Thorn Castle
Druid Attack 3
You cause thorny vines to weave around your foes, tearing into them and forming a defensive barrier.
Area burst 1 within 10 squares
Target: Each creature in burst
Attack: Wisdom vs. Fortitude
Effect: The burst creates a thorny zone that lasts until the end of your next turn. The zone grants cover to creatures within it and creatures attacked through it. Any creature that enters the zone takes 5 damage.
Thorn Castle is a 3rd level Druid encounter power. Creates a zone that covers allies and damages enemies. [PrP:41]