I came across these today. Would have been cool to have them in the game.
http://xboxclips.com/SINECURE53/a90024f3-1760-4cd6-af3d-15216e0521a3
http://xboxclips.com/SINECURE53/03033793-ff01-4006-bf08-aa6117f8ae02
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Theoretically they are Arhmkara (don't know if I spelled it right) If you wish to learn more go to my name is byf's channel. He did a lore vid about them