Deafening: The Things that Mute Magic

What are the things in this world that dissipate the effects of the monsters?

• Garlic for vampires: not that they're necessarily going to die from exposure, but it renders them unable to do the stuff they normally do; you can eat pizza, but then you can't turn into a bat for the next day
• Wolfsbane is a classic choice for werewolves
• Mermaids versus wasabi and other horseradish dishes
• These are all food so far, what am I doing?
• Runes are a thing, so there's gotta be a particular basic symbol that neutralizes others, or that introducing it will supersede existing elements
• A particular potion you can splash someone with to negate most magical effects (including a vampire's compulsion or a siren's song or something like that)