Acid Fog

Acid fog creates a billowing mass of highly acidic, misty vapors that slow down creatures. Creatures moving through acid fog move at half their normal speed and take a –2 penalty on all melee attack and melee damage rolls. The vapors prevent effective ranged weapon attacks, granting all creatures inside the fog a +8 bonus to AC against normal ranged attacks. Each round on your turn, starting when you cast the spell, the fog deals 2d6 points of acid damage to each creature and object within it.