Conjuration (Creation)
Level: Sor/Wiz 4
Components: V, S, M
Duration: 1 min./level
Spell Resistance: No
This spell functions like fog cloud, but in addition to obscuring sight, the solid fog is so thick that any creature attempting to move through it progresses at a speed of 5 feet, regardless of its normal speed, and it takes a –2 penalty on all melee attack and melee damage rolls. The vapors prevent effective ranged weapon attacks (except for magic rays and the like). A creature or object that falls into solid fog is slowed, so that each 10 feet of vapor that it passes through reduces falling damage by 1d6. A creature can’t take a 5-foot step while in solid fog.
However, unlike normal fog, only a severe wind (31+ mph) disperses these vapors, and it does so in 1 round.
Solid fog can be made permanent with a permanency spell. A permanent solid fog dispersed by wind reforms in 10 minutes.
Material Components: A pinch of dried, powdered peas combined with powdered animal hoof.
Source: Player's Handbook
Fog Cloud
Conjuration (Creation)
Level: Drd 2, Sor/Wiz 2, Water 2
Components: V, S
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft. level)
Effect: Fog spreads in 20-ft. radius, 20 ft. high
Duration: 10 min./level
Saving Throw: None
Spell Resistance: No
A bank of fog billows out from the point you designate. The fog obscures all sight, including darkvision, beyond 5 feet. A creature within 5 feet has concealment (attacks have a 20% miss chance). Creatures farther away have total concealment (50% miss chance, and the attacker can’t use sight to locate the target).
A moderate wind (11+ mph) disperses the fog in 4 rounds; a strong wind (21+ mph) disperses the fog in 1 round.
The spell does not function underwater.
Source: Player's Handbook