Melf's Acid Arrow(Player's Handbook v.3.5, p. 253)
Conjuration (Creation) [Acid]
Level: Sorcerer 2, Wizard 2, Warmage 2, Duskblade 2, Sha'ir 2, Savant 2 (Arcane), Gnome Artificer 2, Slime 2,
Components: V, S, M, AF,
Casting Time: 1 standard action
Range: Long (400 ft. + 40 ft./level)
Effect: One arrow of acid
Duration: 1 round + 1 round per three levels
Saving Throw: None
Spell Resistance: No
A magical arrow of acid springs from your hand and speeds to its target. You must succeed on a ranged touch attack to hit your target. The arrow deals 2d4 points of acid damage with no splash damage. For every three caster levels (to a maximum of 18th), the acid, unless somehow neutralized, lasts for another round, dealing another 2d4 points of damage in that round.
Material Component: Powdered rhubarb leaf and an adder's stomach.
Focus: A dart.