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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Saw what I think you're referring to, the large beast that did the ground pound, in the recent Vidoc with the Hive so I'm guessing it's a Hive class.