These twin djinn were born of the cosmological star force. They aren't dueling djinn, but the powers of each balances out the powers of the other. This is because one was created with light star magic. The other one was create with dark star magic. As such, they each control their own forces of white and black magic. You will be given the knowledge of both, with the ability to cast all spells of each kind. Thus, this piece is really of a dual magic, but we would recommend using the black magic for the knowledge an actually casting the white magic. It works out better in the long run.