Dramatis Personae: Fiend Patrons includes:
20 Variant Fiend class features! Customize your warlock of the Fiend to represent a specific Archfevil, Demon Lord, or Yugoloth. Each Fiend is different, and so are they warlocks!
Each Fiend patron includes an additional feature, to update the original subclass to the number of features presented on Xanathar's Guide to Everything. These new features add versatility and the chance to show off which Fiend gave you power.
Each Fiend has replacement and enhancement features that work similarly to the variant class features in Unearthed Arcana. This allows each Fiend warlock to work differently.
Some canonical lore of the Fiends featured on this title.
New Demonic Tieflings, based on the Infernal Tieflings presented on Mordenkainen's Tome of Foes.
- from the publisher's blurb