Idk what the fascination is with High 3-A Re Zero.
Fascination? I'm just scaling the verse via methods I see as perfectly valid.
I mean, Subaru unironically has sub-relativistic reaction speed on the wiki, I'm kinda surprised this seems like such wank.
The top tiers all have hax, including Volcanica which ignores durability, we don't know the process by which the Dragon Sword was made besides being made by anonymous swordsmith and blessed by the Sword God.
Volcanica is just so absurdly powerful that he can effect space due to his raw power, like Reinhard can, like Cecilus can, forget about Reid. It's not intended to be specialized hax, but rather a showing of what god-tiers can be capable of. Reid's ridiculous ability to cut anything literally comes from his "skill", not a hax ability.
This point actually strengthens my argument, it doesn't necessarily contradict it.
Did Volcanica scratch it before or after it was blessed? How did Volcanica scratch it? If it can tank things which even Reinhard can't, ie black hole, how does Reinhard scale to it?
Presumably yes as Volcanica is known to have interacted with Reid who is, as I recall, the aforementioned Sword God. With his claws, Reinhard blatantly said it in the image above. Reinhard would scale to it via scaling to Volcanica's claws. Reinhard also partially tanked the singularity of Al Karum.
The singularly Alter created has no proof of being infinite, its not stated to be infinite, light not escaping etc.
Okay let me explain something about black holes real quick to clear up misconceptions.
A singularity has infinite gravity by definition. This is simply how mass and density work. The reason why a neutron star, despite being so much smaller than the Earth, would nigh-instantly crush you into atoms if you were suddenly teleported to one (not factoring in heat and such), because its mass is much, MUCH higher than the Earth's, that mass is just compressed into a denser radius.
Gravity is the pull on objects with mass between each other, and the more you compress the mass of an object, the denser it becomes; this density causes the molecules of the object to pull even harder on whatever gets close enough to be effected by their gravity. A singularity is a point in which a mass has become SO compressed, it cannot bear the weight of its own gravity, and collapses into a literal singular point in space, something once thought to be impossible.
It has no surface, no width, no depth, etc., it has no dimensions because it is akin to a dot on a paper. That level of density is so extreme that mathematically speaking, the produced gravity around it is infinite, even light cannot escape the radius of its gravity, or rather, the Event Horizon.
The fact that Al created a singularity, which is made abundantly clear by the narrator multiple times, means he in fact created an infinite density, an infinite density which Reinhard endured (his arm was badly damaged but not totally destroyed) and even destroyed with the Dragon Sword which suffered no damage.
It even is described as bending space, as being so dense that it could pull down a star into, guess what, a singular point (the definition of a singularity, a black hole, i.e. infinite gravity). The other points in this discussion are debatable enough that I understand the contention, but not on this. It objectively is a black hole feat.
Reinhard destroying the world is in the same context of Puck freezing it, which he didn't otherwise Reinhard wouldn't have said anything about Felt being sad, she would be dead, and also if you take the IF stories into account, never reached Kararagi, otherwise Rem and Subaru would be dead there too.
This doesn't change the context of what happened. After he destroyed Puck and recreated the world, it became day time, even though it had just become night time at that point prior to his "battle". We don't know the context of Reinhard saying that, it's possible he can bring people back to life with the Dragon Sword, and it is explicitly stated that he did bring the nearby plant-life back from death, so it's just not a strong argument, and the narrator explicitly
exclaims that the world was being entirely destroyed via being frozen over, in addition to Puck corroborating that he can destroy the entire world if he released all of his Mana in Memory Snow, which is blatant foreshadowing for Arc 3. Either way, the notion that the narrator wasn't actually referring to the world it says world like 20 different times, simply because "But Reinhard said" and "In this IF route" is something I heavily, and adamantly disagree with.
Also, depending on which translation you follow, it is also stated that Puck was purged from the
universe.
We could also mention Satella and Reinhard taking 7 days to destroy the world, even if nerfed, infinity divided by a sextillion would still be infinity
AP=/=DC? This is powerscaling 101. Tappei has stated that Reinhard would take as long to destroy his world as it would take Godzilla to destroy Eurasia (though this depends on how strong Tappei thinks Godzilla is), that doesn't change that he can cut space and no-diff Garfiel who performed a bare minimum country level feat.
This just isn't an argument.
We could also go down the rabbit hole of return by deaths mechanics possibly being destroying the world and recreating it, which begs the question, shouldn't it be unaffected by rbd? But so far seems it is.
Should what be unaffected? The Dragon Sword? That's entirely based in conjecture. We have no idea what resistances the Dragon Sword has, what happens to it, etc.. It's entirely possible that it just gets carried along and cleanly put onto the new Reinhard's body. We don't know so this is a somewhat moot point.
It's entirely possible that the reason it can be drawn against Subaru is because it knows about his Authority and maybe could even destroy RBD, it's all speculative.
In short, I think the series still has too many mysteries to be making high end interpretations, even what the world is, is still a mystery at this point.
That's also just not a strong argument, I get why you struggle to agree with high-uni, I don't even personally believe Reinhard has high-uni AP, but personal opinions are irrelevant to the facts portrayed. The Dragon Sword and its scabbard can withstand infinite forces (Strikes carrying infinite energy and the infinite forces applied by a singularity), the claws of a dragon etched marks into the scabbard, Reinhard scales to such a feat simply because of who he is. There are exactly 0 direct anti-feats against Reinhard being able to do this, and in fact, there exists exclusively supportive evidence of it throughout the series.
Objectively speaking, we'd need more evidence to debunk the argument than simply...vibes.