Eclipse-class
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The Eclipse-class star dreadnought are an extremely large warship, of which only two were ever made. Both were constructed to serve Darth Sidious's personal flagship. They're 17 kilometers long, a bit shorter super-star destroyers, but were much wider. considering the initial statements about the size of the super-star destroyers, it's fairly obvious the Eclipse ships were meant to dwarf them.
Eclipses were among the most powerful warships to appear in Star Wars. They had enough firepower to engage entire Rebel fleets at a time, and their armor and shields were so strong they wouldn't need to think twice before ramming other ships (one these rammed through the Galaxy Gun without taking any damage). In addition to their standard weapons and huge number of fighters, they also possessed gravity well projectors to keep enemies from escaping inter hyperspace. The crown jewel of their features, however, was their own super-laser. Though not in the same league as the super-lasers possessed by the Death Star, they were still powerful sear of continents and/or crack open a planet's crust and/or burn of a continent. The result of the energy for the latter is well above the minimal energy requirements for a planetary extinction, so even though it wouldn't destroy a planet, it will likely kill everything on it.