Callon’s Cackling Cutlass

You brandish the weapon used in this spell’s casting and imbue it with crackling lightning to make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal damage plus an additional 4d8 lightning damage as the electricity surges through. In addition, all other creatures in a line 30 feet long and 5 feet wide behind the original target must make a DEX save or also take 4d8 lightning damage, or half as much on a successful save.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, both lightning damages increase by 1d8. When you cast this spell using a 5th level or higher spell slot and have access to the Extra Attack feature, you can reduce the damage of both instances by 2d8 to instead cast this spell as part of an attack action, with this spell instead replacing one of your attacks from the Extra Attack feature. If cast using a 9th level spell slot and you have access to the Extra Attack feature, you can reduce both instances of damage by 4d8 to cast this spell a number of times equal to the number of the attacks you would be able to take with an attack action