As we saw at the end Act XII, an Underworld exists somewhere between or beyond the realm of Eden. Quite an organized Underworld, too, complete with wardens, viceroys, and even time limits for those who wander the desolate plains. This brings me to my question.
Just to clarify, does the flow of time in the Underworld match that of Eden's? In other words, does one hour in the Underworld also equal one hour in Eden?