Heart of Fright

Heart of Fright (previously Heart of Evil) is a miscellaneous Legendary crafting material in Diablo III, and can be combined with other demonic body parts to create a ring or amulet of incredible power.

It can stacked up to a maximum of 5000, and is account bound.

Acquisition
Heart of Fright drops from Uber  in the Realm of Fright after using the Infernal Machine of Fright at level 70. Same amount drops for every member of the party.