Caustic Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise, the spell fails. On a hit, the target suffers the weapon attack’s normal effects, except that any damage dealt by the attack is acid damage instead of its normal type. If you miss by 3 or less, acid splashes on the target, and you instead deal 1d8 acid damage. This spell’s damage increases when you reach certain levels.

At 5th level, the melee attack deals an additional 1d8 acid damage to the target on a hit, and the acid damage dealt on a miss increases to 2d8. Both damage rolls increase by one die at 11th level (2d8 and 3d8) and 17th level (3d8 and 4d8).