You guys are by far the best in the whole world for me!!! I have a theory and it explains in the description that it's a nightmare Noctis is having as well as an omen King Regis receives about a very catastrophic future that he's trying to prevent. I think it's either an evil entity or Chaos trying to corrupt Noct to kill Luna and destroy the world. To boost up your theory this game is based off FF,FF4, and FF6, all the ideas came from those games so maybe nova crystallis is a thing and also chaos is the one pulling the strings of the cursed Lucius bloodlines.
Love it! Keep touching on the theory! I also think the crystal is evil and has evil tendencies that has cursed the Lucian bloodline.
The crystal is chaos ; Buy FFXIV Gil ) and the former kings have kept it in check for a balance of peace, but regis wants to end the bloodshed by ending the cycle, thus instead of sending noctis out by himself instead he sends him with friends to prevent that possible future, noctis may still get possessed but with the help of his friends that can be avoided, and maybe by doing this will anger chaos and he will see that eos burns for breaking that balance, then it leads up to noctis and his friends to destroy chaos, so that way the curse will end.