the constellations grades changed was a bit different, I still think "narrative grade constellation" sounds better than "fable grade constellation" and it makes it less confusing because every constellation has their own fables, but history grade (translated as great grade in the beginning I think?) fables are weaker than narrative grade ones. Alternatively I think it would be logical to call them "myth grade" because they're all mythical figures of different religions but because I don't speak Korean I don't know the exact word the author uses.