As you hit with a brutal attack, a wave of primal energy ripples through the ground around the target.

Encounter   ✦     Primal, Weapon, Zone
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 1[W] + Strength modifier damage, and the squares adjacent to the target become a zone of shifting ground until the end of your next turn. Any enemy marked by you that enters the zone is knocked prone.

Published in Primal Power, page(s) 95.