Death Fog

The casting of a death fog spell creates an area of Solid Fog that has the additional property of being highly acidic. The vapors are deadly to living things, so that vegetation to them will die — grass and similar small plants in two rounds, bushes and shrubs in four, small trees in eight, and large trees in 16 rounds. Animal life not immune to acid suffers damage according to the length of time it is exposed to the vapors of a death fog, as follows:

1st round: 1 point

2nd round: 2 points

3rd round: 4 points

4th and each succeeding round: 8 points

The death fog otherwise resembles the 2nd-level Fog Cloud: rolling, billowing vapors that can be moved only by a very strong wind. Any creature attempting to move through the death fog progresses at a rate of but one foot per unit of normal movement rate per round. A Gust of Wind spell cannot affect it. A Fireball, Flame Strike, or a Wall of Fire can burn it away in a single round.

The strong acid (including highly distilled vinegar or acid crystals) must be obtained from an alchemist.

[Player's Handbook]

School: Alteration, Evocation
Level: 6
Rarity: Common

Range: 30 yards
Components: V, S, M
Duration: 1d4 rounds + 1/level
Casting Time: 6
Area of Effect: Two 10-foot cubes/level
Saving Throw: None

Material Components: a pinch of dried and powdered peas, powdered animal hoof, and strong acid of any sort (including highly distilled vinegar or acid crystals)