Nostluhk Leviathan

The Nostluhk Leviathan was the principal starship of the Nostluhk Dominion during its peak.
It was one of the largest starships every created and inspired awe and terror in equal measure. There are no known records of it ever being defeated in battle.
The size of the Leviathan was such that it could be battling a fleet at the front and the battle could be over by the time the rear of the ship arrived. The hull was as thick as an Alexander-MkII Class Starship.
By 328AE Nostluhk Leviathan's were largely wrecks, as the decimation of the Nostluhk made it impossible for them to man and maintain them as they did not trust their slaves the Orabavair or Trict with the secrets of their constuction or technology. A few remained in working order and they were feared by every major power in the galaxy.
The wreck nicknamed 'Pluto' was a Nostluhk Leviathan.