What's the benefit of using invented languages in-story?

Question

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?

Answer 1

This alternate language is a hotpot or a ragu of sensory combinations of phonemes from a tower of Babel of Russian, Yiddish, slang, dialects, and Hip-Hop.

Answer 2

This alternate language is a hotpot or a ragu of sensory combinations of phonemes from a tower of Babel of Russian, Yiddish, slang, dialects, and Hip-Hop.

Answer 3

Inventing a new language adds depth to the universe you are creating it allows the reader to be transported and immersed into another reality. The language is used to convey otherworldly and allow the reader to not only feel the character but know their reality.