Melf's Acid Arrow

Caster Level: Cleric 2 (Magic Domain), Wizard/Sorcerer 2
Innate Level: 2
School: Conjuration
Components: V,S
Range: Long
Save: None
Spell Resistance: No
Area of Effect: Single
Duration: 1 round with an additional 1 round for every three caster levels
Additional Counterspells: None
Description: The caster fires a bolt of acid at the target, dealing 4 + 1/9 caster levels d6 acid damage always. Continuing damage if one isn't currently being applied is 4d6 acid per round (for caster level/3 rounds).