Eldritch Gambit (3.5e Invocation)
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Once per round as an interrupt action even when it isn't your turn, you can use this invocation to attempt to counter a spell as if you were using greater dispel magic, except there is no maximum limit on the dispel check. In addition, you gain a bonus to the dispel check equal to your Charisma modifier.
Unfortunately, this gambit takes a toll. You take 1 point of Constitution damage each time you use this ability.