"Well, there are limitations on where they can get to, depending on how powerful they are... Oh, but not everyone who dies becomes a ghost! Most souls will pass on to re-enter the cycle of reincarnation. It's only those with a particularly strong motivation to stay in the mortal world who become ghosts. Usually it's something like a grudge or the desire for vengeance, but there can be other reasons."

Oops, Xie Lian was rambling a bit, wasn't he. It really was interesting learning about other worlds, though.

"Ah, forgive my rambling. So, am I to understand that the dead pass on to this Underworld, where you're from?"