Blade of Banishing (Magic Dagger)

This dagger twists any magical barriers, protections, and illusions that it touches. Whenever it grazes a being or an area under an illusion, protective magic, or magical barrier, there is a percentage chance that the dagger will destroy the magic. The weapon has a base 60% chance of success, plus a random bonus of 1d20%, minus 10% per level of the magic contacted (a shield spell is a 1st-level spell and gives a modifier of -10%). Percentile dice are rolled. If the roll is less than or equal to the modified chance of success, the dagger destroys the magic. If the roll is higher than the modified chance of success, the dagger has no effect (note that spells of 8th level or greater can never be affected).
Consider all magical item effects to have the level of the item's creator, if known; otherwise, use one level greater than the level of any equivalent spell. The DM may choose to consider all unknown defensive magic to be 7th or 8th level, and all artifacts to be 12th level or greater. To act, the dagger need not be drawn or wielded. Its destructive nature is constant, regardless of the caster's wishes, and need not be activated or invoked. If thrown or thrust through a barrier that it does not bring down, the blade (and wielder, if in contact with it) suffers the magic's full normal effects. If the blade destroys the barrier, no damage is done to the wielder. 
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Daggers
Category:Magic Weapons