You can react quickly to counter spells cast by opponents.
Prerequisite: Improved Counterspell, Improved Initiative.
Benefit: Once per round, you can counterspell an opponent's spell even if you have not readied an action to do so. This counterspell action takes the place of your next turn. You can't use this feat when you are flat-footed.
Normal: Without this feat, you must ready an action each round that you wish to use a counterspell.