For those(like myself who don't have dictionaries and who haven't had english classes for a while so only partly remember what a metaphor is..."a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity ." In other words "The Path of Daggers" isn't saying that there is a Path full of daggers. From the definition you can pull your own conclusions. Sorry about the English lesson.