Blood Hunter (4e Feat)
From D&D Wiki
Blood Hunter [Class]
You thirst for the blood of a certain type of creature.
Prerequisite: Ranger, hunter's quarry class feature
Benefit: Choose one of the following origins; Aberrant, Fey, Immortal, Natural, or Shadow. When you deal your hunter's quarry damage against a creature with that origin, you deal an extra +2 damage per die of damage your hunter's quarry deals.