You can root yourself into place to avoid being tripped or pushed.
Prerequisite(s): Mandragora.
BENEFIT
As a move-equivalent action that does not provoke an attack of opportunity, you can root yourself in place. While rooted, you receive a +5 circumstance bonus to your Combat Maneuver Defense when resisting a bull rush or trip attempt. If you move or are moved from the square in which you initiated this ability, the bonus ends.