Cone of Lightning

A blast of Lightning erupts from your hands. Each creature in a 60-foot cone must make a Dexterity saving throw. A creature takes 8d10 Lightning damage on a failed save, or half as much damage on a successful one.

A creature killed by this spell becomes a a pile of ash.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d10 for each slot level above 7th.