Imperial-class Star Destroyer

The Imperial-class Star Destroyer (ISD) known generally as the Imperial Star Destroyer, was a product line of massive dagger-shaped capital ships of the Imperial Navy and later the Navy of the First Order. It consisted of two variants, the Imperial I-class Star Destroyer and the Imperial II-class Star Destroyer.

History
The Imperial Star Destroyer replaced the smaller Venator-class used by the Galactic Republic during the Clone Wars and was generally the Empire's star cruiser of choice.

At the height of its power, the Galactic Empire operated over 25,000 of these ships. The distinctive profile of the Imperial-class instilled fear into the soldiers of rebelling factions, and the name of a Star Destroyer could be preceded by the ship prefix ISD (for Imperial Star Destroyer). In a report to an admiral, Senior Commander Alecia Beck referred to the ISD Vehement.

Roughly thirty years after the Battle of Endor, the new Resurgent-class Star Destroyer would be constructed to replace the aging Imperial-class by the Empire's first successor state, the First Order, and would borrow design philosophies from the highly respected ship.