I'm thankful that someone finally comes with more serious critique, since this means that I can finally really improve the idea, I'm really glad there's something as simple as sprites and tiering though.
I'm SO glad my suspicions were confirmed that Terra Blade actually IS based on Excal+Night, I felt like it but I didn't really see it. Now that I do I have a MUCH clearer image of how these other swords would look! Not only that, but in the end it actually strengthens the foundation of the entire suggestion, because forging together a potential crimson-sword with excal would be just as silly as when making the wrong evil sword after all! I'll get to work on the new sprites right away!
But depending on how these other swords will actually look, I may hold off on taking to heart the critique against Ria, personally I feel that something else than merely a combination of the 3 feels justifiable, but wait on making the final decision until after having done the Terra-tier.
The one problem that I may have to bring up with
@Zoomo is the sprite for Wrath of The Gods though, since without a canonical sprite I couldn't possibly make a combined sword from them.
Another fun fact is the name. Up until when I first called its name on my profile I had actually thought of calling it True Terra Blade, but after seeing someone suggesting that, and realizing how bad that name really was, I sat down and juggled names with a friend of mine, he actually came up with it jokingly, but I realized that Ria was exactly the kind of name to expect of a "real" final tier, one that comes after Terra without breaking patterns!
Regarding the tiering: I have never actually gotten as far in a playthrough as to beat Duke yet, my friends and I simply haven't gotten around to it, so your judgement is better than mine, I'd like some other's confirmation on this though.