Needs review
Source: Player's Handbook II

Description: Through intense mental exercise and training, you learn to enter a state of perfect martial clarity.

Prerequisites: WIS 13

Required for: Combat Awareness, Combat Defense, Combat Stability, Combat Vigor

In battle, you push aside the chaos of the fight and attain a focused state that grants you a keen, clear picture of the battle. Fear and pain ebb away as you focus solely on defeating your enemy. The first time you make a successful attack during an encounter, you gain your combat focus. In this state, your mind and body become one, allowing you to overcome mundane physical limits. You can maintain your combat focus for 10 rounds after entering it, +1 additional round per combat form feat you possess aside from this one. You can only gain your combat focus once per encounter. While you are maintaining your combat focus, you gain a +2 bonus on Will saves. If you have three or more combat form feats, this bonus increases to +4.