The magic in this piece has been imparted to this piece by a coven of Cantonese witches. They practice the old art of the Orient and their coven has since ancient times. Not all of the witches in this coven are immortal. Some of them are young, but this was made by one of the elder witches named Hua who was around long enough to have served the Han Dynasty.
The piece you are getting is a spell writer. You will use the piece to write down your spells, which will then be cast by the magic of the ancient Orient. This is extremely powerful magic that will shape and mold as you see fit. You want to cast it? All you have to do is write it!