Airship

Airships are flying vehicles in the world, mainly used for military purposes. However, they have been used in other services (transportation, research, smuggling etc.). They are normally powered by steam engines, fueled with some type of gem/coal mix.

Types:
 * Civilian Airships - used by normal civilians.
 * Military Airships - used by official armies.
 * Pirate Airships - used by pirates.