Honestly, I have to share the credit/blame for this with Siren. The overall idea and development are mine, but he's the one who prodded me to actually post it, and provided a bit of feedback (and suggestion to include the Shard). Go to Comment
Boom, indeed. It'd be a particularly nasty weapon if fired at a pack of thaumavores like the Whisps; they'd absorb a tremendous dose of aether, overload, and detonate in fallout reactions pretty much at the same instant as the pulse shreds the world, making it the equivalent of a radioactive blast. Go to Comment
I think the worst component of this would be for the soldier at the epicenter, witnessing the ripples preceding the event, and realizing he's too close to the heart of it to escape. The kind of sudden fear, panic, and apathetic despair that would have to crash over him in that moment would potentially be as destructive as the weapon itself; I imagine some commit suicide before the detonation occurs, if they know what's happening. Go to Comment
You're correct; I imagine mock assemblages of components would relatively common among the less-prosperous states, leading to a kind of cold-war state where everyone distrusts everyone else. Ulfdin likely has a top-grade counter-spy network in place to protect their control over the key components of the devices, and that there are probably those among their welathiest rivals trying to reverse-engineer one of the cannons in order to create their own...