D&D4 Wiki
Wall of smoke
druid attack 1

area wall 5 within 10 squares

Target: each creature within the wall

Attack: Wisdom vs. Fortitude

Hit: 1d10 + Wisdom modifier poison damage. The user can slide the target up to 1 square.

Effect: Until the end of the user's next turn, the squares within the wall are lightly obscured, and any creature that ends its turn within the wall takes poison damage equal to the user's Constitution or Dexterity modifier.

Wall of smoke is a 1st-level druid encounter attack power. Each hit target takes poison damage and is subject to a slide. Also, until the end of the user's next turn, the area becomes lightly obscured and deals Constitution or Dexterity based poison damage to creatures ending their turns within it.[HotF:78]