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Etherbound Familiar
From Destinypedia, the Destiny wiki
The Etherbound Familiar's are 4 powerful commanders of the Shadow Legion, leading the mercenaries in line with Fikrul, the Fanatic. They are seen leading the Shadow Legion soldiers during the events of Onslaught: Salvation, and act as field commanders for the soldiers tasked with capturing Eliksni civilians with the goal of converting them into Revenant Scorn.
Gameplay
The Etherbound Familiar's are found every 10th wave of the 50 waves of Onslaught: Salvation, acting as bosses leading up to the final wave. Depending on the wave, each boss increases in difficulty, appearing in a random order each run. Eliminating the Familiar's allow the Fireteams to progress further during the Onslaught.