Acid Fog (TOToM Spell)

An improvement on other fog spells, this also laces it with acid, burning everything inside it.

A bank of green, acidic and very thick fog spreads from the point the caster indicates. All vision, including darkvision, is blocked beyond 5ft through the fog. A creature that's in the fog has concealment against anything within 5ft of it, and total concealment against anything further away than that.

Additionally, the speed of any creature inside the fog has all of its speeds reduced to 5ft, and cannot make 5ft steps. They also take a -2 penalty on all melee attack and damage rolls. Ranged weapon attacks through such a fog are ineffective and automatically miss.

Lastly, the acidic vapours deal 2d6 damage to any creature or object inside it, at the beginning of the caster's turn.

Anything that falls into such a fog is slowed, reducing falling damage by 1d6 for each 10ft of fog it falls through.

A severe wind (31+ mph) gives a -6 penalty to this spell's dissipation roll.

This spell does not allow spell resistance.

Enhanced: The fog deals 2d8 damage, and a severe wind only gives a -3 penalty to this spell's dissipation roll.

Diminished: The fog deals 2d4 damage, and a severe wind gives a -9 penalty to this spell's dissipation roll.

Immune: The fog deals no damage.

Augment (+2 levels): The duration of this spell becomes Permanent. A severe wind breaks up such a fog in 1 round, but the fog reforms 1 round later.