That edit lol I was just about to fix that incorrect spelling of her name xD
The correct spelling is Cadance. I think those who say "Cadence" get it confused with her full name Mi Amore Cadenza where it is correctly spelled with an e in the same spot.. I have a habit of fixing every instance of "Cadence" that I see if I can post at the place it's posted in xDDark Pit.
I've seen it spelled both ways for her so I got a bit confused.
I am guessing a diamond-shaped weapon.