Vampire
In stories, garlic is often used for keeping vampires away, but it does not actually affect them. Vervain is used to hurt vampires, and in Europe, Though this is not traditional, mirrors have been used to make vampires stay away (in some cultures, vampires do not have a reflection and sometimes do not have a shadow, perhaps as a way of showing that they do not have souls). Not all vampires in stories have this quality (the Greek vrykolakas/tympanios had both reflections and shadows), was used by Bram Stoker in Dracula. In addition to this, in Bram Stoker's Dracula, it is mentioned that  wolf's-bane (or  Aconitum) can be used to repel dracula. The reason for this in the novel it is explained dracula is the Wolfman, and can transform into one just as easily as a bat.