The scrolls I had picked details an agreement with Ve'nya and the creature named Murgoolsh.  Murgoolsh is a lesser demon from the dark plane in another dimension. Nevertheless, he has the knowledge that is out of this world. Seemed like he had struck a deal to give Ve'nya the recipe to create a crystal of immense power, in return for its freedom. The agreements says that Ve'nya will free Murgoolsh after he has validated the recipe's authenticity, but Ve'nya passed away before he could accomplish his mission, and Murgoolsh was left in the prison forgotten. The words that were scratched across the wall says 'Revenge will be mine'. I'll introduce you to my collegue Dex'tre at Actzen . Go see him , when you are stronger, and he will help us to solve the mystery of Murgoolsh.