Acid Storm(Spell Compendium, p. 7)
Conjuration (Creation) [Acid]
Level: Sorcerer 6, Wizard 6,
Components: V, S, M,
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Area: Cylinder (20-ft. radius, 20 ft. high)
Saving Throw: Reflex half
Spell Resistance: No
Acid rain deals 1d6 points of acid damage per caster level (maximum 15d6) to each creature in the area.
Material Component: A flask of acid (10 gp).