Due to the alternate space where the Black Stone Throne was, the flow of time was much slower than in the main world. So even though Roy and Julia had been outside for more than three years, it had not been that long for Lilith. From her perspective, Roy and Julia had only left for a few
Because of the slow flow of time, the massive Void vortex in the sky could not devour this alternate space so quickly.
However, when Roy returned, he still found that the devouring of this world was becoming much more serious. Even the top of the Black Stone Castle, where Lilith was at, had a small part missing since the last time he saw it, all turning into fragments that were attracted by the massive vortex. Comparing the last time he was here and this time, Roy calculated that perhaps in another four to five years, the Black Stone Castle would completely disappear.
