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You can use dispel magic to end one ongoing spell that has been cast on a Creature or object, to temporarily suppress the magical abilities of a magic item, or to counter another spellcaster's spell. A dispelled spell ends as if its Duration had expired. Some Spells, as detailed in their descriptions, can't be defeated by dispel magic. Dispel magic can dispel (but not counter) spell-like effects just as it does Spells. The effect of a spell with an instantaneous Duration can't be dispelled, because the magical effect is already over before the dispel magic can take effect.
You choose to use dispel magic in one of two ways: a targeted dispel or a counterspell.
Targeted Dispel: One object, Creature, or spell is the target of the dispel magic spell. You make one dispel check (1d20 + your caster level) and compare that to the spell with highest Caster Level (DC = 11 + the spell's caster level). If successful, that spell ends. If not, compare the same result to the spell with the next highest Caster Level. Repeat this process until you have dispelled one spell affecting the target, or you have failed to dispel every spell.
For example, a 7th-level caster casts dispel magic, targeting a Creature affected by Stoneskin (caster level 12th) and fly (caster level 6th). The Caster Level check results in a 19. This check is not high enough to end the Stoneskin (which would have required a 23 or higher), but it is high enough to end the fly (which only required a 17). Had the dispel check resulted in a 23 or higher, the Stoneskin would have been dispelled, leaving the fly intact. Had the dispel check been a 16 or less, no Spells would have been affected.
You can also use a targeted dispel to specifically end one spell affecting the target or one spell affecting an area (such as a Wall of Fire). You must name the specific spell effect to be targeted in this way. If your Caster Level check is equal to or higher than the DC of that spell, it ends. No other Spells or effects on the target are dispelled if your check is not high enough to end the targeted effect.
If you target an object or Creature that is the effect of an ongoing spell (such as a Monster summoned by Summon Monster), you make a dispel check to end the spell that conjured the object or Creature.
If the object that you target is a magic item, you make a dispel check against the item's Caster Level (DC = 11 + the item's caster level). If you succeed, all the item's magical properties are suppressed for 1d4 rounds, after which the item recovers its magical properties. A suppressed item becomes nonmagical for the Duration of the effect. An interdimensional opening (such as a bag of holding) is temporarily closed. A magic item's physical properties are unchanged: A suppressed magic sword is still a sword (a masterwork sword, in fact). Artifacts and deities are unaffected by mortal magic such as this.
You automatically succeed on your dispel check against any spell that you cast yourself.
Counterspell: When dispel magic is used in this way, the spell targets a spellcaster and is cast as a counterspell. Unlike a true counterspell, however, dispel magic may not work; you must make a dispel check to counter the other spellcaster's spell.