Cannon

Cannons were gaijin devices which used gunpowder to launch a projectile at high speed. They could be used as siege engines or onboard ships.

Merenae and Thrane
The Merenae and Thrane Kingdoms had the technology to produce firearms. Rokugan first saw the cannons during the Battle of White Stag when a gaijin fleet led by Garen Hawthorne used them to kill the Empress Hantei Yugozohime. Since then, the use of guns and cannons had been strictly forbidden in Rokugan.

Shadowlands cannons
In the Battle of Broken Waves the tainted ship Bitter Flower was seen with living beast cannons. They did not use gunpowder to fire their volleys.