Improved Studied Combatant

Deep understanding of your foes’ tics grants you the upper hand in combat.

Prerequisite: Int 13, Amateur Investigator†, Studied Combatant†, base attack bonus +8, 1 rank in at least one Knowledge skill, no levels in a class that has the inspiration† class feature.

Benefit: Your bonuses for Studied Combatant increase to a +4 insight bonus on melee attack rolls and a +4 bonus on damage rolls. This feat otherwise works like the Studied Combatant feat.

Source: Advanced Class Guide