Wither Limb

Libris Mortis: The Book of Undead (LM)Supplementals (3.5)
School
Necromancy
Casting Time
1 standard action
Components
V, S
Range
Close (25 ft. + 5 ft./2 levels)
Target
Limbs of one humanoid
Duration
Permanent
Saving Throw
Fortitude negates
Spell Resistance
Yes

The caster chooses to wither either the arms or the legs of a humanoid.
Withered legs force a subject to fall prone while at the same time reducing the subject’s land speed to 5 feet.
Withered arms make it impossible for the subject to use objects or cast spells with somatic components.
A withered limb can be restored by a successful dispel magic cast by a spellcaster of a level higher than the level of the wither limb caster.