Inaccurate?

Magic Disruption

( Complete Mage, p. 44)

[Reserve]

You can use your powers of abjuration to interfere with other casters' spells.

Prerequisite

Ability to cast 3rd-level spells,

Benefit

As long as you have an abjuration spell of 3rd level or higher available to cast, you can attempt to interrupt another character's spellcasting with a tiny burst of magic. As an immediate action, you can force any character within 30 feet currently casting a spell to make a Concentration check (DC 15 + the level of the highest-level abjuration spell you have available to cast); if the check fails, the spell's save DC and caster level are reduced by 2 (to a minimum caster level of 1st). As a secondary benefit, you gain a +1 competence bonus to your caster level when casting abjuration spells.

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