Death by Thorns
The caster causes thorns to sprout from the insides of the subject creatures, which writhe in agony for 1d4 rounds, incapacitated, before dying.
Book of Vile Darkness 3.5
By Monte Cook
Conjuration (Creation) [Death, Evil]
Level: Corrupt 7
Components: V, S, Corrupt,
Casting Time: 1 action
Target: Up to three creatures, no two of which can be more than 15 ft. apart
Saving Throw: Fortitude partial
Spell Resistance: Yes
Creatures that succeed at their Fortitude saving throws are still incapacitated for 1d4 rounds in horrible agony, taking 1d6 points of damage per round.
At the end of the agony, however, the thorns disappear.
Corruption Cost: 1d3 points of Wisdom drain.