Aura of Lightning

Lightning washes out from you and coalesces in a soft radiance in a 10-foot radius around you. Creatures in that radius when you cast this spell must make a Dexterity Saving Throw. On failed save take 5d8 lightning damage, or half as much damage on a successful save. In addition, when a creature ends its turn in the aura, it takes an additional 4d8 lightning damage.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the range of the aura increases by 5 feet.