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...
They are, indeed, fairly expensive; given their sheer bulk and come delicate components, they're not battlefield-portable, so they tend to be emplacements. Ulfdin tends to see a fair surplus to their treasury whenever one gets comissioned, as they have the secret of growing the 'warp crystals' that help focus the transformation effect. I expect other nations are vigorously researching the method of creation, but as the sub suggests, it involved less than pleasant methods to divine the secret. That said, it's only a matter of time and will, and I'm sure that eventually you'll have battlefields that have soldiers equipped with firearms equivalents of Uther Doul's Possible Sword, each firing producing a swarm of nigh-bullets.
A Cold War situation is highly probable as a result of their creation, yes. Go to Comment
That was the chief inspirational effect, yes. Rather than a sustained and steady operative field, this is a split-second pulse of utter devastation. The Device is a bomb with fallout. The Cannon is just a devastating gun. Go to Comment
Something to consider is that powerful countries don't necessarily have the resources to field a large number of these. Depending on any number of factors, these could result in a global Cold War, or roughly the equivalent to the US after WWII, when we were the only ones with The Bomb for a while.
Heck, you only need one to be the most dangerous world power. Go to Comment
This is fantastic. I imagine they are relatively more expensive than nuclear weapons in our world, hence a powerful nation might only employ a handful of these, correct? Then, I would think that most war efforts would consist of espionage and sabotage, locating and deactivating these weapons so that a conventional invasion would be possible. Very very good submission, and an easy 5. Go to Comment