This item has been deleted from the data source, but is kept here for reference.

TARGET: Frigoris, Exiled Baron

Defeat Frigoris in the "Shrine of Oryx" mission on the Moon with the Heroic modifier active.
Frigoris, an exiled Fallen Baron, has risked an assault on the Hive. It will be risky, but there may never be a better chance -- track him through the Hellmouth and eliminate him.
Added In
Destiny/The Dark Below (2015.05.09)