Board Thread:General Discussion/@comment-7242608-20140604015723/@comment-3146930-20140617045211

It is an insignia, it doesn't really have to do anything. As far as a weapon goes, I believe Cinder's dress is laced with Dust as certain parts of it glow when she uses it. But as I said, if it is just a tattoo then it doesn't have to do anything. The insignia also appears during the last few seconds of Episode 16, much like Roman's in the picture above.