Restriction: This ability can be applied only to heavy armor.
When the wearer of a suit of rampaging armor charges or attempts a bull rush combat maneuver check, he can ignore difficult terrain. Once per day as a swift action, when the wearer of a suit of rampaging armor charges or performs a bull rush combat maneuver, he can turn each square he moves through into difficult terrain as he demolishes everything in his path. This change of terrain remains for 1 minute.
Pathfinder Player Companion: Armor Master’s Handbook © 2016, Paizo Inc.; Authors: Alexander Augunas, Robert Brookes, Anthony Li, Luis Loza, and David Schwartz.