Follow this link to get there
An Athamen is a traditional tool for disciples of the Wicca religion. It is normally a double-edged dagger, not necessarily sharpened, for it is seen more of an "antenna" to transport magical forces.
Now I am not a Wiccan, lacking the correct gender;-) and while I can relate to the aspect of natural philosophy, I cannot quite relate to other aspects of the cult. But as I know there are many people out there seeking counsil and spiritual fulfillment-and you need all kinds of people to make a world;-)-I respect anyone who does even try to obstain from doing harm to the world and fellow humans.
But I simply admire the skill shown in that video.
Enjoy!