Your attack causes the ground to rise up, holding the target fast.

Encounter   ✦     Primal, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 3[W] + Strength modifier damage, and the target is immobilized until the end of your next turn.

  Earthstrength: The attack deals extra damage equal to your Constitution modifier.

Published in Primal Power, page(s) 101.