Monsters
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Fun fact: Silver didn't tarnish until after the industrial revolution. Trains dumped enough sulfur into the atmosphere to cause tarnishing as a widespread phenomenon. Before that Silver was one of the mithreal metals that did not corrode. I have heard it explained that the purity of mithreal metals drives away evil. Of course if you get into Indian mythology, silver is associated with the sixth chakra.
Why it takes silver to kill a werewolf