There is no scaling to be had here because both Siegfried and Balmung get a power boost against dragons, and there is no evidence that regular Excalibur as used by Saber Artoria is as strong or stronger than Balmung in that state. Destroy an entire country not with a single breath, but by...
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Oh great, it's fucking GaRbs again with his absolutely terrible take after someone goes above and beyond to collect high end feats from the various FGO media:
There is no scaling to be had here because both Siegfried and Balmung get a power boost against dragons, and there is no evidence that regular Excalibur as used by Saber Artoria is as strong or stronger than Balmung in that state.
Artoria fought the White Dragon Vortigern who is basically around the same tier as Oberon Vortigern... both are beyond Fafnir's wheelhouse.
Excalibur is canonically stronger than Balmung even against Dragons considering a 6 seal version is equal to a 6th seal Rhongomyniad which basically shits all over most NPs...
Destroy an entire country not with a single breath, but by spreading that much damage through a whole army.
Literally ignored what the dude put up for his own stupid interpretation:
...According to a certain rulebook, a breath's damage value is equal to the dragon's health value. If you consider health value far surpassing that of humans inflicting damage spread all over an entire army, a single dragon destroying an entire country seems like a reasonable story. How is this somehow complicated for GaRbs to not get? How is this complicated for anyone to not understand?
A Dragon's Breath = Their Health. Their Health >>>> an entire Army of well trained humans = A Country = They can destroy an entire Country due to that.
No wonder these people have issues with basic shit when this is the best defense they have.
No evidence that Jalter's NP is as strong as Fafnir's breath. We have no idea of what this "first-rate dragon's breath" refers to.
Ah so her Materials is a lie... based on what?
La Grondement Du Haine: Howl Loudly, O’ Rage of Mine
Rank: A+
Classification: Anti-Army Noble Phantasm
Range: 1~10
Maximum Number of Targets: 100 people
La Grondement Du Haine (The Roar of Hatred). The cursed flag possessed by the Jeanne who descended as the Dragon Witch. It stops the enemy’s attack in the same way as Saint Jeanne’s Noble Phantasm, but this Noble Phantasm also swells up that attack, before it reflects it back. Also, its power will increase even more if her allies die, etc. Then, whether it is a slashing attack, a striking attack, or on top of that, a hit by means of a curse, all of it will in the same way be converted into her physical attack power when they are halted by the Noble Phantasm.
The flag can release flames with performance resembling a first-rate Dragon Breath. Furthermore, the stake was stuck into Jeanne Alter’s image. Personally for her, “I was attached to… uh, something jagged… and made of steel, and a harsh impression of it remains with me!”, and this impression allows her to create those kinds of stakes in her image for her own use.
I mean it's not like Artoria Alter sees Jeanne D'Arc Alter as a major rival or anything like that due to the precise reason of seeing her as a worthy foe or anything... oh wait.
No evidence that Excalibur scales to that. Moreover, Ishtar was planning on having the entirety of Gugalanna do that, not just its hooves. The NP that only utilizes his hooves is only compared to a meteor strike in power, which is not enough to destroy an entire country.
How the fuck doesn't Excalibur scale to Gugulanna's Stomp when it was able to go against Dendera Light Bulb and not be instantly destroyed when it would have vaped Japan, which is almost the size of California?! Or the superior to Rhongomyniad, which defeated Animus Animusphere which is the reason Lostbelt Zeus sees Wodime as an equal?! Or destroying Grail Mud which requires Continental-Planetary levels of destruction to destroy?
Ibuki-douji's A+ Rank Noble Phantasm can blow away eight valleys and create eight large rivers with a single swing, using only a fraction of the sword's actual power:
No evidence that Excalibur scales to that.
Have I mentioned GaRbs is a dumbfuck today? Because I feel I haven't mentioned GaRbs is a major dumb fuck. Because how does Excalibur not scale to a fraction of Ibuki's NP when it was able to literally destroy Grail Mud? Which would require Continental-Planetary levels of destruction to destroy?
That is the Lion King, Goddess Rhongomyniad, not Lancer Artoria. They are explicitly stated multiple times as not being the same.
Have I yet to mention GaRbs is a dumb fuck? Because that was only stated that Goddess Rhongomyniad and Lancer Artoria are not the same being, it doesn't mean they don't have the same powerset... BECAUSE THEY EXPLICITLY DO!
Summer 4 literally has her do the same shit that the Lion King did right down to recreating Las Vegas with her own power with no Grail needed and even use Gifts to do so! The only reason she even lost to Romulus in her Interlude was not using the full power of the lance as she can either go full Goddess... or release more Seals, that's it(and it's not like Romulus himself isn't major bullshit anyway even before Quirinus right...)
There is no evidence that those beams of light are light speed.
This is probably the only thing he got right thus far... too fucking bad that Archimedes basically proves that wrong anyway:
Literally redirecting his mirrors that are deflecting Sunlight... which heavily implies Holmes' Magnifying Glasses work on the same principle.
Aim dodging is a thing, which does not require one to move as fast as the projectiles one dodges.
Okay GaRbs, you can now officially aimdodge LIGHT-FUCKING-SPEED. The doors you have opened, I will use against you and SB for the rest of time and I hope people keep this in mind from now on too, including Guests that come here often:
You can officially aimdodge Lightspeed attacks.
Antares Snipe is shot from a conceptual materialization of the Sagittarius constellation, not the real one.
Um GaRbs, you screwed up again mate:
Antares Snipe. Archer of Black’s trump card, a sniping Noble Phantasm that shoots a shining star. It is a conceptual materialization of the Sagittarius constellation, but it is not as if it cannot activate without the constellation present. IT'S IN THE SAME FUCKING LINE, YOU FUCKING IDIOT! And again, it's materializing the Constellation, it's not creating the Stars in the goddamned sky you mong! If that was the case, it would be nowhere near as broken as it is in fucking lore! Especially when it comes to this line here:
However, it can only shoot once every night. If it can only be shot ONCE AT NIGHT, then how in the fuck does it matter since he can literally just will the stars into existence then?! Oh right, GaRbs is a fucking idiot.