[quote]New question; are these locations all supposed to be based on a PC's mind? Or could it also be someone random? I figure if it's a PC's location, then that PC would probably have to be the one to handle how the encounter plays out.[/quote]

They're based on the dreamers' psyche, but if it's too hard for us to investigate each others' self-made dungeons, we can always base these dungeons on random people. The museum that Hez and Lin manage could have artifacts based on these random people.

I had a brainstorm this morning that some dreamers do manifest in Vivi-Dream, but only as bad locations and not as Oneiros. For some reason, they aren't able to manifest as Oneiros. This can help us create dungeons without restricting each other, as well as explain the in-story influx of negative locations and monsters - because there are too many people in Vivi-Dream creating bad locations, and a critical shortage of Oneiros to deal with them.