The next time you make a ranged weapon attack during the spell's duration, the weapon's ammunition (or the weapon itself if it's a thrown weapon) transforms into a bolt of lightning. You make a ranged attack with the weapon as normal. This attack ignores partial and three-quarters cover and the attack does not suffer disadvantage for being made at long range. On a hit, the target takes 4d12 lightning damage instead of the weapon's normal damage.

Whether you hit or miss, each creature in a direct line between you and the target succeed on a Dexterity saving throw or take 2d12 lightning damage. The piece of ammunition 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 1d12 for each slot level above 3rd.