You point your finger and fire a black ray of negative energy that suppresses the life force of any living creature it strikes. You must make a ranged touch attack to hit. If you hit, the subject gains 1d4 temporary negative levels (see Special Abilities). Negative levels stack.
Assuming the subject survives, it regains lost levels after a number of hours equal to your caster level (maximum 15 hours). Usually, negative levels have a chance of becoming permanent, but the negative levels from enervation don't last long enough to do so.
The number of negative levels inflicted increases to 1d6, and the target is sickened for 24 hours. An undead creature struck by the ray gains 1d6 × 5 temporary hit points for a number of hours equal to your caster level.