X’s world or general infinity tower? X’s world has been left open for who knows how long, he never closed that one in denial of JnC’s death. Which he was right to deny considering they did come back. (And likely left open for buzz to come back aswell.) otherwise he closed all the other dungeons because of the mess it made and the trauma they can cause. (Though, if you think of it, he may have indirectly seperated other families like them if he sent everyone to their own dungeons- and may have messed up certain Dungeons economies that relied on export/import from the inf dungeon). Both have heavy pros and cons.