Roots erupt from the ground and hold your ally in place.

Encounter   ✦     Primal
Immediate Interrupt      Ranged 10

Trigger: You or an ally within 10 squares of you is pulled, pushed, or slid

Target: The character affected by the forced movement

Effect: The target is unaffected by the forced movement.

Published in Player's Handbook 2, page(s) 90.