The material below is designated as Open Game Content
First Strike (General)
You know how to seize advantage when it comes your way.
Prerequisites: Combat Reflexes, Dex 19+
Benefit: If someone provokes an attack of opportunity you strike slightly before they do. This means that your damage is inflicted before they take their action, and any penalties you inflict on them take place before their roll.
Normal: Damage is inflicted during the action of the target, so he can complete his action normally.