Adran's Electric Wave

You call forth a wave of lightning which arcs out from you towards each creature in range

An affected creature, it must make a Dexterity saving throw. On a failed save, the creature takes 3d4 lightning damage. On a successful save, the creature takes half as much damage.This save is repeated by each creature in range of the caster on their subsequent turns

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the range increases by 5 feet for each slot level above 3rd.