Scouring Winds

Evocation [air, earth]
Level: Druid * 7, Sorcerer */Wizard * 7, Warlock * 7
Components: V, S
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Effect: sandstorm in 20-ft. radius, 20 ft. high
Duration: 1 round/level (D)
Saving Throw: None
Spell Resistance: yes, see text
  This spell brings forth a windstorm of stinging sand that blocks all vision. You can move the storm up to 30 feet each round as a Move Action. Any creature in the area takes 3d6 points of piercing damage each round. The area is considered a windstorm (see Table 13-10: Wind Effects, Core Rulebook 439). If a creature with spell resistance successfully resists this spell, it is unaffected by the winds and sand, but still unable to see within the area of the spell.