The reactor core of the Death Star II.A reactor, also known as a main reactor or reactor core, was a central power-generation device used in space stations and other spacefaring vehicles. The most widespread reactor types were chemical, fission, and nuclear fusion reactors, whose history extended back to the Republic's earliest days. These reactors often depended on various locally procured fuel sources, while larger starships frequently employed hypermatter annihilation reactors that produced enormous amounts of power. Even so, most fuel sources were hazardous to organic beings, circulating through ship systems as corrosive liquids or as combustible and poisonousgases.Both the Death Star and the DS-2 Death Star II Mobile Battle Station, planet-destroying space stations constructed by the Galactic Empire, possessed reactor cores that would explode and destroy the station if struck by sufficiently powerful weapons.The axial superlaser mounted on Xyston-class Star Destroyers likewise had the power to disintegrate planets. Harnessing such immense power required a direct connection to the Star Destroyer's solar ionization reactor. Consequently, severe damage to the superlaser would trigger a chain reaction, overwhelming its host ship's reactor core and resulting in the destruction of the warship.