Melf's Acid Arrow

By means of this spell, the wizard creates a magical arrow that speeds to its target as if fired from the bow of a fighter of the same level as the wizard. No modifiers for range, non-proficiency, or specialization are used. The arrow has no attack or damage bonus, but it inflicts 2d4 points of acid damage, with saving throws for items on the target, There is no splash damage. For every three levels that the caster has achieved, the acid lasts for another round, unless somehow neutralized, inflicting another 2d4 points of damage each round. So at 3rd-5th level, the acid lasts two rounds, at 6th-8th level, the acid lasts for three rounds. etc.

School: Conjuration/Summoning
Level: 2
Rarity: Uncommon

Range: 150 yards
Components: V, S, M
Duration: Special
Casting Time: 2
Area of Effect: 1 target
Saving Throw: Special

Material Components:
a dart, powdered rhubarb leaf, and an adders stomach