Ground Breaker

Ground Breaker (Ex): You can attack the floor around you as a full-round action. This attack automatically hits and deals damage normally. If you deal more damage than the floor's hardness, the space you occupy and all squares adjacent to you become difficult terrain. Creatures in those squares, except you, must succeed at DC 15 Reflex saves or be knocked prone. You must be at least 6th level to select this rage power.

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