The world of faerie is far more potent than the corporeal world. Simply bringing some of this world into our own can have violent results. This is well-understood by the elves, although rarely used with malicious intent; doing so is no easy task, and is a very ill-regarded use of their strength. Those able to do so are roughly titled as ‘sorceresses’ by other races; and certainly are capable of acting the part. More on the official site.