User blog comment:FairyRaven/Fairy Tail Chapter 413: Book of E.N.D., Review and Commentary/@comment-110.20.77.193-20141222214511/@comment-7418318-20141222231322

Maybe if the Dragon Slayer is killed, the connection between the real world and that other place they hid in is lost and they are doomed to forever wander in that Limbo until they die.