Beloved of Demons

(Exemplars of Evil, page 23, DnD 3.5)

[Vile]

The tanar'ri reward you with unholy vitality whenever you defeat their enemies.

Prerequisite

Evil, caster level 6th, Knowledge (the planes) 6 ranks, Evil Brand, Power Attack.

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.