(at 4:40)
"He was a Titan."
"He's a Hunter."
"He was a Titan but became a Hunter as Dredgen Yor."
"He wasn't any class."
I'm well aware of the debate over whether Azzir/Yor was a Titan or a Hunter. And that lately, people are leaning to the idea of him being a Titan... that might change now...
So as we should all know the subclass missions feature narrated lore straight from the Grimoire that have some connection to the subclass you're trying to get. In the Nightstalker mission, one of the "weird stories" told by Cayde alluded to Rezyl Azzir (time stamp shown above). Now Cayde is not much of a Nightstalker as he prefers his Golden Gun, so the Nightstalker connection isn't him. So perhaps Rezyl Azzir was in fact a Nightstalker? I get that there's evidence of him being a Titan; I just find it strange that the Hunter Vanguard is telling the story of a supposed Titan in a Nightstalker focused mission... unless he never was a Titan to begin with.
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His card calls him a Titan: http://www.ishtar-collective.net/cards/legends-and-mysteries-rezyl-azzir?highlight=Rezyl So I mean that doesn't leave much room for debate as to his class. I should also refer to Felwinter:http://www.ishtar-collective.net/cards/lord-felwinter?highlight=Felwinter+ Cross classing, one class using another's abilities, could explain it. Another reason could be that as Rezyl was the first legendary Guardian he nurtured the growth of abilities during that time. Also I'd say the dialogue of Cayde on the mission doesn't imply anything by itself. The setting does. Likewise the second tale of the Baroness has nothing to do with Nightstalker. That's just a random memory that could apply to any Guardian. Not real sure what that dialogue was about. My Titan had relevant dialogue, this doesn't seem relevant at all.