Undeath to Death

Player's Handbook v.3.5 (PH)Core (3.5)
School
Necromancy
Casting Time
1 standard action
Components
V, S, M, DF
Range
Medium (100 ft. + 10 ft./level)
Target
1d4 HD/caster level (up to 20d4) of undead creature within 40 ft. of the target
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.

Material Component: The powder of a crushed diamond worth at least 500 gp.