Devouring Flies
Druid Attack 15
You conjure a horde of ravenous horseflies, which bite your foes and transfer vitality to you.
Area burst 2 within 10 squares
Target: Each creature in burst
Attack: Wisdom vs. Fortitude
Hit: 2d6 + Wisdom modifier damage.
Miss: Half damage.
Effect: The burst creates a zone of horseflies that lasts until the end of the encounter. When any enemy starts its turn within the zone, you or an ally of your choice within 5 squares of you regains 6 hit points.
Devouring Flies is a 15th level Druid daily power. It hits an enemy and creates a zone that gives hit points to allies. [PrP:46]