Cosmic Superbomb

The caster floats into the air, before chanting cryptic words. A massive sphere of flames swirl above the caster's head, before being shot into the air and slowly falling upon 1 target within 150ft. That target and all creatures within 40ft will receive 8d12+20 Fire damage and will all be put prone for a whole round. The orb takes 2 rounds to be fired and a third to land, and enemies can move out of the way.

When used in a 9th level spell slot, the orb grows by a further 25ft and will deal a bonus 5d6+5 Fire damage to all creatures who are prone or incapacitated in the area.