Cremate

A searing blast of red flames erupts from a point within range, nearly scorching yourself as well. Each creature within a 45-foot radius of that point must make a dexterity saving throw. A creature takes 15d4 fire damage on a failed save, or half as much damage on a succesful one. The caster also takes 1d12 fire damage

The fire spreads around corners. It ignites flammable Objects in the area that aren't being worn or carried, even dense or particularily resilient material.

Non-flammable objects in the area that aren’t being worn or carried, also take fire damage, but are considered resistant, only take 10d4 fire damage, and do not catch flame (though they might break or collapse)

A creature killed by this spell and is reduced to ash.