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It looks like there's Fallen architecture mixed with Hive barnacles and crystals. As far as I'm aware, this seems to be the first we've seen of the mixing of two species environments. Judging from the crazy looking Servitor in the next room, perhaps it's a Hive-infected Servitor?

I noticed the hive barnacles & crystals too. I believe we will see the fallen & hive going after each other on the moon (or maybe further out in the solar system between the reef & jupiter?). I'm not so sure about the hive-infected servitor. It looks more super-angry than infected to me.

I think Cayde says the prison of elders is in the reef...maybe the Queen is holding more than just Fallen captive? And hopefully (hopefully) we get some unique models/AI for new enemies.

Edit: damnit, t1g3r. Too fast for me.

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With Cayde-6's quip about the fallen having found the Prison of Elders, I was surprised to see Fallen Architecture. I assumed it was some kind of human prison for captured Fallen. The mixture of Hive barnacles in the image just gives me more questions. Are we going to the prison to stop the Hive? Are they working with the Fallen to release more of the Elders?

It might have been a pre-existing prison or other facility that the queen and her Awoken repurposed into a prison for rebellious or otherwise problematic Fallen, and maybe individuals from other species that caused trouble for the Reef.
It could also be something you encounter on the way to the Prison of Elders. People found a Fallen ship (and a ground facility?) hidden on the Moon some time ago that was supposedly tied to this DLC, that seems like a prime candidate.