From the introduction:
Despite the pervasive history of devils in D&D, there is little in the way of official resources on the details of infernal contracts. There is a wealth of reference material surrounding the lore, hierarchy, and nature of devils, but there’s not much information for DMs and players to create infernal contracts of their own. I wrote D evil’s Advocate: A Guide to Infernal Contracts to remedy t his discrepancy. I hope that once you’ve finished reading t his document, you’ll:
Know some lore surrounding the laws of devils.
Understand the components of an infernal contract and the nuances of constructing an offer.
Have some handy tools for storytelling and role play surrounding bargains and their consequences.
Be able to present a prop infernal contract to your table.