Ephemeral Storm

Master/breath of twilight
Level/School: 9/evocation
Range: close (25 ft. + 5 ft./2 levels)
Target: one living creature/2 levels, no two of which are more than 20 ft. apart
Duration: instantaneous
Saving Throw: Fortitude partial
Spell Resistance: yes

The air explodes with shadowy tendrils that slice like blades.

Targets of ephemeral storm must make a Fortitude save or die. Those who succeed take 5d6 points of damage.