MS says basically the sentence is a) written by someone who has a reputation for writing odd sentences, and b) the use of 銘 (signature/maker's mark/engraving) renders the sentence somewhat inscrutable. Fans of the game have suggested that 銘 is mistakenly used as the name of the actual weapon (and not as the creator's signature, as should be the case). MS comments that even if that were the case the sentence itself would still be incomprehensible. He suggests to just skip over it as something vaguely cool-sounding, but without real meaning.
I have no idea of the context of the game, and characters, so I submit this with zero confidence:
This armor (suit of armor) is the last remnants of an ideal held by those whose names are forgotten, and who have given up their weapons/signatures?