Inaccurate?

Wither

(Sandstorm)

Necromancy
Level: Sorcerer 4, Wizard 4,
Components: V, S, M,
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Target: One living creature
Duration: Instantaneous
Saving Throw: Fortitude partial
Spell Resistance: Yes

This spell drains moisture from the body of a living creature.
The target takes 1d6 points of dessication damage per caster level (maximum 10d6) and is dehydrated (see page 15).
A creature that makes a successful Fortitude save takes half damage and is not dehydrated.
A plant or elemental of the water subtype instead takes 1d8 points of dessication damage per caster level (maximum 15d8).
Material Component: A pinch of powdered bone.