Triarii

"'The Empires Wrath is here. The Indestructable, the impenetrable. The Triarii!' - General Rackton."The Triarii was a advanced, modified Juggernaut Class Star Destroyer. It was the personal command ship of the Emperor of the The Syth Empire and acted as his flagship when he decided not to use Citadel Station. It had the Empires most advanced weaponry just like Citadel Station, as well as a unique superweapon attached to its hull known as The Executioner.