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This isn't the first appearance of a dragon in Destiny anyway. In the beta, during the PVP map on Venus, you can clearly see a dragon flying around by zooming in with your sniper. Here's a video of someone doing just that: (keep in mind it's the second creature he zooms into, not the first) - https://www.youtube.com/watch?feature=player_embedded&v=3EtKFYyoOr0#t=0