Horologium  

The Clock, ホロロギウム

Lucy Heartfilia owns a Celestial Spirit named Horologium, which she uses for various purposes. In non-combat situations, it serves as a safe haven and a means of transportation. During combat, it can protect the person inside with its hard wooden body, but does not have any combative moves. Additionally, Horologium is only available for a limited time outside the Spirit World and will return there once the time expires, leaving the occupant behind regardless of any danger they may be in.