All Shall End in Flames

White-hot fire consumes everything in a cataclysmic sphere of death. The fire fills your choice of a 30-foot area within 500 feet or a 30-foot area. This deals 13d6 fire damage with a reflex save against your class DC. Any creature dropped to 0 HP by this fire dies, reduced to a pile of ash.

If you die to this impulse, you return to life at the start of your next turn in the same space. When you return, you have Hit Points equal to double your level.

Level (20th) The damage is 15d6 fire.