Skolas? He is seen 3 times, but that first mission he is barely seen, so he could be but twice. Death follows him on tarnished wings? Yes, in the form of old reef ships chasing him or time worn fallen ships due to vex tech. In PoE, he doesn't choose when to appear, Variks does. Variks is a teacher and a scribe for house judgement as per lore, and the other could be seen as Petra. Petra is a student and disciple of the Queen, and her hatred is a raging fire whereas Variks is simply kindling, a rage that he suppresses through challenges such as PoE but could erupt given a spark. Who will have the final say I shall determine could refer to the queen overruling Petra on taking skolas in alive, and skolas determined that by his display of cunning. Lastly, the last sentence is the description for Gally, which would have been the HoW raid weapon, gained from defeating Skolas. So my answer is Skolas