What's the benefit of using invented languages in-story?
I'm working on a fictional story set in a fantastical (although coherent) universe. I'm used to seeing invented languages in works like this: Tolkien's languages for The Lord of the Rings, or Paolini's languages for his Inheritance Trilogy.So, they *are* pretty and all that, but why would I want to use them? Or even better: What would you use them for? What's the benefit of actually inventing the language and writing (dialogs) in that language as opposed of simply specifying it exists and letting people know when it's being used?