The Star Dreadnought Assault Prototype was a prototype Executor-class Star Dreadnought used by the Imperial Navy during the Imperial Era. It was constructed surrounded by a large dock, running more than half the Star Dreadnought's length, in orbit above a cloudy celestial body.
Behind the scenes
The Star Dreadnought Assault Prototype was mentioned on a card of the same name in the 2019 Super Star Destroyer Expansion Pack for Fantasy Flight Games' miniatures game Star Wars: Armada. The card's image was illustrated by Matt Bradbury.