New Feats

Defense Master
Prerequisites: BAB +4, Combat Expertise, Weapon Focus
Benefit: When using Combat Expertise or fighting defensively, and wielding a weapon in which you have weapon focus, you can score a critical defense using the weapon’s base crit range (effects such as keen do not affect defense).

Defensive Maneuver
Prerequisites: BAB +8, Defense Master
Benefit: Choose a single combat maneuver. When you score a critical defense while wielding a weapon with which you have weapon focus, you can attempt that maneuver against your attacker assuming they are within the normal range of that maneuver. You can take this feat more than once. Each time, you choose a new maneuver.

Riposte
Prerequisites: BAB +8, Defense Master
Benefit: When you score a critical defense while wielding a weapon with which you have weapon focus, you can make one melee attack as an immediate action against the target (if it is in range of your melee attack). Because you lack time to prepare, features such as vital strike or sneak attack cannot be applied, though any effect applied on or before your last turn that lasts a round or more (such as a spell or Power Attack) still applies.

New Feats

Mark of Vengeance Summerhawk