Flying Processing Unit

It is said that there is an energetic core in Skyland's soil and it is under its power that Skyland floats in the air.

Long ago the ancestors of Skytopia discovered a special energy from the clouds that could make objects float in the air, and they invented a device to extract and store this energy: the Flying Processing Unit. Its appearance immediately triggered Skytopia's 'industrial revolution' and the ability to fly emerged. Due to the complexity of the fabrication process of the Flying Processing Unit and its wide range of applications, it gradually became the circulating currency in Skytopia.