Originally Posted by
fumei
Not sure if this is what you're referring to, but it's a plot point that while those born in a Lostbelt cannot leave it/live in PHH, since this is no longer a lostbelt but a singularity/a "reality" on par with PHH, it means those born here now can emigrate to PHH. Basically, as long as they can get past the light wall, they can survive the inevitable fall of this alternate wall. When we strike the deal for Barghest to side with us in Camelot, her condition is that we do all we can to get at least some people out when the time comes (tho da vinci mentions that we can only carry like 500 people in the border).