In the Manga, the key is depicted to be an ordinary silver key with the crest of the Clock, a simple clock with two hands with the shorter one pointing to the right and the longer one pointing upward, stamped on its bow. In the Anime, the key is still depicted as silver but is designed more intricately. The bow is designed similar to a cuckoo clock with the crest in the middle, colored brown. The blade of the key is of simple design, similar to other silver keys.
While in possession of the key, a Celestial Spirit Mage may be able to summon the Clock Horologium by reciting the quote, "Open Gate of the Clock! Horologium!". This summons Horologium, a walking grandfather's clock that is able to shield people inside its body.
- ↑ Fairy Tail Manga: Chapter 4, Page 7
- ↑ Fairy Tail Anime: Episode 2
- ↑ Fairy Tail Manga: Chapter 2, Page 39