In the Manga, the key is depicted to be an ordinary silver key with the crest of the Southern Cross, a simple cross, 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 cross with the crest, colored in green, at the center on top of a white diamond-shaped center. The blade of the key is of simple design, shaped like a cross.
While in possession of the key, a Celestial Spirit Mage may be able to summon the Southern Cross Crux, a Celestial Spirit with a cross for a head who is capable to know all information concerning Celestial Spirits and their Mages.
- ↑ Fairy Tail Manga: Chapter 4, Page 7
- ↑ Fairy Tail Anime: Episode 2
- ↑ Fairy Tail Manga: Chapter 72, Page 11