Harmoniya: The Architects way

The astral plane:

It feels like time has passed in a big amount, but in reality no time has passed. River still holds Ira's hand and they feel like they are hovering. "You can open your eyes again , River." River doesn't hesitates and opens their eyes. The first thing River sees is Ira floating with open eyes in front of them. "Don't worry you're safe." Ira's voice echoes through River's head but their mouth isn't moving. River nodes showing their understanding. As they start looking around they notice the unique appearance of the place they are floating in. There is no sun on the horizon but three moons are glomming over them. One is small and looks like a normal moon with a lot of craters on its surface, the second is a slightly bigger and is crimson red, and the last is huge and looks almost normal but has no visible craters. All around are little dots on the horizon, they look like little planets far away. River stares into the distance to the little dots and asks, "Stars or... planets?" Ira looks to River and replies, "No... not really, but it's complicated and a, well, longer story?" River looks up to Ira and nods, "Ah, I understand... can you tell me it eventually?" Ira nods. Rivers mouth forms into a small happy smile.
"But now... Ira. Why did you brought me here? Hows this supposed to help answering my questions?" Ira looks at River and points down, "It won't directly answer your questions but because of that." River looks down and sees an immense and mighty structure. Four big tetragonal shaped pillars with wider parts on top, they are all connected with each others with long connectors. In the middle of the four buildings is another huge building that is chained up to many smaller rocks floating around the structures. All of the buildings look extremely rundown. Thousands of holes are scattered on the surface of the buildings, ivy covers almost everything, the connectors fallen into themselves, and one of the outer buildings crashed into another one. "What is this? It looks majestic," River's eyes widened and their mouth drops open, "It looks like a masterpiece from an Architect!" River looks up to Ira again, "What is that structure?"