Enervation

Source enervation

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.

Augmented (3rd): If you expend two uses of mythic power, any creature attempting to remove the target's negative levels must succeed at a caster level check (DC 10 + your caster level + your tier).