While raging, the barbarian may feast on the organs of her foes and absorb their power.
Once the organ is consumed, the barbarian recovers a number of hit points equal to the Hit Dice of the organ’s owner. In addition, the barbarian gains any energy immunities or resistances the victim had, though the effectiveness of these resistances is halved (for instance, a barbarian who eats the heart of a creature with resist cold 10 would gain resist cold 5; energy immunities are reduced to resist energy 20). This energy resistance lasts for a number of rounds equal to half the Hit Dice of the creature whose organ was consumed.
Pathfinder Player Companion: Demon Hunter’s Handbook © 2013, Paizo Publishing, LLC; Authors: Philip Minchin, F. Wesley Schneider, and Jerome Virnich.