Ray of Exhaustion

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 also 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.