Ash Storm

Conjuration (Creation) [fire]
Level: Artificer * 3, Druid * 3, Hunter * 3, Sorcerer */Wizard * 3, Warlock * 3
Components: V, S, M/DF (a pinch of ash)
Casting Time: 1 Standard Action
Range: long (400 ft. + 40 ft./level)
Area: cylinder (40-ft. radius, 20 ft. high)
Duration: 1 round/level
Saving Throw: None
Spell Resistance: no
  Driving ash blocks all sight (even Darkvision) within the spell's area of effect, and Falling cinders cause the ground in the area to become Difficult Terrain.