The Break-Mirror Spell

Color of the day:  Blue
Incense of the day:  Rue
Set a small round mirror on the floor. Stand over it, holding a large rock. Do not stand so that you can see your image in the mirror, but look at the mirror's face and visualize your enemy, bad habit, problem, or obstacle. Then drop the rock and watch the glass and your problem shatter into a million pieces.
Thus the spell is fixed.

From Scott Cunningham's Book of Shadows
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Link to this spell: http://www.llewellyn.com/spell.php?spell_id=5411