Why does "bloodfeast" work on Calca and Brina, who are essentially robots?
Edge keeps talking about how "history keeps repeating itself"; in fact, one of the major complaints about the game is that so many of its events were directly lifted from Final Fantasy IV. But then, you find out that the crystals were created to record the history of the world they were placed on. And if you talk to the crystals in the Lunarians' Tale, one of them even says, "Its history has been recorded. It must be revealed." So it actually kind of makes sense that everything is happening the way it did before.
If The Creator has been creating and destroying worlds all this time, and the enemies fought near the finale are remnants of those destroyed worlds, and said enemies are from Final Fantasies I, II, III, V, and VI... then did The Creator destroy all those worlds?
In Edward's Challenge Dungeon, you find a NPC called the Adamantine Pig. Later on the dungeon, you are tasked to find it. When you find the Pig you take and give it to the NPC who tasked you with it. When the Pig is taken, another NPC opens the door behind the Quest maker, and prompty makes the Pig follow him. Talking to the other characters mentions that the room you are at is a restaurant. Now you must be thinking that the helpless pig you kidnapped is being turned into food. Too add more Horror, you are forbidden to enter the door where the NPC took the Pig.