Ok I'd say quite a few people have these two shaders but idk which one I should rock.
I'm leaning towards blacksmith because I don't like how sunsetting has the black helmet along with a black cloak.
As far as rarity, I've personally only seen two people in the tower with blacksmith and I've seen around six with sunsetting.
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I've got Sunsetting on my Titan with full Crota gear. Looks pretty badass IMO.