I have watched 6 seasons of Supernatural, and in almost every one of them, Sam and Dean talks about many different kinds of monsters- with different names, killing-methods and habits.
So I was wondering, is there any credibility to that information? I mean, monsters are not considered real by most people (and most probably they aren't), but I do know there are many myths and legends about them- originating from ancient times. For example, in Supernatural, they almost always use salt to keep monsters away, and also the much-used Devil's Trap.
So is this kind of lore real or just made up for the movie?