[quote=@Cold Hands]

Silver: Is the most lethal substance a hunter can wield. Used in all of his hunting weapons, from their bladed weapons to the flintlock balls. To wolves it singes the skin acting as a burning effect and keeps burning even if the creatures is dead, causing spazams making it more difficult for the beast to function. Vampires it acts much to the same effect but if they've fed it makes them wretch their stomach severely weakening them.

[/quote]

also salt is something that saps strength so that could be something