i always figured that it could prevent B rank NPs just fine, not just attacks.
i mean, Gil's armour takes caliburn just fine and while Karna needed prana burst to take an A+ NP to the face, the Gordes fight also said that Siegfried is more durable than Karna.
and i wouldnt think the story would hype up the Fafnir armour that much, constantly calling him " invincible" and "immortal" if a C rank NP could do the trick. the people he fought in his life would probably be able to kill him rather easily if that was the case
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that is what i figured
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i guess that explains Mozart's NLF.
the power of love...
also Fujino
the power of yandere...