A Black Hole Bomb (called an SSPGD by many Non-Borealis nations) is a large bomb utilizing the Penrose process proposed by Roger Penrose. These weapons are the most powerful weapon a civilization could feasibly utilize.
Method
For a Detailled explantaion of the Penrose Process, See Penrose Sphere
Using the ring-shaped singularity passing enormous kinetic energy to an object that has fallen into the black hole, energy is recovered or dissipated exponentially from the black hole.
Cover the periphery of the ergosphere with a mirror of mass about the size of an asteroid and shoot electromagnetic waves inside. The shot energy is bounced back with greater energy each time it passes through the ergosphere. This is called “superradiant scattering”.
In other words, energy continues to double and expand. If the energy obtained in this way is expelled, it will be a bomb that exceeds the supernovae.
Power
The power of a bomb is worthy of Hypernova for a super massive black hole. Astronomical areas can be destroyed and vaporized. Some explosions even rival the brightness of entire galaxies.
Historical Uses
Black Hole Bombs are confirmed to have been the cause of the fall of the Providence Union. It is unknown who triggered them.