The Vengeful Hand
From Destinypedia, the Destiny wiki
With enough waves cleared, the Vengeful Hand will spawn within the Ether barrier and start pummeling the player with Arc blasts. There are also more waves of Scorn that will appear. Like any other Abomination, the player will just need to damage it until dead. With the Vengeful Hand dead, the player can move on to the next encounter of the strike.
List of appearances