Slay Living(Player's Handbook v.3.5, p. 280)
Level: Cleric 5, Death Master 5, Dread Necromancer 5, Death 5, Abyss 5,
Components: V, S,
Casting Time: 1 standard action
Target: Living creature touched
Saving Throw: Fortitude partial
Spell Resistance: Yes
You can slay any one living creature.
You must succeed on a melee touch attack to touch the subject, and it can avoid death with a successful Fortitude save.
If it succeeds, it instead takes 3d6 points of damage +1 point per caster level.
(Of course, the subject might die from damage even if it succeeds on its save).