As part of the action used to cast this spell, you must make a ranged attack with a weapon against one creature, otherwise the spell fails. When you make this ranged attack, the weapon's ammunition, or the weapon itself if it's a thrown weapon, transforms into a bustling acid bolt . Make the attack roll as normal. The target takes 4d4 acid damage on a hit, or halve as much damage on a miss, instead of the weapon's normal damage.
Whether you hit or miss, each creature within 10 feet of the target must make a Dexterity saving throw. If an initial target was hitted by this spell previously, it has disadvantage on this saving throw. Each of these creatures takes 4d4 acid damage on a failed save, or halve as much damage on a successfull one. In addition, each creature that failed its saving throw gain an -2 to AC until the start of the caster's next turn.
The piece of ammuntion or weapon then returns to its normal form.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage for both effects of the spell increases by 2d4 for each slot level above 3rd.
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