change_health | Ruby gem for Change Healthcare API | Data Migration library

So before I start this off I would like to give a little disclaimer. I do not really understand what is happening here so I apologize if my paragraph does not make much sense. I will try my best to convey my question, and, hopefully, y'all will be able to help me. So here goes.

I have been working on a basic test based adventure game/dungeon crawler. While creating an encounter method for when you find a monster, I realized that I needed a way to parse through my Hashtables full of my monster classes. Problem was, I had set the keys to Strings for easier access when wanting to add a specific item to the player's storage or to add a specific monster to a fight. So I decided to create a method which would receive a Hashtable I fed it and spit back out a random key, which I would then use to get the monster from my database. I attempted to create a method that would work for all Hashtables with a String, class format, and a sample of my attempted parsing code resides below.