Poison Sting
Druid Attack 7
The insects of your swarm form gain poisonous stingers and use them against creatures all around.
Close burst 2
Target: Each creature in burst
Attack: Wisdom vs. Fortitude
Hit: 1d10 + Wisdom modifier poison damage. The next time the target moves before the start of your next turn, it takes 1d10 poison damage.
Primal Swarm: Add your Constitution modifier to the poison damage the target takes when it moves.
Poison Sting is a 7th level Druid encounter power. On a hit it poisons the target. [PrP:43]