Board Thread:General Discussion/@comment-81.158.27.48-20151025184237/@comment-27324439-20160108004336

The fact that silver weapons do more damage to undead and werewolves is probably supposed to make it similar to how in earlier games, such monsters had "resistance to common weapons", meaning they couldn't be harmed by anything that wasn't silver or above in material, or enchanted. Also, there's one vampire in Oblivion with an abnormal garlic allergy, showing that TES doesn't always follow real world folklore.