Caustic Smite

You weapon drips with acidity. The next time you hit with a melee or ranged weapon attack during this spell’s duration, the caustic venom seeps into the target as they take an extra 3d4 acid damage. The target must succeed a Dexterity saving throw or take an additional 1d4 acid damage at the start of their next turn.

At Higher Levels: When cast using a spell slot of 2 level or higher the damage increases by 2d4 acid damage and the additional damage taken at the start of the targets turn increases by 1d4 acid damage, for each slot above 1st