[She chuckles some before giving a shrug.]

You would have to ask a witch, sorcerer, or fairy about that, and I'm neither. Even if you manage to find one to ask, chances are they still won't tell you because they're a secretive bunch.

All I know is the stronger the magic, the better it works and the longer it lasts. Also that stronger magic take the wording of a spell more literally. Other than that, I have no clue on how it works. Most of the time I don't care anyway, just so long as it does work.