Acid Arrow
Spell 2AcidAttackEvocationSource Core Rulebook pg. 316 2.0Traditions arcane,
primalCast 
somatic,
verbalRange 120 feet;
Targets 1 creature
You conjure an arrow of acid that continues corroding the target after it hits. Make a spell attack against the target. On a hit, you deal 3d8 acid damage plus 1d6 persistent acid damage. On a critical hit, double the initial damage, but not the persistent damage.
Heightened (+2) The initial damage increases by 2d8, and the persistent acid damage increases by 1d6.