The earth rises up like the maw of a hungry dragon to clamp around your foe and hold it in place.

Encounter   ✦     Arcane, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Charisma vs. Reflex

Hit: 3d6 + Charisma modifier damage, and the target is immobilized until the end of your next turn. While the target is immobilized by this power, you and your allies can move through the target's space and don't provoke opportunity attacks from it by leaving a square adjacent to it.

Published in Player's Handbook 2, page(s) 143.