This mundane looking axe is appears at first to be the most useless magic item ever made. When a successful attack is made against a target, the player rolls no damage. The axe instead passes harmlessly through the target, as though the axe were an illusion. The only proof that the blow even landed is a puff of purple, foul-smelling smoke which lingers a moment after a successful blow.
The true value of the axe will become apparent only when it is used against a magic user. The axe severs the link between the magician’s corporeal body, and the metaphysical energies which she commands. As a result, a magic user who is struck with this weapon will be unable to cast spells. The MU will not be made immediately aware of this, and may attempt to cast a spell (or several) before realizing their powers have been somehow blocked.
The bond between the magician and the power of her craft heals quickly, however. The power to cast spells normally will return 1d10 minutes after the blow is struck. (This should be rolled instead of damage.)
The axe should still work against most creatures which use magic. Creatures which rely on magic to exist on this plane (such as demons, or ghosts) will instead be banished for 1d10 minutes.