Internal Fire

(Complete Arcane, DnD 3.5)

Evocation[Fire]

Level: ; Wu Jen 9
Components: V, S
Casting Time: 1 round
Range: Medium (100 ft. + 10 ft./level)
Target: Up to 1 HD/level of creatures, no two of which can be more than 20 ft. apart
Duration: Instantaneous
Saving Throw: Fortitude partial
Spell Resistance: Yes

This spell creates a deadly raging heat in the internal organs of the targets, causing them to burst into flame from within.
Targets that fail a Fortitude save die instantly.
Those who save successfully take 6d6 points of fire damage +1 point per caster level (maximum +20) instead.
Focus: An iron brazier filled with red-hot charcoal.