Editing Ogre:CharacterCodex:Combat:Maneuver (section)

===Pain===
Your opponent is in terrible pain and received a -1 pain penalty for every action he takes. 

Pain penalties are not cumulative. An opponent suffers only the worse pain effect and totally ignores other pain effects. Pain penalties are cumulative only if they are done in the same strike, i.e. : with two a total success, you could inflict a -2 pain penalty. 

You can only give pain to living creatures with discernible anatomies-undead, constructs, oozes, plants, and incorporeal creatures lack vital areas to attack.