MOLE MEN

For starters, their body hair boasted the toughness of metal armor, and it could withstand attacks from metal weapons. Apparently, the resistance was determined by the amount of precious metals eaten during their youth. It could also be ascertained from the color of the fur.

In Yggdrasil terms, these kuagoa probably had a racial skill that protected them from metal weapons. Perhaps it was called something like Metal Weapon Resistance. The question was how resistant. Ainz hardly guessed they could have balance-breaking levels of resistance, but it would be foolish not to confirm.

They had long claws like armadillos or anteaters, and it was said they could pierce steel.

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Volume 11, Chapter 2.2