Apparently they're actually really different. They're more a horribly mutated version of the Fallen, they're much more aggressive and destructive, have different fighting styles, more fighting styles, and are pretty much different in every way other than stealing old tech and being Fallen.
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or bungie would like you to believe. If you could find what they said about the taken or siva i'm sure it was the same line of BS.
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Well I'm going off info on the classes, their fight styles, crit points, and other stuff. Not just marketing claims, actual stats and info.