Interdictor class Star Destroyer

when engaged, simulate the presence of a medium-sized planetary body and in particular the effect such a body would have on hyperspace travel. This can be used for two purposes, to prevent vessels entering hyperspace, and to force craft currently in hyperspace to revert to sublight speeds.
The Interdictor class Star Destroyer is a special-purpose vessel, the first warship class of the Imperial Starfleet to incorporate gravity well generators as standard equipment. These generators,