Aeternum

"'Welcome to the Aeternum, the both the flagship of our navy and my personal ship, along with your SSDs, it will be one of out most powerful command ships.'""― Emperor Garand Artross to Empress Ira after the formation of the Imperial Duality."

The Aeternum was an Aeternum-Class Star Dreadnought used by Emperor Darth Eternatus of the Eternal Sith Empire and later Imperial Duality. The Aeternum was the only ship of it's kind, a ship dedicated entirely to overwhelming firepower and destruction, as opposed to ships like the Executor-Class Star Dreadnought used by the Galactic Empire.