Grass of Grabbing (4e Power)

Grass of Grabbing	Explorer Attack 1
You create a small area of grass. The grass grabs your enemies' feet and slashes them.
Encounter Primal, Implement, Zone
Standard Action	Area burst 1 within 10
Target: Each creature in burst
Attack: Wisdom Vs. Reflex
Hit: 1d8 + Wisdom modifier damage, and the target is immobilized until the end of your next turn.
Effect: The burst creates an area of grass that lasts until the end of your next turn. Each creature that begins it's turn or enters the zone takes damage equal to your Charisma modifier. The zone is also difficult terrain.
Natural Explorer: The zone stays a number of turns equal to your Charisma modifier.