Two-wave gravshock

The Two-Wave Gravshock Device (sometimes known as the Two-Wave Gravshock, the Gravshock Device or simply the Planetbuster) was an Imperial superweapon that manipulated gravity on a planetary scale.

The Two-Wave Gravshock was a large, power-hungry aparatus which used gravwaves to affect a planet's gravitic field, thus causing effects that resembled earthquakes or tidal waves. During development, it was discovered that the effect of low-level gravwave broadcasts could also be used to determine the interior composition of a planetoid, offering non-military applications in exploration and mining.

Two problems were discovered during the testing phase of the project. The initial prototypes were carried within the hulls of modified Torpedo Spheres, which proved capable of mounting attacks on city-sized targets; but only the drives of Super Star Destroyers were thought to have sufficient power to mount attack on a fully planetary scale, and a Super Star Destroyer had no need of such a device to supplement its turbolaser and concussion missile batteries. Perhps equally seriously, the gravitational disruption caused severe navigational problems for ships in orbit, including the vessel carrying the Two-Wave Gravshock and any escorts it might have.

While it is known that the Gravshock Device was successfully tested, no evidence exists to show that it was ever used in front-line deployment.