You can control your abilities more effectively in combat.
Benefit: Once per day, when fighting defensively as a standard or full-round action, you take a –3 penalty on all attack rolls in a round and gain a +3 dodge bonus to AC in the same round. When you attain 7th level, your penalty on attack rolls drops to —2 and your dodge bonus increases to +4. When you attain 15th level, your penalty on attack rolls drops to –1 and your dodge bonus increases to +5. This bonus stacks with the bonus to AC granted by the Combat Expertise feat. This benefit is an extraordinary ability.
Normal: When fighting defensively, you take a –4 penalty on all attacks in a round and gain a +2 dodge bonus to AC for the same round.
Special: You can select this feat multiple times, gaining one additional daily use each time you take it.
Special: If you have the ability to turn or rebuke undead, you gain one additional daily use of this feat for each daily turn or rebuke use you expend.
Source: Complete Champion, page 63.