Conjuration (Creation) [Cold]
Level: Druid 3, Sorcerer 3, Wizard 3
Components: V, S
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Effect: Fog spreads in a 30-ft. radius, 20 ft. high
Duration: 10 minutes/level
Saving Throw: Fortitude half
Spell Resistance: No
A bank of fog composed entirely of tiny, razor-sharp ice shards billows out from the targeted point. The fog obscures all sight, including darkvi sion, beyond 5 feet. A creature 5 feet away has concealment (20% miss chance). Creatures farther away have total concealment (50% miss chance, and the attacker can’t use sight to locate the target).
In addition, the sharp ice particles tear the skin of those moving through the area, causing 4 points of damage per round, half of which is cold damage.
A strong wind (21+ mph) disperses the fog in 4 rounds; a severe wind (31+ mph) disperses the fog in 1 round. Dispersing the fog in this manner, however, causes damage to those within its area as the icy shards whip past. A strong wind causes 4 points of damage per round (half cold); a severe wind causes 8 points of damage (half cold).
Source: Frostburn, page 88.