@12cheeper
I played Fire Emblem Gaiden as well, haven't played the remake Ehcoes though. It's true that Naga isn't mentioned in Gaiden, but there's also no proof that Duma created the Falchion. And maybe the information about Naga disputing with Duma came from the guidebooks; I know that's generally secondary canon, but alot of old video games especially have that as their only in depth detail about the lore. And once again, I haven't played Echoes, but their could be information there about Valentian Falchion being one of Naga's fangs. Also, it's preferably not to argue which wikia is more accurate than the other, but I personally think it's a good idea to take a look at all sides.
And as for Grima's case, his size looks country level or at least Large Island level if you ask me. Plus he has shook Ylisse; roughly 1/3rd of a continent, so Country level is perfectly reasonable. More importantly, it's not very nice to assume that other people have not played the game or to be so quick to call someone biased towards their verse. I have no intention of coming out as rude myself, but that tone needs to be toned down a bit; Thank you.