Spatial Distortion Generator

Spatial Distortion Generators are the only type of non-supertech fleetkiller class Weapon of Mass Destruction available to Mankind. It is a fruit born of the tree of hyperspace research that requires cutting edge technology, insane ammount of power and a ship of the size of colossi at the least.
It also suffers from long loading period (after which it has to be fired very soon... or the ship itself is going to end badly) that is detectable by devices available to most modern navies. And it also takes a lot of space and is pretty easily damaged by incoming fire. Making the least of known weaknesses of the weapon rather long.
On the other hand, it is also destructive and more than capable of wiping out entire enemy fleets with a single discharge. SDG can be summed up to a device that 'breaks' Reality at the target location, creating quickly expanding space where the Reality itself ceases to exist and laws of physis go for lunch. The growth of the break increases overtime as the laws of physics negating its expansion began to unravel, reaching even FTL speed.
Which could have made it a potential risk to the galaxy or even universe if not for the fact that the ship that carries it has to stay in a place for it to expand, and it is exactly as vulnerable to the effect of the Spatial Distortion Generator as every other material object. Even more, perhaps, since it cannot escape.
The ships devoured by SPG are either gone forever, or end up being ejected after the anomaly dissapears... in a form of either broken wrecks (bend and spatially rewritten into form that has very little to do with a working spaceship) or as a lot of particles.