
It doesn’t have any real special attributes, though it obviously still works as protection.

When Erza refused to help him, Jellal cast her out of the tower and told her to tell no one about it, and to never return. However, Jellal appeared to be possessed by Zeref, though he was really being controlled by a mage named Ultear, and decided that the only way to attain freedom was to complete the tower and revive Zeref.

After Jellal was captured trying to save Erza from being tortured by the slavers, Erza started a revolution in the tower, awakening her latent magic power to defeat the slavers and rescue her captured friend. While working on the Tower of Heaven, Erza, along with her friend Simon, befriended Jellal Fernandes, Shô, Wally Buchanan, and Millianna, a couple other slave children forced to work on the tower, with Jellal giving Erza her last name because of her red hair. They were brought out to sea and forced to build the Tower of Heaven, a structure designed to resurrect the ancient dark mage known as Zeref. At the age of ten, Erza, along with several other kids from her village, were abducted by slavers.
