to other T’au weapons
The railgun is the T’au’s single-target killer, a solid slug that punches through almost anything. The ion cannon trades that raw penetration for a stream of fire and explosive impact, so it’s better against massed targets or when you want multiple hits.
Pulse weapons sit below both in scale. They’re the standard infantry and light-vehicle guns, while the ion cannon is what you bolt onto a Hammerhead or a Riptide when you need something heavier.
Where you’ll see it in the lore
The ion cannon is a staple of T’au battlesuit and vehicle design. The XV104 Riptide carries one as its main armament, and it’s a common sight on Hammerheads and Manta gunships.
In Battlefleet Gothic, T’au ships mount heavy ion cannons as their main broadside batteries, giving their fleets a reliable way to trade blows with Imperial cruisers.
Key facts
- The ion cannon fires a stream of high-energy ionised particles accelerated by an electromagnetic field.
- On impact, the particles react explosively with the target, causing vaporisation and spreading damage.
- Starship-mounted versions are comparable in power to Imperial lances.
- Common variants include the long-barrelled, tri-axis, heavy, and scattercannon patterns.
- It’s mounted on the Hammerhead, XV104 Riptide, Manta, KX139 Ta’unar, and T’au Navy ships.
FAQ
Is the ion cannon better than a railgun?
Not better, just different. The railgun is a single high-penetration shot, while the ion cannon fires a stream of particles that explodes on impact, so it’s more flexible against different target types.
What’s the difference between an ion cannon and an ion rifle?
Scale and role. The ion rifle is a personal weapon for T’au infantry, while the ion cannon is a heavy weapon mounted on vehicles, battlesuits, and starships.
Do other factions use ion cannons?
The ion cannon is a T’au design. Other races have their own equivalent technology, but the term usually refers to the T’au weapon.