You can consume the soul of a dying creature to heal the unholy.
Prerequisites: Channel negative energy 2d6, evil alignment.
Benefits: Whenever you make a coup de grace against a living creature, you can spend one use of your channel negative energy class feature as a swift action. If the creature dies and has at least as many Hit Dice as the number of dice you roll for channel negative energy, the channel heals all evil creatures (living and undead) within a 30- foot burst instead of its normal effect. If the creature does not have enough Hit Dice, the channel energy attempt is wasted.
Way of the Wicked Book Five — The Devil My Only Master. Copyright 2012, Fire Mountain Games LLC; Author: Gary McBride.