Literally, if they just gave them a different colour I would have been fine. They don't look too different from the Fallen in D1 if i'm going to be honest, and Bungie has already shown they can re-colour the same model.
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If you pay attention to details they are very different from D1 Fallen, very noticeable on Dregs and Captains
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Captains above all else. Kells and archons use to tower over but now they tend to be hunched over