Breath of the Jungle

(Spell Compendium, page 39, DnD 3.5)

Transmutation

Level: ; Druid 1
Components: V, S
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./ level)
Effect: Mist spreads in a 40-ft. radius, 20 ft. high
Duration: 1 minute/level
Saving Throw: None
Spell Resistance: No

With a word of power and flick of your wrist, a foul-smelling, fine mist appears.

The DC of any saving throw made within the mist against poison or disease increases by 2.

The mist does not provide concealment.