For the SR version of the spell, see Melf's Acid Arrow.
Melf’s Acid Arrow
(Conjuration/Summoning)
Level: 2
Range: 60 ft.
Duration: 1 round/3 levels
Casting Time: 2
Area of Effect: 1 creature
Saving Throw: None
By means of this spell, the wizard creates a magical arrow that speeds to its target unerringly. The arrow has no attack or damage bonus, but inflicts 2d4 points of acid damage (there is no splash damage). For every 3 levels of the caster, the acid lasts for another round, unless somehow dispelled, inflicting another 2d4 points of damage each round. So at 3rd-5th level, the acid lasts 2 rounds, at 6th-8th level, the acid lasts for 3 rounds, and so on.