The ship has approximately 32 sublight engines, which wae improvements upon the sublight engine system aboard the two Death Stars. It also possesses at least six fusion reactor complexes at the Starboard, allowing for redundancy and increased damaged resistance. Its size was gargantuan, easily outclassing all known ship sizes in galactic history, including the Star Dreadnoughts of the Galactic Empire, the trophy battlecruisers used by wealthy citizens of the waning days of the Old Republic, and even the various reconstructed versions of the flagship used by Xim the Despot.

The Supremacy was the sole Mega-class Star Dreadnought in the First Order's service with a colossal wingspan of 60 kilometers. Its construction was undertaken on an unprecedented scale. As the First Order's headquarters, the starship acted both as a command center and a battleship.