Caloriclasm

School Evocation [Fire]
Tier Sorcerer/Wizard ?
CASTING
Casting Time 1 Standard action
Components V,S
EFFECT
Range ?
Area Two 10-ft cubes/level
Duration 4 rounds
Saving Throw Fortitude half, See text; Spell Resistance Yes
DESCRIPTION
The air above your enemies' heads shimmers as streams of their body heat swirl into the air, coalescing into a glowing sphere. Soon, once enough energy is condensed, you will release its energy in a spectacular explosion of flame.
Caloriclasm slowly saps the heat out of everything in the area, condensing it into a singularity that eventually detonates in a ball of fire. Each round for three rounds, Caloriclasm deals 4d6 nonlethal cold damage to everything beginning its turn in the area, creating a running total of damage that the spell has dealt. Additionally, each round each affected creature must make a Fortitude save for half damage and to resist becoming Fatigued. Creatures with the Cold subtype are immune to the nonlethal damage and Fatigue, however. On the fourth turn, the singularity bursts, dealing the running total of damage as fire damage to each creature in the area unless they make a Reflex save for half.