Thorn-covered vines sprout up from the ground around the enemy you strike.

At-Will   ✦     Poison, Primal, Weapon, Zone
Standard Action      Ranged weapon

Target: One creature

Attack: Wisdom vs. AC

Hit: 1[W] + Wisdom modifier damage. The attack creates a zone in a burst 1 centered on the target. The zone lasts until the start of your next turn. Any creature that ends its turn within the zone takes poison damage equal to your Wisdom modifier.
    Level 21: 2[W] + Wisdom modifier damage.

Published in Player's Handbook 3, page(s) 118.