Ray of Exhaustion

(Player's Handbook v.3.5, page 269, DnD 3.5)

Necromancy

Level: ; Sorcerer/Wizard 3; Duskblade 3; Sha'ir 3; Death Master 3; Dread Necromancer 3
Components: V, S, M
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: Ray
Duration: 1 min./level
Saving Throw: Fortitude partial; see text
Spell Resistance: Yes

A black ray projects from your pointing finger.
You must succeed on a ranged touch attack with the ray to strike a target.
The subject is immediately exhausted for the spell's duration.
A successful Fortitude save means the creature is only fatigued.
A character that is already fatigued instead becomes exhausted.
This spell has no effect on a creature that is already exhausted.
Unlike normal exhaustion or fatigue, the effect ends as soon as the spell's duration expires.
Material Component: A drop of sweat.