The idea that silver is needed to kill a werewolf originates from European folklore, where silver was believed to have supernatural properties. According to legend, silver was thought to be able to repel evil spirits and was also associated with the moon, which was often seen as a symbol of purity. In werewolf stories, silver was said to be the only metal that could penetrate a werewolf's tough hide and kill the beast from within. Over time, the idea of silver being effective against werewolves became a popular trope in popular culture and is often depicted in movies and television shows about werewolves.
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