Cone Of Flames

A blast of roaring flames erupts from your hands. Each creature in a 90-foot cone must make a Dexterity saving throw. A creature takes 10d8 fire damage on a failed save, or half as much damage on a successful one.

A creature killed by this spell becomes a dust but it's items cannot be effected by this spell

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d8 for each slot level above 6th