The Star Dreadnought Command Prototype was a prototype Executor-class Star Dreadnought used by the Imperial Navy during the Imperial Era. At some point, the Star Dreadnought was escorted through space by several Imperial II-class Star Destroyers. It was equipped with sublight engines.
Behind the scenes
The image of the Star Dreadnought Command Prototype is a modification of a picture originally created for the 2009 Star Wars Legends reference book The Essential Atlas, where it was used to depict the Executor class Reaper.