I've been thinking about the Ruin. Firstly, how did it destroy Earth if it was sealed away? My theory is that the Cultists actually found a way to open a temporary hole in the seal, just enough to get a person in, or a piece of the Ruin out. Think it's possible for a shard of the Ruin to grow and overtake a planet? The second thing is about the holograms at the Ark. This one specifically. Now, when the player reaches the Ruin, it is very clearly a sphere, with its eye at the center. But the hologram shows its eye emerging from an open conic structure. The explanation? The Ruin can open up its entire planetoid body in order to engulf a planet.