Combat Expertise( General)
You are an expert at ﬁghting cautiously so as to minimise the risk of being hit.
Prerequisite: Int 13.
Beneﬁt: When you use the attack action or full attack action in melee, you can take a penalty of as much as –5 on your attack and add the same number (up to +5) to your Defence. This number may not exceed your baseattack bonus. The changes to attack rolls and Defence last until your next action.
Special: If you use combat expertise while ﬁghting defensively, the bonuses are cumulative.