Undead? I don’t think silver has any effect on the undead, it only works against werewolves (or werecreatures if you want to be progressive) and similar mutant creatures in most fantasy settings - unless we assume the world to operate under the rules of The Witcher books, in which silver harms all magical creatures.
Silver has been considered effective against all kinds of supernatural threats by different cultures in different ways. I would imagine the Witcher’s lore was influenced by one of these traditions. As the link indicates, it’s a pretty common trope.
Undead? I don’t think silver has any effect on the undead, it only works against werewolves (or werecreatures if you want to be progressive) and similar mutant creatures in most fantasy settings - unless we assume the world to operate under the rules of The Witcher books, in which silver harms all magical creatures.
Silver has been considered effective against all kinds of supernatural threats by different cultures in different ways. I would imagine the Witcher’s lore was influenced by one of these traditions. As the link indicates, it’s a pretty common trope.