Ashes to Ashes

With an utterance of sacramental discipline, you immolate a target you can see within range in ravening flames. The target must make a Constitution saving throw. On a failed save, it takes 4d6 fire damage, or half as much damage on a successful save. If this damage reduces the target to 0 hit points, ashes descend to cover the ground in a 10-foot radius centered on the target, and each creature in the area takes 2d6 fire damage.