"Expect to go permanently deaf." - first line of The Tenth Thunder Artillery Handbook

The Thunder Cannon is the meanest Shooter in Nimbus: long-range, inflicts heavy damage, and can take a beating.

It doesn't fire as often as other Shooters, and it can only fire north, south, east, or west, and you must orient it in the direction you wish it to fire.

As you're preparing to build it, right-click to rotate the unit.