This thread is inspired by another: view original post
The link above goes to Bungie's character development video from the Game Developers Conference. Pause the video around the 24 second mark and you'll see what I'm talking about. This enemy doesn't resemble any enemy I've seen.
I think it's either the "Glimmer" or a different class of the Hive.
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I'm assuming it's a type of cabal that they were in stage of development for. As in they hadn't added all the other things, it's like a shell.