The Bloodfiend during the rite of blood and bone
The rite of blood and bone represents an ancient ceremony carried out within the Sith Academy located on Korriban.
To successfully conclude the rite, a student was required to venture into a concealed chamber and retrieve a skull from a collection of bones guarded by shyracks. This bone pile served as an altar dedicated to the Academy's unsuccessful apprentices. Upon obtaining the skull, the student needed to submerge it in a pool of blood. This action would then conjure a mystical entity referred to as the Bloodfiend, which the initiate was obligated to vanquish to demonstrate their value.
Throughout recorded history, numerous Dark Lords engaged in this ritual. During the era of the Cold War, Overseer Ragate held the responsibility of managing and overseeing this age-old ceremony. Both the heir of Aloysius Kallig and the Empire's Wrath had the opportunity to complete the rite successfully under Ragate's supervision.
The execution of this rite formed the basis of the minor Blood Legacy quest featured in the 2011 MMORPG Star Wars: The Old Republic. The game's rating summary from the ESRB specifically mentioned this ritual as a contributing factor to the inclusion of the "blood and gore" content descriptor in its Teen rating.