Use this empty vial and fill up on some moonwell water here in Auberdine. Such potent magic should provide a clue as to the composition of the crystal. To do that, you'll pour the liquid over the crystal; it should take care of the rest.
While I don't anticipate anything bad happening to you, I still want you to be careful. Above us to the east is Felwood; if that crystal is tied to that place as I suspect it is, then it could prove to be very dangerous.
