That's the thing. The items that have been found, or so I heard, vary from person to person.

As for why we can't just go back the way we came via the Dream Width, I can't say for sure. Magic hasn't always been my strong suit. Though I wonder if the magic behind it makes it so it's one way. I mean, if we could go back, we would've done so already.

However, after learning about what's going on here and how it would effect our worlds, it's something I couldn't just ignore.