Grimoire Heart Airship

Grimoire Heart's Airship, as the name suggests, is a large airship that is used as the base for the Dark Guild, Grimoire Heart.

Localization
Grimoire Heart doesn't seem to have any stable localization. Its members live and travel on a giant airship that flies high above the land. Because of this, it is an elusive guild.

Magic & Abilities
Despite its large size, it is quite fast and maneuverable, as it was seen dodging a punch from a gigantic Makarov.

Devil's Heart
It also houses the Devil's Heart - a generator like machine that serves as both a power source for the Guild Master as well as life support.