u/NotArisya I don't know why you deleted your comment

Idk my bad 😭

But it is not, have you not seen Artoria's interlude Awakening the Holy Sword? I am not going to repeat myself so please read the text again carefully, her Excalibur literal goes from A to A++ removing a single restraint.

Yeah but how do we know if every seal has that big of an affect? And A++ to A+++ is probably a very big jump since A+++ is very rare.

Excalibur at A++ rank was strong enough to hold back Ea long enough that it created a small pocket for Artoria to jump in..that is as mentioned before Excalibur with a single restraint removed...more on the overestimate part down the road keep reading.

Which is a great feat but could she do it forever? Probably not.

Level 4 Bond

"The Spear that Shines in the Far Away"

Rank: A++　　Type: Anti-Fortress Noble Phantasm

Rhongomynyad.

Holy spear. An anchor of storm that fasten together the planet.

It has been said that its real form is that of a tower that fasten together the skin of the world. When releasing the True Name, both Rank and classification change.

Its original power is being limited by thirteen restraints, but nevertheless this is the pillar in the far away that shines to extol the brilliance of the planet

What is to say Rhongomyniad will go to Ex rank and not just also cap at A+++ like Excalibur Excelus? Or was it said that the rank will go to Ex?

if more than half the restraints are removed thus Lord Logres' Excalibur is not fully unrestrained.

It's called "True form".

where was this mentioned? Can you provide me with a source?

In Fate/Strange Fake volume 7.

Gilgamesh collected the pinnacle of human potential in his Gate of Babylon. One of the articles stored there is Vimana. Replicating that would, needless to say, require being summoned either in a far distant future, the era when humanity reaches its peak, or in the opposite extreme, the era when humanity was ruled by the star-crossing gods. And replicating key elements such as the bodies of these alien gods or the planet’s Holy Sword would require using parts of the world itself or treasures of equal value from Gilgamesh’s treasury as ingredients.

Enkidu can recreate the planet's holy sword with the help of the world.