Its really weird to measure, cause the author is inconsistent. Nuclear blast is stated to be one of the highest aoe spells and it can cover a city district, two or three city districts max if comboed with widen and triplicate magic.
Saying that the author contradicts this in a qna after that novel came out where he blatantly states ainz could end an entire country with a single super tier spell.
And thats before you get into weird Damage = aoe arguments that come up because nuclear blast when widened isn't a more powerful explosion, you won't be more damaged by it/theres not technically more power, it simply covers a greater area because thats how the arbitrary rules of magic dictate it work.
Cure elim is still one of the wildest things Ive seen people trying to calc, it's body is made up of 1.2 million zombies, whom are all perfectly preserved due to the way they died (Mass soul suck) Only 400,000 of which were humans.
Well, we don't work that way, we go with feats > statements unless those statements collaborate with the feats.
The author's words means piss until that point(Which is why we tend to dumpster everything Meyer states post Twilight).
. . . Ciel wank.
Unironically, Calvaria Star is absolutely bullshit(A genuinely Excalibur-Tier attack) and could potentially kill even a Grand Servant... the problem is that unless you prep Ciel already to use the son of a bitch, it's practically impossible for her to use it in a battle scenario(Since she needs to ingest atleast 1 Idea Blood) and like it's stated at the end, it's more of a Heavenly Guillotine than anything like Excalibur meaning it can somehow miss despite the attack radius easily coming in further than a City Block.
EDIT: Had to change some stuff around and also point out it has a 3 Minute Charge Time... jesus.