This piece is very simple. All you have to do is wear the piece and allow your energies to flow through it. This will awaken a fairy named Fern. She is a Nordic fairy and she practices the ancient magic of the Vikings. This is dual magic, so technically Fern is a dual magic fairy. Either way, she will awaken when you wear this piece. She will live inside of your home. At first she will be invisible to your eye, but the more you wear your piece and the more she gets familiar with your energy she will become more active. You'll catch her out of the corner of your eye, maybe you'll catch her reflection in the mirror, things like that. She will eventually make full contact with you, so just be ready for it.
Fern will grant the white light spells that you ask of her. All you have to do in order for her to know what you want granted is think it in your mind. Leave the rest up to her.