Blast

A cone of explosive flames spews out from your hand. In a 20ft cone in front of the user any creature caught within it's reach must make a DC 16 DEX + half (round down if odd number) your spell save modifier or take 10d10 fire damage. This effect goes around walls. Half damage on a save.

A creature killed by this spell is totally destroyed and turned into dust alongside gear besides magical items.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d10 for each slot level above 7th.