Eye of the risen pheonix

you create a sudden firestorm that forms 30' radius beyond you, out to 100' radius. It lasts just your action, but does 6D6 fire damage to those in the enormous area of effect. The spell will fail if there is insufficient space for the firestorm. You must have a recently dead body as a reagent, who rises from ashes the next round. (With what negative lives until sundown?)