Conjuration(Creation)
Level: Sorcerer 1, Wizard 1
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One orb of sonic energy
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
This spell functions like lesser orb of acid, except that it deals 1d6 points of sonic damage, plus an additional 1d6 points of damage per two caster levels beyond 1st: 2d6 at 3rd level, 3d6 at 5th level, 4d6 at 7th level, and the maximum of 5d6 at 9th level or higher.
Source: Spell Compendium (Page 151)