Bright green tendrils wrap around your foe and hold it fast.

Encounter   ✦     Primal, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 2[W] + Strength modifier damage, and the target is immobilized until the end of your next turn.

  Earthstrength: Until the end of your next turn, the target also takes a penalty to AC and Reflex equal to your Constitution modifier.

Published in Player's Handbook 2, page(s) 161.