Beloved of Demons

Prerequisite(s): Evil Brand, Power Attack, Evil, Caster level 6+, Knowledge (the Planes) 6+ ranks.
Benefit: Whenever you strike a lawful or good creature and reduce it to the dying or dead condition, you gain a number of temporary hit points equal to 1/2 your class level. Temporary hit points gained from this feat disappear after 1 minute. As an immediate action, you can sacrifice up to 5 temporary hit points to gain damage reduction 5/good for 1 round.
Source: Exemplars of Evil