Improved Bull Rush (Combat)Modifier
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.
Essentia: The bonus increase by another +1 / Essentia
[Greater Bull Rush] at 3 essentia you also gain : Whenever you bull rush an opponent, his movement provokes attacks of opportunity from all of your allies (but not you))
Normal: You provoke an attack of opportunity when performing a bull rush combat maneuver.