The airship Grancypher, commissioned by the liege's residence of Moldavia was designed by the First Military Industrial Complex and assembled by the magical engineering department of the Nissia Winter Fort Academy. It was one of less than ten 'Emperor-class' aerial warship that was made across the entire Mycroft Continent—it was rumored that multiple Legendary champions had augmented the vessel itself, granting it energy source to almost never land.
In truth, that was not wrong. The core of the warship was certainly designed and calibrated by several Legends, since miniaturizing and simplifying the 'Nuclear Heart' for use as an ordinary warship engine was not something anyone could do—and the Grancypher, which spans thirteen hundred feet from bow to stern, carried two 'Nuclear Heart'-class of motivation core.
