The Galaxy Buster is a superweapon that can destroy an entire galaxy. It launches several Star Busters to all surrounding stars of the Galactic Core causing those stars to supernova and turn into black holes. These black holes gravitationally fight the Galactic Core causing them to combine into a large black hole. The extreme gravitational fields also causes more giant stars to supernova, causing a chain reaction that creates an enormous black hole that swallows the galaxy. After that, the enormous black holes shrinks down to the size of a pinhead, and then explodes sending a shockwave throughout the Intergalactic Void. Nearby stars in other galaxies 2 million lightyears from the target galaxy get destroyed from this aftershock.
The Galaxy Buster was first developed 5 million years ago by the Chch'ptk, an ancient race that is said to be the one of two races capable of intergalactic travel. Their plan was to quickly eliminate the Kklxin, a hostile alien race in a neighboring galaxy, who had also developed a proto-type Galaxy Buster. The original names of the two galaxies these races are from are unknown, so the galaxies are named after the respective race. The two aliens races engaged in a power struggle and eventually destroyed each other by launching the Galaxy Buster at their two galaxies. Both races were nearly wiped out, though few survivors are said to have build refuge homes in extragalactic systems close to the Milky Way galaxy. Their numbers were reduced from several trillion to several hundred.
Although the Chch'ptk and the Kklxin are largely indifferent, a few extremist Kklxin are said to be developing another Galaxy Buster and plan to destroy the Milky Way galaxy unless every sentient being agrees to become their slaves. It is widely dismissed as hoax, but a few Kklxin ships have been reported to be patrolling the outer arms.
Also, recently the Grox have stolen a Galaxy Buster from a Kklxin colony. This weapon was soon destroyed by an especially demented Flametrooper. The act of burning the weapon of destruction set it off, and the Flametrooper along with his three comrades barely escaped alive.