PFSRD:Improved Bull Rush
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Improved Bull Rush (Combat)
You are skilled at pushing your foes around.
Benefit: You do not provoke an attack of opportunity when performing a bull rush combat maneuver. In addition, you receive a +2 bonus on checks made to bull rush a foe. You also receive a +2 bonus to your Combat Maneuver Defense whenever an opponent tries to bull rush you.
Normal: You provoke an attack of opportunity when performing a bull rush combat maneuver.