I have issues with “big, bad dragon/demon” that have plagued many games in this series, but I agree with most points stated. I find the biggest issue being the trivialization of all other villains/cults leading up to the end. They are simply devices that get used by the final big baddie.
I’ll get blasted on this site for this, but Zephiel is the biggest culprit. He’s a twerp with daddy issues who goes for the old “this world is imperfect” pitch, and when Idunn is awakened, her lore completely overshadows him. He is a tool.
Ashnard is similar, however to his credit, despite Radiant Dawn’s character assassination of him, he had an end goal in mind and ideals that could be understood to some extent in PoR.
Lyon was a literal tool, though I give him props for staying dead in the end. It was impossible to ever take him seriously, as you knew the Demon King was the driving force.
However, I will die on the Nergal hill. He a puppet to no one but himself and has lore that is foreshadowed, but not outright given unless certain restrictions are met. His goal isn’t to take over the world like every other cliche villain. He wants/needs power, to fuel both his dark magic obsession and to open the dragon’s gate to get back to his wife - a goal he has forgotten due to his dark magic descent and age.
He is dealing with “technology” that is explicitly explained to be ancient/powerful/bad news, etc. The only issue is the way he goes about getting power. Nergal has ties to current characters (Black Fang, Elbert, Laus, etc) and ancient characters (Athos, his wife, Arcadia), and is the overarching villain for the entirety of Fe7’s wonky main storyline.
I will argue the Ninian revival point due to the several other boundary breaking elements in 7, which are all fine imo. Athos & Nergal are centuries old with no explanation (doesn’t need one - akin to Gandalf in Tolkein, it provides these characters strength and mystery w/o outright saying “I am strong”.) Nergal is able to suck energy out of people and mold animated humanoids with said energy through dark magic. Bramimond is also a dark magic user, even more experienced than Nergal, so much so that his physical being is completely screwy. So by the time Ninian is revived, we know that the ancient heroes are FU powerful, life/death is able to be manipulated through dark magic, and that there are many things existing that purposely defy the normal logic set up. Ninian/Nils being dragons the entire time acts as an additional point.
I also agree that “magical miracles” are lousy unless they are set up correctly or foreshadowed as being somewhat possible.