Arc lightning

You chose a creature within range and cause lightning to arc to them and other creatures around them. Make a ranged spell attack against them on a hit they take 2d4 lightning damage and the caster can chose a number of creatures equal to their spellcasting ability modifier within 30 ft of the target, They all must make a dexterity saving throw or take 1d4 lightning damage on a failed save or half as much on a successful save. This spells damage increases by 1d4 for each spell level above first.