The Mega-class Star Dreadnought, also known as the Mega-class Star Destroyer, the Mega Star Destroyer, or the First Order Mega-Destroyer, was a class of Star Dreadnought utilized by the First Order during their conflict with the Resistance.
The sole Mega-class Star Dreadnought in the First Order Navy was the Supremacy, the flagship of Supreme LeaderSnoke as well as the de factocapital of the First Order. The Supremacy suffered extensive damage while attacking the Resistance fleet when Vice AdmiralAmilyn Holdorammed it near lightspeed with the heavy cruiser Raddus, slicing the Dreadnought in two and also destroying a number of its escort Resurgent-class Star Destroyers.
Koros-Strohna, known as worldships in Galactic Basic Standard, were immensely large, organically created spacefaring vessels that housed entire communities of the extra-galactic Yuuzhan Vong, providing them with food and shelter. They also served as a staging ground for long battles.
Like all other Yuuzhan Vong vehicles and vessels, the Koros-Strohna, or worldship, was made of Yorik coral. The Yorik coral also formed symbiotic relationships with countless other organic materials to provide weapons, propulsion systems and defensive capabilities. Maw luur served as a recycling system as well as provided valuable life support to the vessel. A worldship had more in common with a planet than a starship and, like most other Yuuzhan Vong bio-engineered vessels, it did not appear to be a starship at all.
Its main body was a disc-shaped bulk littered with hundreds of weapon projections and other protrusions. On the edges of the worldship were several large spiral arms, causing the ship to resemble a galaxy. In areas where the gravitational pull was weak, including the region between galaxies, the Koros-Strohna extended membranous tendrils called outrider ganglia. Each tendril was anchored by hundreds of Coralskippers, which helped unfold the membrane. Once unfurled, the ganglia served as cosmic sails.