[quote=@HeySeuss]
Yeah, we need to come up with a mechanism to drive the characters back together. Splitting up was a mistake.

Thoughts?
[/quote]

Well, the alternate-reality (illusion?) that they're experiencing could easily bring them together. It was effective at splitting them apart, wasn't it? Perhaps provide some force to drive them towards a central location. It could probably be almost anything. 

But then, I'm not sure what the cause behind their transition between realities was. Maybe whoever/whatever put them there confronts them, or something along those lines?