Beloved of Demons( Exemplars of Evil, p. 23)
The tanar'ri reward you with unholy vitality whenever you defeat their enemies.
Evil, caster level 6th, Knowledge (the planes) 6 ranks, Evil Brand, Power Attack.,
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.