Undeath to Death

Necromancy
Level: Cleric/Oracle 6, Inquisitor 6, Sorcerer/Wizard 6
Components: V, S, M/DF (diamond powder worth 500 gp)
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Area: several undead creatures within a 40-ft.-radius burst
Duration: instantaneous
Saving Throw: Will negates
Spell Resistance: yes

This spell functions like circle of death, except that it destroys undead creatures as noted above.