Constantine's Grand Valley of Ruin

You create thousands of red flaming spirit swords of magical dragon bone that float in the sky above you before raining down upon all that is within a diameter of 500ft centered on you. You can force the blades to purposely miss certain targets such as allies or anyone you wish to leave unharmed, but all others will be hit without mercy. Each creature within range must make a Constitution save. On a failed save the falling swords will deal 10d12 fire damage + 10d12 piercing damage, and if the any creature hit with these blades still live after the initial damage they will take an extra 5d6 fire damage at the start of their turns for the next three rounds. They take half damage and do not suffer the burning effect on a successful save. The swords all disappear after 1 minute from the initial casting of the spell.