vitriolage

You shoot a ball of acidic slime towards a target. Upon a successful attack against that target, you deal 1d6 acid damage and force the target to make a dexterity saving throw against your spell save DC or take an additional 1d6 acid damage for up to 1/4th your level in rounds.

The affected target may use a single move action to remove the acidic slime before the end of duration.

the secondary acid damage of this spell increases by 1d6 per 5 levels